CH220348A - Process for producing a chroman compound. - Google Patents
Process for producing a chroman compound.Info
- Publication number
- CH220348A CH220348A CH220348DA CH220348A CH 220348 A CH220348 A CH 220348A CH 220348D A CH220348D A CH 220348DA CH 220348 A CH220348 A CH 220348A
- Authority
- CH
- Switzerland
- Prior art keywords
- compounds
- vitamin
- compound
- producing
- allyl
- Prior art date
Links
- -1 chroman compound Chemical class 0.000 title claims description 14
- 238000000034 method Methods 0.000 title claims description 8
- 239000013078 crystal Substances 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- AUFZRCJENRSRLY-UHFFFAOYSA-N 2,3,5-trimethylhydroquinone Chemical compound CC1=CC(O)=C(C)C(C)=C1O AUFZRCJENRSRLY-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- GVJHHUAWPYXKBD-UHFFFAOYSA-N (±)-α-Tocopherol Chemical compound OC1=C(C)C(C)=C2OC(CCCC(C)CCCC(C)CCCC(C)C)(C)CCC2=C1C GVJHHUAWPYXKBD-UHFFFAOYSA-N 0.000 description 19
- 229930003427 Vitamin E Natural products 0.000 description 9
- WIGCFUFOHFEKBI-UHFFFAOYSA-N gamma-tocopherol Natural products CC(C)CCCC(C)CCCC(C)CCCC1CCC2C(C)C(O)C(C)C(C)C2O1 WIGCFUFOHFEKBI-UHFFFAOYSA-N 0.000 description 9
- 235000019165 vitamin E Nutrition 0.000 description 9
- 239000011709 vitamin E Substances 0.000 description 9
- 229940046009 vitamin E Drugs 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 8
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 150000004808 allyl alcohols Chemical class 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 150000002989 phenols Chemical class 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 125000003277 amino group Chemical class 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- VZWXIQHBIQLMPN-UHFFFAOYSA-N chromane Chemical group C1=CC=C2CCCOC2=C1 VZWXIQHBIQLMPN-UHFFFAOYSA-N 0.000 description 2
- NNBZCPXTIHJBJL-UHFFFAOYSA-N decalin Chemical compound C1CCCC2CCCCC21 NNBZCPXTIHJBJL-UHFFFAOYSA-N 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011592 zinc chloride Substances 0.000 description 2
- 235000005074 zinc chloride Nutrition 0.000 description 2
- 239000001707 (E,7R,11R)-3,7,11,15-tetramethylhexadec-2-en-1-ol Substances 0.000 description 1
- 235000001815 DL-alpha-tocopherol Nutrition 0.000 description 1
- 239000011627 DL-alpha-tocopherol Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- BLUHKGOSFDHHGX-UHFFFAOYSA-N Phytol Natural products CC(C)CCCC(C)CCCC(C)CCCC(C)C=CO BLUHKGOSFDHHGX-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- HNZBNQYXWOLKBA-UHFFFAOYSA-N Tetrahydrofarnesol Natural products CC(C)CCCC(C)CCCC(C)=CCO HNZBNQYXWOLKBA-UHFFFAOYSA-N 0.000 description 1
- MZHJJOMWLPIVFA-UHFFFAOYSA-N [Na].C#C Chemical compound [Na].C#C MZHJJOMWLPIVFA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- BOTWFXYSPFMFNR-OALUTQOASA-N all-rac-phytol Natural products CC(C)CCC[C@H](C)CCC[C@H](C)CCCC(C)=CCO BOTWFXYSPFMFNR-OALUTQOASA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012230 colorless oil Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000008298 dragée Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 229910000039 hydrogen halide Inorganic materials 0.000 description 1
- 239000012433 hydrogen halide Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 125000001820 oxy group Chemical group [*:1]O[*:2] 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- VHGBWHGICRTHIQ-UHFFFAOYSA-N phytadiene Natural products CCCCCCCCCCCCCCCC=C(/C)C=C VHGBWHGICRTHIQ-UHFFFAOYSA-N 0.000 description 1
