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JPH08509229A |
(57) [Summary] 9-A method for stereospecific synthesis of cisolefins and retinoids. In one particular embodiment, cis-olefins are produced by ring opening of the lactol ring while completely retaining the configuration of the double bond.
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JP2525085B2 |
Provided is a process which comprises conducting the ring-closure of pseudoirone in the presence of chlorosulfonic acid, which is inexpensive, to obtain in a high yield the alpha -cis form of irone, which has nearly the same fragrance as...
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JP2520580B2 |
PURPOSE: To provide the subject novel synthetic intermediate useful for the direct synthesis of vitamin A or carotenoids at a high yield and at a high selectivity. CONSTITUTION: There is provided a novel intermediate of formula I (wherei...
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JP2520154B2 |
A process for producing carotenoids and carotenoid intermediates via reduction of sulfonyl polyenes with a dithionite in the presence of ammonia or an aliphatic amine, including novel intermediates in this process, which carotenoids are ...
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JPH08157416A |
PURPOSE: To obtain an ester of an alcohol having low reactivity especially owing to steric hindrance on an industrial scale at a low cost by reacting an alcohol with an acid anhydride or a mixed acid anhydride in the presence of a fluori...
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JP2506495B2 |
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JP2503346B2 |
PURPOSE: To obtain a polyene useful as a dye or a reactive substance by allylating an allyl-arylsulfone and then eliminating an arylsulfinic acid. CONSTITUTION: A polyene is obtd. by allylating the α-position of an allyl- arylsulfone wh...
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JP2502936B2 |
PURPOSE: To obtain a new acetylenic derivative useful as a synthetic intermediate of vitamins A and E. CONSTITUTION: The compound of formula I [R1 is phenyl or a group of formula II (R2 is a 1-11C saturated aliphatic group, 2-11C unsatur...
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JPH08120187A |
PURPOSE: To obtain the subject composition, excellent in stability for a long period, capable of imparting excellent flavor and appearance stabilities to beverages and suitable as an additive for the various beverages such as a soft drin...
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JPH0881438A |
PURPOSE: To obtain a new substance TMC-1 highly suppressing reproduction of human tumor cell, having low toxicity and high safety as a medicine useful for curing of breast cancer or ovarium cancer, etc., by culturing a microorgan ism bel...
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JPH0873312A |
PURPOSE: To obtain an external preparation for skin showing synergistic effect, blended with a bonded complex of an α-hydroxy acid effective for improving aging symptoms and retinol or a bonded complex of astaxanthin effective for preve...
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JPH0873311A |
PURPOSE: To obtain an external preparation for skin having proper water solubility, stably mixable, showing synergistically preventing effect on aging of skin with a small amount, blended with a specific derivative of astaxanthin capable...
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JPH0867666A |
PURPOSE: To obtain a powdery pharmaceutical preparation, containing a carotenoid extracted from palm oil, excellent in preservation stability without any fear of decomposition of the carotenoid and useful as a colorant for foods and drin...
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JPH0819089B2 |
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JPH0819088B2 |
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JPH0819087B2 |
The present invention relates to a process for the preparation of vitamin A which consists in placing cyclogeranylsulphone in contact with a C10 aldehyde acetal, in halogenating the derivative obtained and in then removing the halogen gr...
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JPH0819029B2 |
Preparation of cycloaliphatic ketones by deprotonation of an ester of formula …… containing either an isolated double bond in the 1 or 2 (exocyclic) position, or two conjugated double bonds in positions 1 and 3 or 2 (exocyclic) and 3...
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JPH0820774A |
PURPOSE: To obtain a highly powerful antioxidant by mixing an extract from Houttuynia cordata with β-crotene. CONSTITUTION: This antioxidant comprises an extract from Houttuynia cordata and β-carotene, and has an antioxidant action mor...
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JPH08793B2 |
4,4,7-trimethyl-3,4,7,8-tetrahydro-2(6H)-naphthalen-one is obtained by an elimination reaction from 3-oxo- alpha -ionol by way of direct addition thereof to a solution of a protonic acid in an inert solvent at an elevated temperature, or...
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JPH07116092B2 |
A process for the preparation of polyene aldehydes of the formula I …… in which R represents …… where R' has the meaning alkyl, aryl, aralkyl or cycloalkyl and, if desired, can be further substituted and the radicals R'' represen...
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JPH07116133B2 |
Process for preparing vitamin A which is practically free from 2- cis and 6-cis isomers by hydrogenation of vitamin A aldehyde, optionally in the form of a complex with hydroquinone, in the presence of a ruthenium hydride as catalyst.
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JPH07324056A |
PURPOSE: To readily obtain the subject compound as a raw material for manufacturing vitamin A acetate by a new method using a pentenyn-ol as a starting material. CONSTITUTION: At first, 2-hydroxy-2-methyl-3-butynal of formula II and a 1-...
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JPH07309832A |
PURPOSE: To obtain a carotene compound useful as a food additive, etc., in high purity and yield and in a short process by reacting two specific compounds with each other in the presence of a base and a palladium complex and subsequently...
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JPH07107044B2 |
A process to prepare retinoyl chlorides, e.g., of the following formula (I): under very mild chlorinating conditions by the action of a reagent amount of dimethylchloroformamidinium chloride on a corresponding retinoic acid.
