Allyl acetyl derivatives of .beta., .gamma.-unsaturated aldehyde
申请人:Teijin Limited
公开号:US04209644A1
公开(公告)日:1980-06-24
An unsaturated carbonyl compound, for example, one expressed by the following formula, ##STR1## is prepared by maintaining at an elevated temperature a novel allyl acetal of a .beta.,.gamma.-unsaturated aldehyde, for example, one expressed by the following formula ##STR2## The allyl acetal can be derived, for example, for 3-methyl-3-butenal-1 having 5 carbon atoms and prenyl alcohol having 5 carbon atoms. Thus, the unsaturated aldehyde having the increased number of carbon atoms can be formed in a high yield by a relatively simple reaction.
Herstellung von Citral (I)
durch Erhitzen von Acetalen (IIa) oder (IIb)
in Gegenwart von sauren Katalysatoren, indem man das bei dieser Reaktion abgespaltene 3-Methylbut-2-en-1-ol (111, Prenol) laufend aus dem Reaktionsgemisch abdestilliert.