EP0163633A4 - PROCEDE DE PREPARATION DE PHENOLS DE p-ALCENYLE ET LEUR OXYDATION ULTERIEURE FORMANT DES BENZALDEHYDES SUBSTITUES. - Google Patents

PROCEDE DE PREPARATION DE PHENOLS DE p-ALCENYLE ET LEUR OXYDATION ULTERIEURE FORMANT DES BENZALDEHYDES SUBSTITUES.

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Publication number
EP0163633A4
EP0163633A4 EP19840900176 EP84900176A EP0163633A4 EP 0163633 A4 EP0163633 A4 EP 0163633A4 EP 19840900176 EP19840900176 EP 19840900176 EP 84900176 A EP84900176 A EP 84900176A EP 0163633 A4 EP0163633 A4 EP 0163633A4
Authority
EP
European Patent Office
Prior art keywords
hydrocarbyl
reaction
substituted
solvent
ethene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19840900176
Other languages
German (de)
English (en)
Other versions
EP0163633A1 (fr
Inventor
Charles Ray Everly
Jerry Monroe Roper
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ethyl Corp
Original Assignee
Ethyl Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ethyl Corp filed Critical Ethyl Corp
Publication of EP0163633A1 publication Critical patent/EP0163633A1/fr
Publication of EP0163633A4 publication Critical patent/EP0163633A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C47/00—Compounds having —CHO groups
    • C07C47/52—Compounds having —CHO groups bound to carbon atoms of six—membered aromatic rings
    • C07C47/56—Compounds having —CHO groups bound to carbon atoms of six—membered aromatic rings containing hydroxy groups
    • C07C47/565—Compounds having —CHO groups bound to carbon atoms of six—membered aromatic rings containing hydroxy groups all hydroxy groups bound to the ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C37/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring
    • C07C37/11—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by reactions increasing the number of carbon atoms
    • C07C37/20—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom of a six-membered aromatic ring by reactions increasing the number of carbon atoms using aldehydes or ketones
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/27—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation
    • C07C45/32—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen
    • C07C45/37—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups
    • C07C45/38—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by oxidation with molecular oxygen of >C—O—functional groups to >C=O groups being a primary hydroxyl group

