New intermediates, process for their preparation, and their use

Details New intermediates, process for their preparation, and their use New intermediates, process for their preparation, and their use

1992-03-27

1993-11-30

Hollrah, Glennon H.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549221, 549357, 549374, 549378, 549429, 549430, 549453, 549455, C07D31906, C07D31718

Patent

active

052667081

ABSTRACT:
New intermediates and processes for the preparation of vitamins A and E, which are the acetals of 5,6-dihalo-3-methyl-3-hydroxyhexanal or of 6-halo-3-hydroxy-3-methyl-5-hexenal or 3-methyl-3-hydroxy-5-hexenal, as well as processes for making the intermediates. After dehydrohalogenation and dehydration these intermediates are condensed directly with .beta.-ionone or with 2-methyl-2-heptene-6-one to synthesize vitamins A and E respectively.

REFERENCES:
patent: 2816117 (1957-12-01), Cawley
patent: 4268444 (1981-05-01), Jaedicke
Kumadaki et al, Chem. Pharm. Bull. 1987, 515-520.

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