| abstract |
1514076 Carotenoid F HOFFMANN-LA ROCHE & CO AG 8 June 1976 [9 June 1975] 23638/76 Headings C2C C2V and C2P The invention comprises the compound of the formula The compound may be prepared by reacting a compound of the formula where R is C 3 -C 8 alkyl with a compound of the formula where Y is an alkali metal or MgX where X is halogen and R 1 is a hydroxy group or an ether group convertible into a hydroxy group by hydrolysis, to give a compound of the formula in which any ether group is subsequently hydrolysed and the product halogenated to give a compound of the formula which is converted to a phosphonium salt of the formula where Z is aryl or C 1 -C 7 alkyl from which the product of Formula VIIIb is obtained by reaction with 2,7 - dimethyl - octa - 2,6 - dien - 4 - yn- 1,8-diol. The product may be partially hydrogenated to yield canthaxanthin. |