Definitions

  • This invention relates to a novel process for the preparation of p-alkenyl phenols and the subsequent preparation of the corresponding substituted benzaldehydes. More particularly, this invention relates to a novel process for the preparation of 1,1-hydrocarbyl-substituted-2-(3'-hydrocarbyl or 3',5'-dihydrocarby1-4'-hydroxyphenyl)-ethene compounds which are especially useful as interediates in the preparation of phenolic antioxidants for gasoline, lubricants, plastics and rubber.
  • an alkylated phenol having a replaceable hydrogen atom at the 4- position and at least one hydrocarbyl substituent ortho to the hydroxyl group is reacted with an aliphatic aldehyde having two carbon atoms up to at least 20 carbon atoms in the molecule and a secondary amine to form the corresponding 1,1-hydrocarbylsubstituted-2-(3'-hydrocarbyl- or 3',5'-dihydro-carbyl-4'-hydroxyphenyl)-ethene.
  • the invention can best be understood by the following detailed discussion of the reactants and conditions by which the p-alkenyl phenol products of the present process are produced. The structure of these products will, of course, be determined by the nature of the starting phenolic and aldehyde reactants.
  • any monohydroxybenzene compound having a replaceable hydrogen atom on the ring carbon atom para to the hydroxyl substituent and at least one hydrocarbyl substituent ortho to the hydroxyl group will serve as the starting phenol.
  • the hydrocarbyl substituents be alkyl, aralkyl or cycloalkyl groups sufficiently large to offer some degree of hindrance to the phenolic group.
  • the hydrocarbyl substituent be branched on the alpha-carbon atom and have at least 3 carbon atoms and, preferably, up to 8 carbon atoms; although any number of carbon atoms, for example up to about 40 carbon atoms, may be present in the hydrocarbyl substituent as long as the substituents do not interfere with the formation of the desired phenolic styrene.
  • Suitable o-hydrocarbyl phenols meeting these requirements include secondary alkyl-substituted phenols such as o-isopropyl phenol, o-sec-butyl phenol, o-sec-amyl phenol and o-cyclohexyl phenol; while suitable tertiary hydrocarbyl phenols are o-tert-butyl phenol and o-tert- amyl phenol. Additionally, primary hydrocarbyl phenols, such as o-benzylphenol, can serve as starting phenols.
  • phenolic reactants in the process of this invention are dialkyl phenols wherein the phenol has a replaceable hydrogen atom on the para ring carbon atom and two hydrocarbyl substituents ortho to the hydroxyl group.
  • the hydrocarbyl substituents is branched on the alpha-carbon atom and has from 3 to 8 carbon atoms. The substituents need not both be the same hydrocarbyl radical.
  • phenols are represented by 2,6-dimethyl phenol, 2, 6-di-n-butyl phenol, 2,6-di-sec-butyl phenol, 2-isopropyl-6-methyl phenol, 2, 6-diisopropyl phenol, 2, 6-di-tert-butyl phenol, 2,6-di-sec-octyl phenol, 2-methyl-6-cyclohexyl phenol, 2,6-di-(alpha-methylbenzyl)phenol, 2,6-dibenzyl phenol, 2-methyl-6-benzyl phenol and the like.
  • a particularly preferred phenolic reactant for use in the present process is 2,6-di-tert-butyl phenol.
  • Substituent groups other than those previously listed such as aryl, chlorine, bromine, fluorine and nitro groups and the like may be present at any of the ring carbon atoms with the sole exception of the para ring carbon atom in the aromatic phenolic reactant provided they do not adversely affect the formation of the desired 1,1-hydrocarbyl-substituted-2-(3'-hydrocarbyl or 3',5'-dihydrocarbyl-4'-hydroxyphenyl)ethene product.
  • R 1 and R 2 are the same or different and are hydrogen or hydrocarbyl radicals, preferably alkyl, aralkyl or cycloalkyl radicals having up to at least 40 carbon atoms, and preferably from 3 to 8 carbon atoms, at least one of which is branched on the alpha-carbon atom with the provision that at least one of R 1 or R 2 must be other than hydrogen.
  • Aldehydes which are applicable to the present process are those aldehydes having a single aldehyde radical of the general formula
  • R 3 and R 4 can be the same or different and are selected from hydrogen or linear and branched alkyl radicals having up to at least 40 carbon atoms, preferably up to 20 carbon atoms.
  • Typical aldehydes which may be used in the process of the invention include, by way of example only, acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, caprylaldehyde, decylaldehyde, tetradecylaldehyde, and the like.
  • Amine reactants which are applicable to the present process are secondary amines; that is, derivatives of ammonia having one hydrogen atom bonded to the amino nitrogen atom and can be represented by the formula
