Prodn. of allyl aldehyde intermediates, esp. for polyene cpds.

摘要

Prodn. of allyl aldehydes of formula (I) comprises oxidn. of the corresponding allyl alcohol (II) in the presence of a catalytically oxidising ruthenium cpd. or complex (III) and a N,N,N-trisubstd. N-oxide co-oxidant of formula (R')3-N<+>-O<-> (IV). R<1> = CO-R<4>, CH(OR<5>)(OR<6>) or CH2-OR<7>; R<2>, R<3> = H, Me or Et; R<4> = 1-4C alkoxy; R<5>, R<6> = 1-4C alkyl (opt. bonded to a 5- or 6-membered ring); R<7> = lower alkyl or lower alkylcarbonyl; R' = alkyl, alkoxy or alkoxyalkyl with up to 6C or 2 R''s form a 5- or 6-membered heterocycle.