CH524554A - Prepn of sec polyfluoropropanols by - Google Patents
Prepn of sec polyfluoropropanols byInfo
- Publication number
- CH524554A CH524554A CH1670271A CH1670271A CH524554A CH 524554 A CH524554 A CH 524554A CH 1670271 A CH1670271 A CH 1670271A CH 1670271 A CH1670271 A CH 1670271A CH 524554 A CH524554 A CH 524554A
- Authority
- CH
- Switzerland
- Prior art keywords
- palladium
- catalyst
- carbon
- hydrogen
- hexafluoroacetone
- Prior art date
Links
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- VBZWSGALLODQNC-UHFFFAOYSA-N hexafluoroacetone Chemical compound FC(F)(F)C(=O)C(F)(F)F VBZWSGALLODQNC-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- 239000001257 hydrogen Substances 0.000 claims abstract description 9
- BYEAHWXPCBROCE-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-ol Chemical compound FC(F)(F)C(O)C(F)(F)F BYEAHWXPCBROCE-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical class CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000005297 pyrex Substances 0.000 claims description 2
- 239000012808 vapor phase Substances 0.000 claims description 2
- 150000001298 alcohols Chemical class 0.000 claims 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims 2
- 238000004140 cleaning Methods 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000004821 distillation Methods 0.000 claims 1
- 238000004508 fractional distillation Methods 0.000 claims 1
- 238000001030 gas--liquid chromatography Methods 0.000 claims 1
- 238000002329 infrared spectrum Methods 0.000 claims 1
- 239000000047 product Substances 0.000 claims 1
- 238000001228 spectrum Methods 0.000 claims 1
- 239000000543 intermediate Substances 0.000 abstract description 4
- 229920000642 polymer Polymers 0.000 abstract description 3
- 230000003444 anaesthetic effect Effects 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract description 2
- 239000004094 surface-active agent Substances 0.000 abstract description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 abstract 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract 1
- JNCMHMUGTWEVOZ-UHFFFAOYSA-N F[CH]F Chemical compound F[CH]F JNCMHMUGTWEVOZ-UHFFFAOYSA-N 0.000 abstract 1
- 108010081348 HRT1 protein Hairy Proteins 0.000 abstract 1
- 102100021881 Hairy/enhancer-of-split related with YRPW motif protein 1 Human genes 0.000 abstract 1
- 239000004952 Polyamide Substances 0.000 abstract 1
- 229940124326 anaesthetic agent Drugs 0.000 abstract 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052794 bromium Inorganic materials 0.000 abstract 1
- 238000010531 catalytic reduction reaction Methods 0.000 abstract 1
- 229910052801 chlorine Inorganic materials 0.000 abstract 1
- 239000000460 chlorine Substances 0.000 abstract 1
- 229910052736 halogen Inorganic materials 0.000 abstract 1
- 150000002367 halogens Chemical class 0.000 abstract 1
- 150000002431 hydrogen Chemical class 0.000 abstract 1
- 229920002647 polyamide Polymers 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 2
- -1 hexafluoroisopropyl Chemical group 0.000 description 2
- NMFQPFSIPWZZMR-UHFFFAOYSA-N 1,1,1,2,3,3-hexafluoropropan-2-ol Chemical compound FC(F)C(F)(O)C(F)(F)F NMFQPFSIPWZZMR-UHFFFAOYSA-N 0.000 description 1
- MNSWITGNWZSAMC-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropan-2-yl prop-2-enoate Chemical compound FC(F)(F)C(C(F)(F)F)OC(=O)C=C MNSWITGNWZSAMC-UHFFFAOYSA-N 0.000 description 1
- WBXAHKZHOCTGLP-UHFFFAOYSA-N 1,1,2,2,3,3,3-heptafluoropropan-1-ol Chemical compound OC(F)(F)C(F)(F)C(F)(F)F WBXAHKZHOCTGLP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910000431 copper oxide Inorganic materials 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012280 lithium aluminium hydride Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- LVKCSZQWLOVUGB-UHFFFAOYSA-M magnesium;propane;bromide Chemical compound [Mg+2].[Br-].C[CH-]C LVKCSZQWLOVUGB-UHFFFAOYSA-M 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- MUMZUERVLWJKNR-UHFFFAOYSA-N oxoplatinum Chemical compound [Pt]=O MUMZUERVLWJKNR-UHFFFAOYSA-N 0.000 description 1
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 1
- 229910003446 platinum oxide Inorganic materials 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000007420 reactivation Effects 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C31/00—Saturated compounds having hydroxy or O-metal groups bound to acyclic carbon atoms
- C07C31/34—Halogenated alcohols
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/02—Brushing apparatus, e.g. with auxiliary instruments for mechanically loosening dirt
- E01H1/05—Brushing apparatus, e.g. with auxiliary instruments for mechanically loosening dirt with driven brushes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Secondary polyfluoropropanols of formula (I), (II) and (III) are prepared by subjecting 1,3-dihalo-1,1,3,3-tetrafluoroacetone, 3-halo-1,1,1,3,3-pentafluoroacetone or 1,1,1,3,3,3-hexafluoroacetone in the vapour phase to catalytic reduction with hydrogen, using a catalyst consisting of palladium on carbon, the halogen consisting of bromine or chlorine. CHF2CH(OH)CHF2 (I) CHF2CH(OH)CF3 (II) CF3CH(OH)CF3 (III). The polyfluoropropanols are useful as solvents for polymers such as polyamides, and as intermediates in the prepn. of polymers, anaesthetics and surface active agents.