  • R 5 and R 6 are the same or different and are linear or branched alkyl radicals having up to at least 40 carbon atoms. It is deemed, however, that secondary amines containing nitrogen atoms in a ring structure such as piperidine, pyrrolidine, morpholine and the like also may be used. Preferred amines are dimethylamine, diethylamine, dipropylamine, dibutylamine, disecondary propylamine, ethylinethylamine, methylpropylamine, methyl-n-butylamine, ethylisopropylamine and the like.
  • the amino reactant initially combines with the phenolic and aldehyde reactants to yield a Mannich base type of intermediate which upon further reaction spontaneously eliminates the amine component to produce the olefinic final product.
  • the carbonyl carbon atom of the aldehyde reactant along with the organic groups bonded to the carbonyl carbon atom of the aldehyde, becomes bonded to the 4-carbon atom of the phenol ring.
  • R 1 and R 2 are the same or different and are hydrogen or hydrocarbyl radicals selected from the group consisting of alkyl, aralkyl or cycloalkyl radicals having up to at least 40 carbon atoms with the provision that at least one of the R 1 or R 2 radicals must be other than hydrogen and R 3 and R 4 are the same or different and are hydrogen or linear or branched alkyl radicals having up to at least 20 carbon atoms in the molecule with the provision that one of R 3 or R 4 must be other than hydrogen.
  • the process of the invention is carried out by reacting the phenolic starting material with at least one molar equivalent of aldehyde and at least 0.1 molar equivalent of amine. It is preferred, however, that the reaction be conducted with a molar excess of both aldehyde and amine reactants with respect to the starting phenol.
  • a preferred range of aldehyde to phenolic reactant is from 1 to 10 moles of aldehyde per mole of phenol.
  • a preferred molar range of amine reactant to phenolic reactant is from 0.1 to 10 moles of amine per mole of phenol.
  • the reaction can be conducted at a temperature from 50°C. to 250°C. While lower temperatures can be used, the reaction rates are generally too low to be of interest. Temperatures above 250°C. can be used, but excessive decomposition of the reaction components can occur. The preferred reaction temperatures are from 50°C. to 200°C.
  • the reaction can be conducted at atmospheric pressure or at higher pressures, with moderate pressures up to about 300 psig being preferred.
  • a solvent for the reaction mixture is not generally required, though, if desired, a solvent which is inert under the reaction conditions, i.e., those solvents which do not enter into the reaction, may be added to the reaction vessel.
  • Useful solvents comprise aprotic solvents which include ethers such as diethyl ether, dibutyl ether, 1-ethoxyhexane, tetrahydrofuran, 1,4-dioxane, 1, 3-dioxolane, dlglyme, 1, 2-diethoxyethane and tertiary amines such as pyridine, N-ethylpiperidine, triethylamine, tributylamine, N.N-diphenyl-N-methyl amine. N,N-dimethylalanine, etc.
  • ethers such as diethyl ether, dibutyl ether, 1-ethoxyhexane, tetrahydrofuran, 1,4-dioxane, 1, 3-dioxolane, dlglyme, 1, 2-diethoxyethane and tertiary amines such as pyridine, N-ethylpiperidine, triethyl
  • Especially useful solvents are dipolar aprotic solvents such as dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfone, tetramethylene sulfone, N-methylpyrrolidinone, acetonitrile and like materials.
  • dipolar aprotic solvents such as dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfone, tetramethylene sulfone, N-methylpyrrolidinone, acetonitrile and like materials.
  • Other solvents which are inert under the reaction conditions may be used: for example, low boiling hydrocarbons, halogenated hydrocarbons, examples of which are benzene, toluene, tetrachloroethane, the chlorinated benzenes, the chlorinated toluenes, etc.
  • Especially preferred solvents are lower alkanols having up to about 6 carbon atoms. These include methanol, ethanol, n-propanol, isopropyl alcohol, n-butanol, secbutyl alcohol, tert-butyl alcohol, n-pentanol, isopentyl alcohol, n-hexanol and isohexyl alcohol.
  • the amount of solvent can be expressed as a volume ratio of solvent to phenolic reactant. Suitable volume ratios of solvent to phenolic reactant can be from 0/1 to 500/1 and preferably from 1/1 to 300/1.
  • the mode of addition in the process is not particularly critical.
  • the reaction is carried out by passing the amine in its gaseous state through the reaction mixture in a reaction vessel with agitation to obtain intimate contact of the reactants.
  • the amount of amine in contact with the other reactants can be controlled by limiting the flow of amine through or into the reaction vessel.
  • the process should be carried out for the time sufficient to convert substantially all of the phenolic reactant to the corresponding p-alkenyl phenol.
  • the length of time for optimum yield will depend primarily upon the reaction temperature and the particular solvent, if any, used in the reactior. In general, excellent yields of p-alkenyl phenol are obtained in from about two to forty-eight hours.
