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F Hoffmann La Roche AG
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F Hoffmann La Roche AG
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Publication of ES230673A1publicationCriticalpatent/ES230673A1/en
Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
Process for the preparation of carotenoids, characterized in that a 3,8-dimethyl-2,9-dialkoxy decatetra- (1,3,7,9) -ina- (5), optionally dihydrogenated in position 5, is bilaterally condensed, 6, with a 4- [2 ', 6', 6'-trimethyl-cyclohexadien- (1 ', 3') -yl] -2-methyl-buten- (2) -acetal- (1) or with a 4 - [2 ', 6', 6'-trimethyl-hexen- (5 ') - ylidene] -2-methyl-buten- (2) -acetal- (1), or with a 4- [2', 6 ' , 6'-trimethyl-cyclohexen- (1) -yl] -2-methyl-buten- (2) -acetal- (1), optionally substituted at the 4 'position by a hydroxy or acyloxy group, or a 4- [2 ', 6', 6'-trimethyl-cyclohexylidene] -2-methyl-buten- (2) -acetal- (1), optionally substituted at the 4 'position by a hydroxy, acyloxy or oxo group, by which the product is treated of condensation obtained with an acid, by which the diketone-6,13 is hydrogenated to obtain the diol-6,13 and the latter is subjected, optionally after esterification, to a double elimination of water or acid with allylic transposition. (Machine-translation by Google Translate, not legally binding)
ES0230673A1955-08-311956-08-30Procedure for the preparation of carotenoids. (Machine-translation by Google Translate, not legally binding)
ExpiredES230673A1
(en)
Procedure for the preparation of a bitum emulsion, particularly intended for the coating of cold materials. (Machine-translation by Google Translate, not legally binding)