Process for the preparation of unsaturated carbonyl compounds

Details Process for the preparation of unsaturated carbonyl compounds Process for the preparation of unsaturated carbonyl compounds

1974-05-06

1976-08-31

Moatz, Harry I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260598, 260599, 260601R, 260611R, 260611A, 260611F, 260614R, 260494, 260488R, C07D30746, C07C 4720, C07C 4745

Patent

active

039780929

ABSTRACT:
An unsaturated carbonyl compound, for example, one expressed by the following formula ##EQU1## is prepared by maintaining at an elevated temperature an allyl acetal of an .alpha.,.beta.-unsaturated aldehyde, for example, one expressed by the following formula ##EQU2## or a novel dienyl ether derived from it, for example, one expressed by the following formula ##EQU3## The allyl acetal can be derived, for example, from .beta.-methylcrotonaldehyde having 5 carbon atoms and prenyl alcohol having 5 carbon atoms. It is possible therefore to introduce an allyl residue containing at least 3 carbon atoms into the carbon atoms at the .gamma.-position to the carbonyl group of an .alpha., .beta.-unsaturated aldehyde containing at least 5 carbon atoms by a reaction consisting of the reduced number of steps. Moreover, the unsaturated aldehyde having the increased number of carbon atoms can be formed at a high yield by a relatively simple reaction.

REFERENCES:
patent: 2501144 (1950-03-01), Saunders

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