  • substantially anhydrous is meant a reaction system wherein the total amount of water present is no more than about 5 percent by weight, based on the reaction mixture. When the amount of water in the system exceeds this, both reaction rate and yield of product decrease.
  • the process may readily be conducted in a batch-wise, semi-batch or continuous manner and in conventional equipment.
  • the product p-alkenyl phenol is easily separated from the reaction mixture by such means as distillation, extraction, crystallization and other methods obvious to those skilled in the chemical processing art.
  • 2,6-di-tertiary-butyl phenol (4.1 g; 20 mmol) , isobutyraldehyde (3 ml; 33 mmol), dimethylamine (1.5 g; 34 mmol) dissolved in isopropanol (7.5 g) were charged to a 100 ml glass vessel and refluxed at ambient pressure under nitrogen for 48 hours.
  • 1,1-hydrocarbyl-substituted-2-(3'-hydrocarbyl- or 3 ' , 5 ' -dihydrocarbyl-4 ' -hydroxyphenyl) ethene products produced by the process of the present invention can be directly oxidized to the corresponding 3-hydrocarbyl-4- hydroxybenzaldehyde or 3,5-dihydrocarbyl-4-hydroxyben- zaldehyde by contacting with good agitation the aforementioned 1,1-hydrocarbyl-substituted-2-(3'-hydrocarbyl- or 3',5'-dihydrocarbyl-4'-hydroxyphenyl) ethene with at least a stoichiometric amount of oxygen in the presence of a small catalytic quantity of a catalyst selected from the group consisting of a Lewis acid, an alkali metal salt of a weak acid or an alkaline mearth metal salt of a weak acid, an alkali
  • 4,009,210 discloses a method for preparing 3,5-di-tertbutyl-4-hydroxybenzaldehyde, a chemical intermediate for the manufacture of pesticides of the benzylidenemalononitrile type, by reacting 2, 6-di-tert-butylphenol with hexamethylenetetramine or a combination of formaldehyde and ammonium acetate in aqueous acetic acid reaction medium.
  • a new process for the synthesis of 3-hydrocarbyl-4-hydroxybenzaldehydes or 3,5-dihydrocarbyl-4-hydroxy ⁇ benzaldehydes has now been discovered in which these materials can be prepared in a simple and straightforward manner.
  • p-alkenyl phenols in particular 1,1-hydrocarbyl-substituted-2-(3'-hydrocarbyl- or 3',5'-dihydrocarbyl-4'-hydroxyphenyl)ethenes are contacted with oxygen in the presence of a catalyst selected from a Lewis acid, an alkali metal hydroxide or an alkaline earth metal hydroxide, an alkali metal of a weak acid or an alkaline earth metal salt of a weak acid or an amine base.
  • a catalyst selected from a Lewis acid, an alkali metal hydroxide or an alkaline earth metal hydroxide, an alkali metal of a weak acid or an alkaline earth metal salt of a weak acid or an amine base.
  • cleavage of the olefinic bond located at the 4-position of the phenyl ring of the p-alkenyl phenol reactant takes place by a radical process whereby the desired alkylated hydroxyphenyl aldehyde product is produced.
  • 1,1-hydrocarbyl-substituted-2-(3'-hydrocarbyl- or 3',5'-dihydrocarbyl-4'-hydroxyphenyl)ethenes which are oxidized according to the aforementioned process are those compounds described and prepared here-inabove.
  • the process is readily conducted by placing the 1,1-hydrocarbyl-substituted-2-(3'-hydrocarbyl- or 3',5'-dihydrocarbyl-4'-hydroxyphenyl) ethene and other reaction mixture components in a reaction vessel having agitation means, or can be advantagepusly carried out, for example, by passing the 1,1-hydrocarbyl-substituted-2-(3'- hydrocarbyl- or 3',5'-dihydrocarbyl-4'-hydroxyphenyl)ethene through appropriate reaction tubes and simply contacting the same with oxygen or an oxygen containing gas and catalyst.
  • the oxidation reaction should be carried out with agitation and preferably with vigorous agitation or using other means that afford intimate contact between the oxygen containing gas and the reaction mixture.
  • An essential component of the reaction mixture is a catalytic amount of a catalyst, the suitable catalysts being selected from the group consisting of alkali metal hydroxides, alkali metal salts of a weak acid, alkaline earth metal hydroxides, alkaline earth metal salts of a weak acid, amine bases, mixtures of the same and Lewis acid catalysts.
  • Suitable catalysts are sodium hydroxide, potassium hydroxide, barium hydroxide, rubidium hydroxide, cesium hydroxide, potassium carbonate, sodium carbonate, cesium carbonate, rubidium carbonate, potassium sulfite, sodium borate, potassium acetate, diazabicyclononane, pyridine, tetra-methylguanidine, 1,4-diazabicyclo-(2,2,2)-octane, FeCl 3 , BF 3 , ZnCl 2 , TiCl 4 , HF, H 2 SO 4 , H 3 PO 4 , SnCl 2 , SnCl 4 , and CuCl 2 . Copper chloride and ferric chloride are preferred catalysts.
  • the amount of catalyst used is not narrowly critical but only a small amount is sufficient to promote cleavage of the olefinic bond at the 4- position of the 1,1-hydrocarbyl-substituted-2-(3'-hydrocarbyl or 3',5'-dihydrocarby1-4'-hydroxyphenyl) ethene reactant.
