| 摘要 |
The present invention provides a process for producing alkylcyclopentanone derivatives of formula (1) by reacting alkyl cyclopentanone derivatives of formula (2) and alkyl halides of formula (3) in an organic solvent in the presence of molecular sieves and an alkaline metal hydroxide: <IMAGE> (1) <IMAGE> (2) R3X (3) wherein R1 is C1-C4 alkyl group; R2 is hydrogen atom or C1-C5 alkyl group; R3 is C1-C5 alkyl group; Y is halogen atom, C1-C5 alkyl group, C1-C5 haloalkyl group, phenyl group, cyano group or nitro group; n is an integer from 0 to 5; when n is 2 or greater, Y's may be identical or different; R3 in formula (3) is the same as R3 in formula (1); and a process for preparing alkylcyclopentanone derivatives of formula (5) by reacting cyclopentanone derivatives of formula (4) and alkyl halides of formula (6) in an organic solvent in the presence of molecular sieves and an alkaline metal hydroxide: <IMAGE> (4) <IMAGE> (5) RkX (6) wherein R1 is C1-C4 alkyl group; R4 is hydrogen atom or C1-C5 alkyl group; R5 is C1-C5 alkyl group; Rk is either R4 or R5; Y is halogen atom, C1-C5 alkyl group, C1-C5 haloalkyl group, phenyl group, cyano group or nitro group; n is an integer from 0 to 5; when n is 2 or greater, Y's may be identical or different.
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