Method for preparing an alpha-alkycinnamaldehyde

Details Method for preparing an alpha-alkycinnamaldehyde Method for preparing an alpha-alkycinnamaldehyde

1996-11-06

1998-03-17

Barts, Samuel

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C07C 4500

Patent

active

057288925

ABSTRACT:
The invention relates to a method for preparing an .alpha.-alkylcinnamaldehyde via aldol concensation of a benzaldehyde and an alkanal, with pyrrolidine being employed as a catalyst. The method is suitable, in particular, for preparing .alpha.-hexylcinnamaldehyde by aldol condensation of benzaldehyde and n-octanal, in particular for preparing .alpha.-hexylcinnamaldehyde of olfactory quality, since it was found that, in the method according to the invention, relatively little .alpha.-hexyldecenal, the aldol condensation product of n-octanal, is formed. Preferably, the aldol condensation is carried out without a solvent in the presence of an acid, and the alkanal is metered in over time to a mixture which contains pyrrolidine and benzaldehyde.

REFERENCES:
patent: 4920232 (1990-04-01), Goetz et al.
patent: 5214151 (1993-05-01), Nakajima et al.

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