  • the amount used can be as little as 0.1 weight percent through amounts up to 1 weight percent, based on the weight of p-alkenyl phenol reactant, and even greater amounts of catalyst may be used if desired.
  • the amount of oxygen employed relative to the 1,1-hydrocarbyl-substi ⁇ tuted-2-(3'-hydrocarbyl- or 3',5'-dihydrocarbyl-4'-hydroxyphenyl) ethene starting reactant is not critical. In general, only an amount of oxygen required for the direct oxidative cleavage of the p-alkenyl phenol to the corresponding benzaldehyde should be used. For best results, however, it is preferable that at least a stoichiometric amount of oxygen or an amount greater than that stoichiometric required is used.
  • the reaction is conducted, for example, by passing oxygen, and preferably an oxygen containing gas such as air , through the reaction mixture in a reaction vessel with agitation to obtain intimate contact of the reactants.
  • oxygen and preferably an oxygen containing gas such as air
  • the reaction is conducted at atmospheric pressure, however , higher pressures up to about 200 psig may be used, if desired.
  • the amount of oxygen reacting with the p-alkenyl phenol reactant can be, in general, easily controlled by limiting the flow of gas through or into the reaction zone.
  • the reaction can be conducted at mildly elevated temperatures of, for example, from 25°C. up to higher temperatures of 250°C. and preferably at a temperature that ranges from 50°C. up to 150°C. Reflux temperature at atmospheric pressure is effective and preferred.
  • a solvent for the reaction mixture is not generally required, though, if desired, a solvent which is inert under the reaction conditions, i.e., those solvents which do not enter into the reaction, may be added. to the reaction vessel.
  • Especially preferred solvents are dipolar aprotic solvents such as dimethyl sulfoxide, N, N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfone, tetramethylene sulfone, N-methylpyrrolidinone, acetonitrile and like materials.
  • solvents which are inert under the reaction conditions may be used: for example, tertiary amines such as pyridine, N-ethylpiperidine, triethylamine, tributyl- amine, N,N-diphenyl-N-methylamine, N,N-dimethylalanine; low boiling hydrocarbons and halogenated hydrocarbons, examples of which are benzene, toluene, tetrachloroethane, the chlorinated benzenes, the chlorinated toluenes, etc, and lower alkanols having up to about 6 carbon atoms which include methanol, ethanol, n-propanol, isopropyl alcohol, n-butanol, sec-butyl alcohol, tert-butyl alcohol, n-pentanol, isopentyl alcohol, n-hexanol and isohexyl alcohol.
  • tertiary amines such
  • the amount of solvent can be expressed as a volume ratio of solvent to alkenyl phenol reactant.
  • Suitable volume ratios of solvent to alkenyl phenolic reactant can be from 0/1 to 500/1 and preferably from 1/1 to 300/1.
  • the process should be carried out for a time sufficient to convert substantially all of the paraalkenyl phenol reactant to the corresponding alkylated hydroxyphenyl aldehyde.
  • the length of time for optimum yield depends primarily on the reaction temperature, the type and amount of catalyst and the particular solvent used in the reaction. In general, excellent yields of product are obtained in from 1.5 to 6 hours.
  • the process alternatively may be conducted to continuously produce the benzaldehyde products of the invention.
  • a suitable continuous reactor generally consisting of a length of vertically mounted reactor tubing having heating or cooling means surrounding it may be employed.
  • the product aldehyde can be easily separated from the reactant mixture by such means as distillation, recrystallization and other methods obvious to those skilled in the chemical processing art.
  • the following examples serve to illustrate the formation of alkylated hydroxyphenyl aldehydes from para-alkenyl phenols.
  • Example 19 Preparation of 2, 6-Di-t-Butyl-4-Hyd ⁇ oxybenzaldehyde A 100 ml glass reaction vessel was charged with 1.1 g (4.3 mmols) 1, 1-dimethyl-2-(3',5'-di-t-butyl-4'-hydroxyphenyl)-ethene. Ferric chloride hexahydrate (0.03 g; 0.12 mmols) was suspended in approximately 6 g of N,N-dimethylformamide and added to the reaction vessel. Oxygen ( 17. 7 g ; 550 mmols) was slowly introduced into the solution in the reactor which gradually darkened the solution.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP19840900176 1983-11-15 1983-11-15 PROCEDE DE PREPARATION DE PHENOLS DE p-ALCENYLE ET LEUR OXYDATION ULTERIEURE FORMANT DES BENZALDEHYDES SUBSTITUES. Withdrawn EP0163633A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1983/001815 WO1985002178A1 (fr) 1983-11-15 1983-11-15 PROCEDE DE PREPARATION DE PHENOLS DE p-ALCENYLE ET LEUR OXYDATION ULTERIEURE FORMANT DES BENZALDEHYDES SUBSTITUES