Description
Verfahren zur Herstellung eines sekundären, polyfluorierten Propanols Die vorliegende Erfindung bezieht sich auf ein neues und verbessertes katalytisches Verfahren zur Herstellung des sekundären, polyfluorierten Propanols der Formel CF3CH(OH)CF3 (1,1,1,3,3,3-Hexafluorpropan-2-ol) aus Hexafluoraceton. 1,1,1,3,3,3-Hexafluorpropan-2-ol wird in der belgischen Patentschrift Nr. 634 368 als wertvolles oberflächenaktives Mittel und Emulgator beschrieben. Es ist auch bekannt als Lösungsmittel für bestimmte polymere Materialien, wie z.B. die Vinylcarboxylatpolymerisate der US-Patentschrift Num mer 3 153 004, als Zwischenprodukt für die Herstellung verschiedener polymerer Materialien, z.
B. die Hexafluoriso- propylacrylatpolymerisate der US-Patentschrift Nr. 3 117 185, und als Zwischenprodukt für die Herstellung von 2,4'-Bis- (hexafluorisopropyl)-diphenylsulfondicarboxylat, das ein strömungsfähiges Wärmeübertragungsmaterial und ein Schmiermittel für hohe Temperatur ist (vgl. die US-Patent- schrift Nr. 3 324 169). 1,1,1,3,3,3-Hexafluorpropan-2-ol ist auch ein wertvolles Zwischenprodukt für die Herstellung anästhetisch wirkender Verbindungen gemäss der US-Pa- tentschrift Nr. 3 346 448.
Die bekannten Verfahren zur Herstellung von 1,1,1,3,3,3-
EMI0001.0008
Für das erfindungsgemässe Verfahren ist die Verwendung eines frischen aktiven Katalysators wichtig, d.h. eines solchen, der nicht durch vorherige Verwendung in einer katalytischen Reaktion ohne anschliessende Reaktivierung verbraucht wurde und der nicht vergiftet ist, wie dies z. B. während der Lagerung unter normalen atmosphärischen Bedingungen er folgen kann.
Im allgemeinen liegt die Palladiummenge im Katalysator zwischen 0,1 und 5 Gew.% Palladium. Der Katalysator be steht vorzugsweise aus 2 Gew. % Palladium auf Kohlekörnern mit einer Teilchengrösse von 1,68 bis 4,76 mm, die unmittel bar vor der Verwendung durch Erhitzen in einem Rohr auf Hexafluorpropan-2-ol erfolgen durch Reduktion von Hexa- fluoraceton mit Natriumborhydrid gemäss der USSR-Patent- schrift Nr. 138 604, mit Isopropylmagnesiumbromid gemäss Bull. Acad. Sci. (USSR), Div. Chem. Sci.
(in Englisch), Seite 663 (1962), mit Lithiumaluminiumhydrid gemäss der US-Patentschrift Nr. 3 227 674 oder mit Wasserstoff unter Verwendung eines Katalysators aus metallischem Kupfer und Chromoxyd gemäss der belgischen Patentschrift Nr. 634 368, einem nicht auf einem Träger vorliegenden Platinoxydkataly sator gemäss J. Am. Chem. Soc. Bd. 86, Seite 4948-52 (1964), oder einem auf einem Träger vorliegenden Palla dium-auf-Aluminiumoxyd-Katalysator in Tablettenform ge- mäss der niederländischen Patentanmeldung Nr. 6 610 936.