- BOTWFXYSPFMFNR-PYDDKJGSSA-N phytol Chemical compound CC(C)CCC[C@@H](C)CCC[C@@H](C)CCC\C(C)=C\CO BOTWFXYSPFMFNR-PYDDKJGSSA-N 0.000 description 1
- 125000001189 phytyl group Chemical group [H]C([*])([H])/C([H])=C(C([H])([H])[H])/C([H])([H])C([H])([H])C([H])([H])[C@@](C([H])([H])[H])([H])C([H])([H])C([H])([H])C([H])([H])[C@@](C([H])([H])[H])([H])C([H])([H])C([H])([H])C([H])([H])C(C([H])([H])[H])([H])C([H])([H])[H] 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 150000003722 vitamin derivatives Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D311/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings
- C07D311/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only hetero atom, condensed with other rings ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D311/04—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring
- C07D311/58—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring other than with oxygen or sulphur atoms in position 2 or 4
- C07D311/70—Benzo[b]pyrans, not hydrogenated in the carbocyclic ring other than with oxygen or sulphur atoms in position 2 or 4 with two hydrocarbon radicals attached in position 2 and elements other than carbon and hydrogen in position 6
- C07D311/72—3,4-Dihydro derivatives having in position 2 at least one methyl radical and in position 6 one oxygen atom, e.g. tocopherols
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pyrane Compounds (AREA)
Description
Verfahren zur Herstellung einer Chromanverbindung. Die bisher bekannten synthetischen Ver fahren zur Darstellung von Vitamin E be nutzen als eine der erforderlichen Um setzungsteilnehmer das Phytol bezw. dessen Halogenwasserstoffester oder das Phytadien. Diese Substanzen sind an sich sehr kostbar, da sie aus pflanzlichen Naturprodukten nur auf mühsame Weise in geringer Menge ge wonnen werden können.
Infolgedessen sind Versuche bekannt geworden, das Vitamin E, dessen Konstitution als 2,5,7,8-Tetramethyl- 6-ogy-2-(4',8',12'-trimethyl-tridecyl)-chroman erkanntwordenist, durchnaheverwandteVer- bindungen ähnlicher Konstitution zu ersetzen, deren Wirkung qualitativ und quantitativ der des natürlichen Vitamins nahe kommt. Solche Versuche sind bisher ohne Erfolg gewesen, da alle zum Vergleich dargestellten Verbin- dunben um ein Vielfaches weniger wirksam als .das natürliche Vitamin E gewesen sind.
Insbesondere galt dies von allen Verbindun gen, deren aliphatische Seitenkette in 2-Stel- lung des Chromanringes Abweichungen von der Seitenkette des natürlichen Vitamins E zeigte.
Es wurde gefunden, dass man Chroman- verbindungen mit guter Vitamin E-Wirkung gewinnen kann, wenn man auf gegebenen falls kernalkylierte Phenole, die eine freie o-Stellung zur Hydrogylgruppe 'besitzen und deren p-Stellung durch gegebenenfalls eub- stituierte Hydrogyl- oder Aminogruppen substituiert sein kann, Allylalkohole oder Allylhalogenide,
deren y-Kohlenstoffatom einerseits durch Alkyl, anderseits durch einen gewöhnlichen aliphatischen Kohlenwasser stoffrest von 18-17 Kohlenstoffatomen sub stituiert ist, oder aus derartigen Allylverbin- dungen erhältliche Dienverbindungen, zweck mässig in Gegenwart an sich üblicher Kon- densationsmittel, einwirken lässt und in dem Fall,
in dem das Ausgangsphenol in p-Stel- lung nicht durch eine gegebenenfalls substi tuierte Hydrogyl- oder Aminogruppe substi- tuiert ist, nachträglich eine solche Gruppe nach an sich üblichen Arbeitsweisen in 6- Stellung der gebildeten Chromanverbindung einführt. Als den Phenolkern substituierende Alkylgruppen sind vorzugsweise drei Me- thylgruppen vorhanden.
