Process for preparing retinal

Details Process for preparing retinal Process for preparing retinal

1988-10-27

1990-11-06

Lee, Mary C.

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

Organic compounds

Sulfur containing

568 41, 546301, 548169, 548170, 548209, 548213, 548186, 548187, 548221, 548241, 548229, 548324, C07C 3302

Patent

active

049688448

ABSTRACT:
Retinal is prepared by condensing a C.sub.15 sulphide of formula: ##STR1## in which R.sub.1 denotes aryl, aralkyl, pyridyl, 2-thiazolyl, 2-benzothiazolyl, 2-benzimidazolyl or 2-benzoxazolyl, with a haloacetal of formula: ##STR2## in which X denotes a halogen atom and R denotes an alkyl radical containing 1 to 4 carbon atoms, to give a C.sub.20 sulphide acetal of formula: ##STR3## in which R.sub.1 and R are defined as above, hydrolysing the said sulphide acetal to give a C.sub.20 sulphide aldehyde of formula: ##STR4## in which R.sub.1 is defined as above, desulphurizing the said sulphide aldehyde to give retinal, and isolating the retinal obtained.

REFERENCES:
March, J. Advanced Organic Chemistry, 3rd. ed. Wiley & Sons (1987). pp. 329-30, 413-14.
Lowy, A. and Harrow, B. An Intro. to Organic Chemistry, 7th ed. Wiley & Sons (1951). p. 215.

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