METHOD FOR THE PRODUCTION OF PHYTOFLUENE

摘要

The invention relates to a method for the production of phytofluene of formula I, where a) a phosphonium salt of formula II is condensed with an aldehyde of formula III to give an acetal of formula IV in a Wittig reaction, b) the condensation product of formula IV undergoes an acid-catalysed acetal hydrolysis to give the aldehyde of formula V and c) V is condensed with a phosphonium salt of formula VI to give phytofluene in a further Wittig reaction, whereby the groups R<1>, R<2>, R<7>, X<-> and Y<-> have the meanings given in the description.