Processes for producing 4- and 5-phenyl pentenals

Details Processes for producing 4- and 5-phenyl pentenals Processes for producing 4- and 5-phenyl pentenals

1976-04-12

1977-07-19

Helfin, Bernard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260611A, 2603409, 2603407, 260566R, 252522, 426534, 426536, 426538, C07C 4500

Patent

active

040368866

ABSTRACT:
Described are processes for preparing novel 4- and 5-phenyl-pentenals, lower alkyl and lower alkylene acetals thereof having the structure: ##STR1## wherein one of X and Y is phenyl and the other of X and Y is hydrogen and A is a moiety selected from the group consisting of: ##STR2## WHEREIN R.sub.b and R.sub.b ' separately are the same or different lower alkyl or R.sub.b and R.sub.b ' taken together form a lower alkylene group either (i) comprising the step of intimately admixing the lithium salt of a Schiff base of acetaldehyde and an amine with a phenyl-substituted compound selected from the group consisting of phenyl alkanals and phenyl alkenyl bromides in order to produce a phenyl-substituted Schiff base and treating said phenyl-substituted Schiff base with an acid, or (ii) comprising the steps of first admixing phenyl propionaldehyde with a tri-substituted formyl methylene phosphorane in a non-reactive solvent and then heating the resulting mixture.

REFERENCES:
patent: 3365481 (1968-01-01), Wittig et al.

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