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Theses compounds may be prepared by various methods but are most conveniently prepared by reacting a benzaldehyde with acetyl acetone in the presence of a suitable catalyst and reaction medium, preferably piperidine and cyclohexane, at reflux temperature under continuous azeotropic water removal. The benzaldehyde reactant will be that which corresponds to the desired substitution of the benzylidene derivative of the final benzylidene pentanedione. The crude product resulting from the foregoing reaction may then be purified by crystallization with methanol to produce the desired benzylidene 2,4-pentanedione. Suitable reactions and reaction conditions are set forth in the examples contained herein.

1. customTheses compounds may be prepared by various methods
2. customare most conveniently prepared
3. temperatureat reflux temperature under continuous azeotropic water
4. customremoval
5. customThe crude product resulting from the foregoing reaction
6. custommay then be purified by crystallization with methanol