- Novel Tocopherol Compounds VII. γ-Tocopherol-5-carboxylic Acid - A Novel Route to γ-Tocopherol
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A novel route for the synthesis of γ-tocopherol starting from the readily available vitamin E (α-tocopherol) has been found. The key step is the photochemical decarboxylation of γ-tocopherol-5- carboxylic acid.
- Rosenau, Thomas,Habicher, Wolf D.
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- FORMATION OF CHIRAL 4-CHROMANONES USING CHIRAL PYRROLIDINES IN THE PRESENCE OF ACIDS
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The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of a specific type and of at least one Bransted acid or in the presence a specific chiral compound having a Bransted acid functional group in the molecule.
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Page/Page column 32; 33
(2015/01/16)
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- PROCESS OF SEPARATING CHIRAL ISOMERS OF CHROMAN COMPOUNDS AND THEIR DERIVATIVES AND PRECURSORS
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The present invention relates to a process of separating chiral isomers of chroman compounds, particularly tocopherols and tocotrienols as well as the esters and intermediates thereof. It has been found that this process allows a separation of the desired isomer with a higher yield and enables the use of the non-desired isomers in a very efficient way. Said process is particularly useful when implemented in an industrial process. Furthermore, it has been found that this process allows using isomer mixtures as they result from traditional industrial synthesis.
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Page/Page column 32-33
(2012/12/13)
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- Process for separating tocopherol homologues
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Methods for separating gamma and delta homologues of tocopherol are described.
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Page/Page column 2-3
(2008/06/13)
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- 3-methoxybenzyl thiourea derivatives and improved lipid compositions containing same
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1-(3-methoxybenzyl)-3-substituted thiourea antioxidant compounds and improved lipids compositions which are supplemented with amounts of such antioxidant compounds effective for augmenting oxidative stability of the base lipid are provided. Also provided are methods for enhancing the oxidative stability of a lipid comprising supplementing a base lipid in need of enhanced oxidative stability with at least one 1-(3-methoxybenzyl)-3-substituted thiourea compound of the present invention.
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- Preparation of chromanyl derivatives
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A process for the preparation of chromanyl derivatives of the formula I STR1 where R1 is hydrogen, C1 -C8 -alkyl, aryl, aralkyl, Si(R4)3, C(=O)R4 or C1 -C4 -alkoxymethyl, R2 and R3 are hydrogen or C1 -C3 -alkyl, and R4 is C1 -C8 -alkyl or aryl, which comprises decarboxylating 5-carboxychromanyl derivatives of the formula II STR2 where the substituents R1 to R3 are as defined above and 5-carboxylchromanyl derivatives of the formula II.
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- Biotenside esters and phosphatides with vitamin-D and vitamin-E compounds
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New biotenside esters and phosphatides formed with Vitamin-D and Vitamin-E compounds possessing a pronounced antitumor activity, processes for their production as well as for the preparation of concentrates and pharmaceutical compositions containing these new esters and phosphatides, and their use for treating tumors are described.
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- Process for separation of tocopherol homologues
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A process for separating the various members of a tocopherol homologue mixture to obtain fractions of the separate tocopherol homologues. The isolation of the various tocopherol homologues is accomplished by selective deacylation of tocopheryl esters followed by separation of the esters from the free tocopherols.
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- STUDIES ON TOCOPHEROLS II. CONVENIENT SYNTHESIS OF TOCOPHEROLS
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A convenient synthesis of tocopherols from methylbenzoquinone and isoprenyl alcohol in high yiels is described.
- Kajiwara, M.,Sakamoto, O.,Ohta, S.
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p. 1995 - 1998
(2007/10/02)
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