Publications (2)

Publication Number Publication Date
EP0163633A1 EP0163633A1 (fr) 1985-12-11
EP0163633A4 true EP0163633A4 (fr) 1986-04-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840900176 Withdrawn EP0163633A4 (fr) 1983-11-15 1983-11-15 PROCEDE DE PREPARATION DE PHENOLS DE p-ALCENYLE ET LEUR OXYDATION ULTERIEURE FORMANT DES BENZALDEHYDES SUBSTITUES.

Country Status (3)

Country Link
EP (1) EP0163633A4 (fr)
JP (1) JPS61500547A (fr)
WO (1) WO1985002178A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841623A (en) * 1957-05-08 1958-07-01 Shell Dev Process for the alkylation of phenols
US3435061A (en) * 1965-01-06 1969-03-25 Standard Oil Co Manufacture of aromatic aldehydes and nitriles
US3413347A (en) * 1966-01-26 1968-11-26 Ethyl Corp Mannich reaction products of high molecular weight alkyl phenols, aldehydes and polyaminopolyalkyleneamines
US3592951A (en) * 1967-12-28 1971-07-13 Ethyl Corp Process for alkylating a phenol
DE2363464C3 (de) * 1973-12-20 1981-10-22 Bayer Ag, 5090 Leverkusen Verfahren zur Herstellung von p-Alkenylphenolen
US4009210A (en) * 1975-05-07 1977-02-22 Gulf Oil Corporation Process for manufacturing 3,5-ditert.butyl-4-hydroxybenzaldehyde by formylation of 2,6-ditert.butylphenol
US4215229A (en) * 1978-06-15 1980-07-29 Koppers Company, Inc. Process for alkylating phenolic compounds to produce ortho- and para-monoalkylated phenols and 2,4- and 2,6-dialkylated phenols

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No relevant documents have been disclosed *
See also references of WO8502178A1 *

Also Published As

Publication number Publication date
JPS61500547A (ja) 1986-03-27
EP0163633A1 (fr) 1985-12-11
WO1985002178A1 (fr) 1985-05-23

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