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JPH07300443A |
PURPOSE: To obtain a new fluorinated abscisic acid derivative useful as an active ingredient for plant growth regulators such as germination inhibitor, growth regulator, lodging inhibitor, etc., and a synthetic intermediate for the activ...
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JPH07103095B2 |
The invention provide a process for producing vitamin A aldehyde in high yield by oxidizing vitamin A with a aldehyde of the general formula (1) wherein R1, R5 and R3 are the same or different and respectively represents a lower alkyl gr...
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JPH0798797B2 |
Retinoids of the formula R1-OCH(R2)OC(O)R3 wherein R1 signifies 13-cis-retinoyl, R2 signifies hydrogen or lower-alkyl and R3 signifies straight-chain lower-alkyl can be used as medicaments in the case of dermatological disorders.
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JPH07508992A |
The invention concerns materials with non-linear optical properties and which contain more than 10 conjugated double bonds in the molecule. The non-linear optical properties can be produced either by use of the compounds in the pure stat...
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JPH07242590A |
PURPOSE: To obtain a compound having growth-inhibiting activity of plants and long-term germination-inhibiting activity of plants and useful as a plant growth regulator. CONSTITUTION: An abscisic acid derivative is expressed by formula I...
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JPH07242621A |
PURPOSE: To provide an extracting method having an extremely high extraction efficiency, capable of extracting a carotenoid compound even from a water- containing substance to be extracted. CONSTITUTION: A substance to be extracted conta...
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JPH0780834B2 |
A process for the recovery of carotenes comprises the steps of transesterification of oil containing carotenes and vacuum distillation, and is characterised in that 0.1% to 50% of edible oil is added to the transesterified oil containing...
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JPH0780865B2 |
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JPH0778031B2 |
PURPOSE:To readily obtain the titled compound useful as a perfume substance in high purity and selectivity, by subjecting cis-gamma-irone to catalytic reducing reaction in an organic solvent in the presence of palladium catalyst. CONSTIT...
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JPH07224029A |
PURPOSE: To obtain a new antioxidant suitable for foods, medicines and cosmetics and having high safety and excellent oxidation-resistant activity derived from nature. CONSTITUTION: This carotenoid-containing extract having excellent oxi...
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JPH0764807B2 |
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JPH0759494B2 |
Process for the preparation of an isomeric mixture of cis- and trans-1-(2,6,6-trimethylcyclohexyl)-hexan-3-ol according to a three-step pathway starting from trimethylcyclohexanone.
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JPH07165702A |
PURPOSE: To isolate a natural type abscisic acid being an important compound as a natural plant hormone and capable of expecting wide uses such as plant growth regrator, etc., in high purity and yield from a solution containing the natur...
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JPH07149714A |
PURPOSE: To provide a method for separating α-carotene from mixed carotenes by treating the solution of the mixed carotenes by a chromatography method, capable of efficiently separating the α-carotene by using an adsorbing agent high i...
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JPH0751557B2 |
Process for the preparation of retinal by condensation of a C15 sulphide of formula (I) with a C5 haloacetal of formula (II) followed by the hydrolysis and the desulphurisation of the C20 acetal sulphide of formula (III) via the intermed...
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JPH0735366B2 |
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JPH0735367B2 |
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JPH07101857A |
PURPOSE: To provide an antiulcer agent containing vitamin A acid zinc salt as an active ingredient, having a strong antiulcer action, capable of being applied for a long period, and not causing a side effect. CONSTITUTION: The antiulcer ...
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JPH0782246A |
PURPOSE: To obtain the compound which is used as a dye, etc., for coloring fish pigments, etc., by halogenating a specific tertiary alcohol or the like, then converting it into a phosphonium salt by phosphines in an inert solvent and all...
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JPH0776570A |
PURPOSE: To carry out efficient isolation of abscisic acid in high selectivity and yield from a dilute solution of abscisic acid without concentration of the organic layer extracting abscisic acid using a reduced amount of the solvent. C...
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JPH0776571A |
PURPOSE: To carry out efficient isolation of abscisic acid in a high yield from a dilute solution containing abscisic acid using a reduced amount of the solvent. CONSTITUTION: The isolation process for abscisic acid comprises the extract...
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JPH0717661B2 |
A silyl-enol ether of the formula I wherein n stands for the number and X stands for a group or n stands for the number 1 and X stands for the 6,11-dimethylhexadeca-2,4,6,8,10,12,14-heptaene-2,15-diyl group, the symbols R1 have the same ...
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JPH06329623A |
PURPOSE: To easily obtain a vitamin A derivative, esp. wholly transform vitamin A derivative in high yield and purity. CONSTITUTION: The objective vitamin A derivative, e.g. a compound of formula III, can be obtained by reaction of (A) a...
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JPH06329568A |
PURPOSE: To prepare a novel compound having a strong antagonism against leukotriene B4 receptors which is useful for medical treatment and prevention of such inflammatory disorders as arthritis, pneumonia, dermatitis, nephritis or the li...
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JPH0688926B2 |
Described is an isomer-directed process for producing asymmetric ketones defined according to the generic structure:wherein one of Z, or Z2 is the moiety:and the other of Z1 or Z. is hydrogen; wherein R11 and R21 represent hydrogen or th...
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JPH06312975A |
PURPOSE: To efficiently and selectively isolate abscisic acid from a dilute solution containing the abscisic acid in high yield without concentrating an organic layer extracted with an organic solvent by reducing the amount of the organi...
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