Der in der Allyl- verbindung bezw. in der daraus erhältlichen Dienverbindung vorhandene gewöhnliche, ali- phatische Kohlenwasserstoffrest von 13 bis 17 Kohlenstoffatomen ist zweckmässig im Gegensatz zu der bei Verwendung von Phy- tylverbindungen anfallenden 4,8,12,
Trime- thyl-tridecyl-Seitenkette unverzweigt. Der weitere am y-Kohlenstoffatom der Allyl- verbindungen bezw. der daraus erhältlichen Dienverbindung vorhandene Alkylrest ist vorzugsweise eine Methylgruppe. Die Um setzung wird z. B. durch Erhitzen der Um setzungsteilnehmer in An- oder Abwesen heit eines organischen Lösemittels, z. B. Ligroin, Benzol oder Dekalin, vorgenommen.
Die Verwendung von Kondensationsmitteln, z. B. Zinkchlorid, Aluminiumchlorid, erweist sich als günstig. Ist man von in der p-Stel- lung unsubstituierten Phenolen ausgegangen, dann wird in das erhaltene Chromau nach an sich bekannten Arbeitsweisen eine Amino- oder Oxygruppe, die substituiert sein kann, eingeführt. Die nach diesen Angaben hergestellten Verbindungen zeigen dem natürlichen und synthetischen Vitamin E gegenüber manche Vorteile.
Sie können sehr viel leichter her gestellt werden, da die gekennzeichneten y,y-dis@ubstituierten Allylalkohole, -halogenide oder die entsprechenden Diene aus höhe ren Fettsäuren leicht zugänglich sind. Die Verfahrensprodukte sind durchweg feste, kristallisierte Verbindungen, die sich daher sehr viel leichter in praktische Anwendungs formen, Tabletten, Dragees <B>USW.,</B> bringen lassen als 8a,9 dickflüssige Vitamin E. Ausserdem sind sie gegen Sauerstoff sehr viel weniger empfindlich.
Vitamin E färbt sich beim Stehen an der Luft bekanntlich nach kurzer Zeit dunkel unter Oxydations erscheinungen. Die Verfahrensprodukte zei- gen dagegen auch bei tagelangem Stehen an der Luft keine Verfärbung.
Die als Ausgangsstoff angewandten Allyl- bezw. Dienverbindungen erhält man dadurch, dass man Acetylen und Acetylennatrium auf entsprechend zusammengesetzte Dialkyl- ketone einwirken lässt, in den entstandenen Äthinyldialkylcarbinolen die dreifache Bin dung zur Doppelbindung reduziert,
die so er- hä.ltlicben Verbindungen durch Einwirkung von Halogenwasserstoffsäure in die am y-Kohlenstoffatom entsprechend dialkylier- ten Allylhalonenide umwandelt und letztere gegebenenfalls zu den entsprechenden Allyl- alkoholen verseift bezw. durch Ilalogenwas- serstoffabspaltung in die zugehörigen Dien verbindungen umwandelt.
Gegenstand des vorliegenden Patentes ist ein Verfahren zur Herstellung einer Chro- manverbindung. welche.. dadurch gekenn zeichnet ist, dass Trimethylhydrochinon mit 3 -l#,lethyl -3 - n-hexadecyl-1-brompropen-'(2) zum 6-Oxy-2,5,7,8-tetramethyl-2-n-hexadecyl- chroman kondensiert wird. Das so erhältliche Produkt bildet farblose Kristallschuppen vom Schmelzpunkt 68 . Es soll therapeutische Anwendung finden. Das Absorptionsspek trum dieser Verbindung ist mit dem dea Vitamins E nahezu identisch.
