Claims
- 1. The process of preparing a phenyl pentenal selected from the group consisting of 5-phenyl-4-pentenal and 4-phenyl-4-pentenal comprising the steps of (i) reacting a phenyl alkenyl bromide selected from the group consisting of phenyl allyl bromide having the structure: ##STR26## and .alpha.-bromomethyl styrene having the structure: ##STR27## with the lithium salt of a Schiff base of acetaldehyde with an organic amine thereby forming a 4- or 5-phenyl-4-pentenal Schiff base, the temperature range of the reaction between the phenyl alkenyl bromide and the Schiff base being from -70.degree. C. up to +30.degree. C., and (ii) subsequently acidifying the resultant 4- or 5-phenyl-4-pentenal Schiff base at a pH of approximately 1 with an acid selected from the group consisting of hydrochloric acid and sulfuric acid.
Parent Case Info
This application is a continuation-in-part of applicants' copending application Ser. No. 507,542, filed on Sept. 19, 1974, which, in turn is a division of applicants' parent application Ser. No. 283,632 filed on Aug. 25, 1972, now U.S. Pat. No. 3,862,340 issued on Jan. 21, 1975.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3365481 |
Wittig et al. |
Jan 1968 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
283632 |
Aug 1972 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
507542 |
Sep 1974 |
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