Preparation of cyclic acetals of trans-4-chloro-3-methyl-but-2-e

Details Preparation of cyclic acetals of trans-4-chloro-3-methyl-but-2-e Preparation of cyclic acetals of trans-4-chloro-3-methyl-but-2-e

1980-04-08

1982-06-15

Love, Ethel G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549375, C07D31904

Patent

active

043350470

ABSTRACT:
A process for the preparation of 6-membered cyclic acetals of trans-4-chloro-3-methyl-but-2-en-1-al by reacting the corresponding acetals of 3-methyl-but-2-en-1-al (prenal), in a halohydrocarbon, with sulfuryl chloride and for their subsequent oxidation to trans-3-methyl-but-2-ene-1,4-dial-1-monoacetals (3-methyl-fumarodialdehyde-1-monoacetals). The trans-3-methyl-but-2-ene-1,4-dial-1-monoacetals are of great importance in terpene syntheses, since they make it possible to carry out successive Wittig reactions giving a very large number of compounds of biological and pharmacological importance.

REFERENCES:
patent: 3840559 (1974-10-01), Hoffmann
patent: 4044026 (1977-08-01), Paust
patent: 4192806 (1980-03-01), Paust et al.
patent: 4256643 (1981-03-01), Jaedicke et al.

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