Process for preparing halo acetals from enamines

Details Process for preparing halo acetals from enamines Process for preparing halo acetals from enamines

1992-03-27

1994-03-08

Ivy, C. Warren

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07F 906

Patent

active

052928977

ABSTRACT:
The present invention relates to a process for preparing halo acetals of ethylenic aldehydes by reaction of a halogen cation with enamine followed by a hydrolysis and reaction with an alcohol, a glycol or an orthoformate. These halo acetals are used as intermediate for the synthesis of vitamins A and E.
It also relates to a new compound of formula (IV), ##STR1## to a process for preparing it from halo acetals of ethylenic aldehydes by reaction with triethyl phosphate, and to its use for the preparation of retinal by reaction with .beta.-ionylideneacetaldehyde.

REFERENCES:
patent: 4087405 (1978-05-01), Wang et al.
patent: 4100201 (1978-07-01), Decor
patent: 5120864 (1992-06-01), Charbardes et al.
H. J. Hagemeyer, Jr., et al., "Reactions Of Isopropenyl Acetate," Indus. and Eng. Chem, 41(12):290-2924 (1949).
S. M. Makin et al., J. Gen. Chem. URSS, 32:1088-1092 (1962).

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