Es zeigt. ein Maximum mit zwei Gipfeln bei etwa 295 m,u, ein Minimum bei etwa 157 m,y und im Maxi mum .die analoge Feinstruktur. Beispiel: 3 g Trimethyl-hydrochinon, 5 g 3-Me- thyl-3-n-hexadecyl-l-brompropen-(2) und 2 g Zinkchlorid werden in 50 cm' Ligroin unter Rühren und Durchleiten eines Stickstoff stromes langsam auf 70-80 " erwärmt. Die anfangs starke Entwicklung von Brom- wasserstoff wird nach etwa 30 Minuten schwächer und ist nach weiteren 2 Stunden beendet.
Die erkaltete Mischung wird fil triert, der Filterrückstand mit Ligroin nach gewaschen und das Filtrat unter verminder tem Druck eingedampft. Der Rückstand wird in einem Gemisch von gleichen Teilen Äther und Petroläther gelöst, die Lösung zweimal mit verdünnter Natronlauge, dann mit Wasser ausgezogen, mit Natriumsulfat getrocknet und filtriert. Nach Verdampfen der Lösemittel bleibt ein rasch kristallisie s render, gelblichweisser Rückstand, der im Vakuum destilliert wird. Nach kurzem Vor lauf geht die Hauptmenge als fast farbloses 01 über, das bei etwa 235-245 unter 0,2 mm Druck (im Luftbad erhitzt) siedet.
io Das Destillat erstarrt sofort zu einer Kristall masse vom Schmelzpunkt<B>68'.</B> Durch Um lösen aus wenig Alkohol erhält man das 6 - Oxy - 2, 5, 7,8 - tetramethyl - 2 - n -(hexadecyl - chroman in farblosen Kristallschuppen vom <B>15</B> Schmelzpunkt 68 . Das Absorptionsspek trum dieser Verbindung ist mit dem des Vitamins E nahezu identisch. Es zeigt ein Maximum mit zwei Gipfeln bei etwa 295 m,u, ein Minimum bei etwa 257 mu und im Maxi mum die analoge Feinstruktur.
Process for producing a chroman compound. The previously known synthetic Ver drive for the representation of vitamin E be use as one of the necessary implementation participants in the phytol BEZW. its hydrogen halide ester or phytadiene. These substances are very valuable in themselves, as they can only be obtained in small quantities in a laborious manner from natural plant products.
As a result, attempts have become known to use closely related compounds to vitamin E, the constitution of which has been recognized as 2,5,7,8-tetramethyl-6-ogy-2- (4 ', 8', 12'-trimethyl-tridecyl) -chromane of a similar constitution, the effect of which is qualitatively and quantitatively close to that of the natural vitamin. Such attempts have so far been unsuccessful, since all the compounds shown for comparison have been many times less effective than natural vitamin E.
This was especially true of all compounds whose aliphatic side chain deviated from the side chain of the natural vitamin E in the 2-position of the chroman ring.
It has been found that chroman compounds with a good vitamin E action can be obtained if, if appropriate, nucleus-alkylated phenols which have a free o-position to the hydrogen group and their p-position by optionally substituted hydrogen or amino groups may be substituted, allyl alcohols or allyl halides,
whose y-carbon atom is substituted on the one hand by alkyl, on the other hand by an ordinary aliphatic hydrocarbon radical of 18-17 carbon atoms, or diene compounds obtainable from such allyl compounds, expediently in the presence of conventional condensation agents, and in that case ,
in which the starting phenol in the p-position is not substituted by an optionally substituted hydroyl or amino group, such a group is subsequently introduced in the 6-position of the chroman compound formed according to conventional procedures. The alkyl groups substituting the phenol nucleus are preferably three methyl groups.
The respectively in the allyl compound. The usual aliphatic hydrocarbon radical of 13 to 17 carbon atoms present in the diene compound obtainable therefrom is useful in contrast to the 4,8,12 obtained when using phy- tyl compounds,
Trimethyl tridecyl side chain unbranched. The other on the y-carbon atom of the allyl compounds BEZW. the alkyl radical which can be obtained therefrom is preferably a methyl group. The implementation is z. B. by heating the To conversion participants in the presence or absence of an organic solvent, z. B. ligroin, benzene or decalin made.
