Patent ID: 7148372

Claim:
A method for synthesizing a retinoid or carotenoid, comprising reacting a compound of formula (1) wherein G represents a —NR 4 R 5 group where R 4 and R 5 , which are identical or different, are each a linear or branched alkyl group of 1 to 5 carbon atoms, or a cycloalkyl group of 3 to 7 carbon atoms, or R 4 and R 5 together with the nitrogen atom carrying them form a ring, R 1 represents a hydrogen atom or a linear or branched alkyl group of 1 to 5 carbon atoms, n is an integer equal to 1 or 2, R 2 and R 3 represent an identical or different substituent in each unsaturated unit, successive unsaturated units being identical or different and are selected from hydrogen and a linear or branched alkyl group of 1 to 5 carbon atoms, provided that at least one of the substituents R 1 , R 2 and R 3 is not hydrogen, and Y 1 and Y 2 each represent a —COOR 7 group where R 7 is an alkyl group of 1 to 5 carbon atoms with a compound of formula (5) wherein Z is to yield the retinoid or carotenoid.