Process for preparing halo acetals from enamines
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United States of America Patent
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Mar 8, 1994
Issued Date -
N/A
app pub date -
Mar 27, 1992
filing date -
Dec 1, 1989
priority date (Note) -
Expired
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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.
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