Das erfindungsgemässe Verfahren liefert 1,1,1,3,3,3- Hexafluorpropan-2-ol in hohen Ausbeuten durch Carbonyl- reduktion von 1,1,1,3,3,3-Hexafluoraceton.
Das Verfahren gemäss der Erfindung ist dadurch gekenn zeichnet, dass man 1,1,1,3,3,3-Hexafluoraceton mit Wasser stoff unter Verwendung eines frischen, aktiven Palladium-auf- Kohle-Katalysators in der Dampfphase katalytisch hydriert.
Das erfindungsgemässe Verfahren kann durch die fol gende allgemeine Gleichung dargestellt werden: 300 C in einem Strom von trockenem Stickstoff und etwa anschliessend reinem Wasserstoff entwässert wurden.
Ein geeignetes Verfahren zur Herstellung des erfindungs gemässen Katalysators besteht im Imprägnieren eines Kohle- Trägermaterials, z. B. Kohlekörner mit einer Teilchengrösse von 1,68 bis 4,76 mm, die vorher mit entionisiertem Wasser gewaschen wurden, mit einer wässrigen, ein Oxydationsmittel, wie Wasserstoffperoxyd, enthaltenden Palladiumchloridlö- sung unter Ausfällung von metallischem Palladium auf den Kohlekörnern und anschliessendem Waschen und Trocknen des Katalysators, z. B. gemäss der US-Patentschrift Num mer 3 138 560.
Ein von der Firma Engelhard Industries in den Handel gebrachter Katalysator aus 2 Gew. % Palladium auf Kohle körnern mit einer Teilchengrösse von 2,38 bis 4,76 oder 1,68 bis 4,76 mm hat sich als äusserst geeignet für das erfindungs- gemässe Verfahren erwiesen.
Unter den bevorzugten Verfahrensbedingungen wird das Perfluoraceton katalytisch mit einem Überschuss an Wasser stoff bei Temperaturen von 180 bis 225 C und einer Kon taktzeit von etwa 1 bis 30 Sekunden umgesetzt, worauf das gewünschte Reaktionsprodukt gewonnen wird.
Für diese Reaktion wird vorzugsweise ein Überschuss von mindestens etwa 40 Mol% Wasserstoff verwendet.
Eine Kontaktzeit von etwa 3 Sekunden reicht gewöhnlich für die gewünschte Carbonylreduktion von Hexafluoraceton aus.
Unter Anwendung der obigen Bedingungen liegt das Ge wichtsverhältnis von Perfluoraceton zu Palladium gewöhnlich zwischen etwa 200:1 und etwa 1000:1.
Ein erfindungsgemäss besonders bevorzugtes Reaktions verfahren ist dadurch gekennzeichnet, dass man eine Mi schung aus Perfluoraceton und Wasserstoff durch einen in einem Pyrex- oder Nickelrohr enthaltenen Katalysator leitet und die Reaktionsdämpfe in einer geeigneten, auf etwa 70 C, z.B. mit Trockeneis, gekühlten Falle kondensiert.
Das nach dem obigen Verfahren hergestellte Perfluor- propanol enthält gewöhnlich geringe Mengen an Wasser und sauren Verunreinigungen. Gegebenenfalls können diese sau ren Verunreinigungen durch Kontakt mit einem alkalischen Reagenz, wie Natriumcarbonat oder Natriumbicarbonat, ent fernt werden. Zur Wasserentfernung aus diesem Propanol
EMI0002.0007
Process for Making a Secondary Polyfluorinated Propanol The present invention relates to a new and improved catalytic process for the preparation of the secondary polyfluorinated propanol of the formula CF3CH (OH) CF3 (1,1,1,3,3,3-hexafluoropropane-2) -ol) from hexafluoroacetone. 1,1,1,3,3,3-hexafluoropropan-2-ol is described in Belgian Patent No. 634,368 as a useful surfactant and emulsifier. It is also known as a solvent for certain polymeric materials, e.g. the vinyl carboxylate polymers of US Pat. No. 3,153,004, as an intermediate for the preparation of various polymeric materials, e.g.
