Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1990-12-03
1992-09-08
Ivy, C. Warren
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
549347, 549369, 549455, 568590, 568593, C07D31716, C07D 4330
Patent
active
051459728
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
Morris & Boyd, Organic Chemistry, 1974, p. 455.
H. J. Hagemeyer, Jr., et al., "Reactions Of Isopropenyl Acetate," Indus. and Eng. Chem. 41(12):2920-2924 (1949).
S. M. Makin et al., J. Gen. Chem. URSS, 32:1088-1092 (1962).
Chabardes Pierre
Duhamel Lucette
Duhamel Pierre
Guillemont Jerome
Poirier Jean-Marie
Covington Raymond
Ivy C. Warren
Rhone-Poulenc Nutrition Animale
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