The use of condensing agents, e.g. B. zinc chloride, aluminum chloride, proves to be favorable. If the starting point is phenols which are unsubstituted in the p-position, then an amino or oxy group, which may be substituted, is introduced into the chromau obtained by working methods known per se. The compounds produced according to this information show some advantages over natural and synthetic vitamin E.
They can be made much more easily, since the labeled y, y-dis @ substituted allyl alcohols, halides or the corresponding dienes are easily accessible from higher fatty acids. The products of the process are all solid, crystallized compounds, which are therefore much easier to form into practical application, tablets, dragees, etc., than 8a, 9 viscous vitamin E. They are also very effective against oxygen less sensitive.
It is well known that vitamin E turns dark after a short time when standing in the air with signs of oxidation. The products of the process, on the other hand, show no discoloration even when left in air for days.
The allyl or used as starting material. Diene compounds are obtained by letting acetylene and acetylene sodium act on correspondingly composed dialkyl ketones, reducing the triple bond to a double bond in the ethynyl dialkyl carbinols formed,
the compounds thus obtainable are converted by the action of hydrohalic acid into the allyl halonides correspondingly dialkylated on the γ-carbon atom and the latter optionally saponified or respectively saponified to give the corresponding allyl alcohols. converted into the associated diene compounds by splitting off halogenated hydrogen.
The present patent relates to a process for the production of a chromane compound. which .. is characterized in that trimethylhydroquinone with 3 -l #, lethyl -3 - n-hexadecyl-1-bromopropene - '(2) to 6-oxy-2,5,7,8-tetramethyl-2-n -hexadecyl- chromane is condensed. The product obtainable in this way forms colorless crystal flakes with a melting point of 68. It should find therapeutic application. The absorption spectrum of this compound is almost identical to that of vitamin E.
It shows. a maximum with two peaks at about 295 m, u, a minimum at about 157 m, y and at the maximum the analogous fine structure. Example: 3 g of trimethyl-hydroquinone, 5 g of 3-methyl-3-n-hexadecyl-1-bromopropene- (2) and 2 g of zinc chloride are slowly increased to 70% in 50 cm of ligroin with stirring and a stream of nitrogen. 80 ". The initially strong development of hydrogen bromide becomes weaker after about 30 minutes and ends after a further 2 hours.
The cooled mixture is filtered, the filter residue is washed with ligroin and the filtrate is evaporated under reduced pressure. The residue is dissolved in a mixture of equal parts of ether and petroleum ether, the solution is extracted twice with dilute sodium hydroxide solution and then with water, dried with sodium sulfate and filtered. After evaporation of the solvent, a rapidly crystallizing, yellowish-white residue remains, which is distilled in vacuo. After a short run, the main amount passes over as an almost colorless oil that boils at around 235-245 under 0.2 mm pressure (heated in an air bath).
io The distillate immediately solidifies to a crystal mass with a melting point of <B> 68 '. </B> By dissolving it from a little alcohol, you get 6 - oxy - 2, 5, 7,8 - tetramethyl - 2 - n - (hexadecyl - chroman in colorless crystal scales with a melting point of <B> 15 </B> 68. The absorption spectrum of this compound is almost identical to that of vitamin E. It shows a maximum with two peaks at about 295 m, u, a minimum at about 257 mu and in the maximum the analog fine structure.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE220348X | 1939-12-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH220348A true CH220348A (en) | 1942-03-31 |
Family
ID=5834007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH220348D CH220348A (en) | 1939-12-02 | 1940-11-05 | Process for producing a chroman compound. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH220348A (en) |
-
1940
- 1940-11-05 CH CH220348D patent/CH220348A/en unknown
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