B. the hexafluoroisopropyl acrylate polymers of US Pat. No. 3,117,185, and as an intermediate for the production of 2,4'-bis (hexafluoroisopropyl) diphenylsulfonedicarboxylate, which is a flowable heat transfer material and a lubricant for high temperatures (cf. U.S. Patent No. 3,324,169). 1,1,1,3,3,3-hexafluoropropan-2-ol is also a valuable intermediate for the production of anesthetic compounds according to US Pat. No. 3,346,448.
The known processes for the production of 1,1,1,3,3,3-
EMI0001.0008
The use of a fresh active catalyst is important for the process of the invention, i. one that has not been consumed by prior use in a catalytic reaction without subsequent reactivation and that is not poisoned, as z. B. during storage under normal atmospheric conditions he can follow.
In general, the amount of palladium in the catalyst is between 0.1 and 5% by weight of palladium. The catalyst is preferably composed of 2% by weight of palladium on carbon grains with a particle size of 1.68 to 4.76 mm, which take place immediately before use by heating to hexafluoropropan-2-ol by reducing hexafluoroacetone with sodium borohydride according to USSR patent specification No. 138 604, with isopropyl magnesium bromide according to Bull. Acad. Sci. (USSR), Div. Chem. Sci.
(in English), p. 663 (1962), with lithium aluminum hydride according to US Pat. No. 3,227,674 or with hydrogen using a catalyst of metallic copper and chromium oxide according to Belgian Pat. No. 634,368, which is not on a carrier Platinum oxide catalyst according to J. Am. Chem. Soc. Vol. 86, pages 4948-52 (1964), or a palladium-on-aluminum oxide catalyst present on a carrier in tablet form according to Dutch patent application no. 6 610 936.
The process according to the invention gives 1,1,1,3,3,3-hexafluoropropan-2-ol in high yields by carbonyl reduction of 1,1,1,3,3,3-hexafluoroacetone.
The process according to the invention is characterized in that 1,1,1,3,3,3-hexafluoroacetone is catalytically hydrogenated with hydrogen using a fresh, active palladium-on-carbon catalyst in the vapor phase.
The method according to the invention can be represented by the following general equation: 300 ° C. in a stream of dry nitrogen and approximately then pure hydrogen were dehydrated.
A suitable method for preparing the catalyst, according to the Invention, consists in impregnating a carbon support material, e.g. B. carbon grains with a particle size of 1.68 to 4.76 mm, which have previously been washed with deionized water, with an aqueous palladium chloride solution containing an oxidizing agent such as hydrogen peroxide, with precipitation of metallic palladium on the carbon grains and subsequent washing and Drying the catalyst, e.g. B. in accordance with U.S. Patent No. 3,138,560.
A catalyst made of 2% by weight of palladium on carbon grains with a particle size of 2.38 to 4.76 or 1.68 to 4.76 mm, which is marketed by Engelhard Industries, has proven to be extremely suitable for the invention Proven procedure.
Under the preferred process conditions, the perfluoroacetone is catalytically reacted with an excess of hydrogen at temperatures of 180 to 225 ° C. and a contact time of about 1 to 30 seconds, whereupon the desired reaction product is obtained.
An excess of at least about 40 mole percent hydrogen is preferably used for this reaction.
A contact time of about 3 seconds is usually sufficient for the desired carbonyl reduction of hexafluoroacetone.
Using the above conditions, the weight ratio of perfluoroacetone to palladium is usually between about 200: 1 and about 1000: 1.
A particularly preferred reaction process according to the invention is characterized in that a mixture of perfluoroacetone and hydrogen is passed through a catalyst contained in a Pyrex or nickel tube and the reaction vapors are heated in a suitable temperature to about 70 ° C., e.g. condensed with dry ice, cooled trap.
The perfluoropropanol produced by the above process usually contains small amounts of water and acidic impurities. Optionally, these acidic contaminants can be removed by contact with an alkaline reagent such as sodium carbonate or sodium bicarbonate. To remove water from this propanol
EMI0002.0007
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US78757568A | 1968-12-27 | 1968-12-27 | |
| CH1861669A CH525172A (en) | 1968-12-27 | 1969-12-15 | Process for the production of secondary, polyfluorinated propanols |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH524554A true CH524554A (en) | 1972-06-30 |
Family
ID=25721339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH1670271A CH524554A (en) | 1968-12-27 | 1969-12-15 | Prepn of sec polyfluoropropanols by |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH524554A (en) |
-
1969
- 1969-12-15 CH CH1670271A patent/CH524554A/en not_active IP Right Cessation
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PL | Patent ceased |