Studies on Ketene and Its Derivatives. XCII. Reaction of Diketene with Benzaldehyde, Cinnamaldehyde, and β-Phenylcinnamaldehyde

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Reaction of diketene with benzaldehyde (1) in the presence of sulfuric acid gives α-benzylideneacetoacetic acid (5). Similarly, reaction of diketene with cinnamaldehyde (2) and β-phenylcinnamaldehyde (3) gives 2-acetyl-5-phenyl-2, 4-pentadienoic acid (6) and 2-acetyl-5, 5-diphenyl-2, 4-pentadienoic acid (7), respectively.