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We wish to describe in detail a convenient new procedure for preparing 2-methylcycloheptane-1,3-dione (1)1 based on the method communicated by Saegusa and co-workers2 for the preparation of the parent cycloheptane-1,3-dione (2).3 In Saegusa and co-workers' procedure the enediol bis-silylether 4 was cyclopropanated (Et2Zn, CH2I2) to produce 5 which was subsequently oxidized (FeCl3, DMF) to 2.
2a Since the methylation of 2 to 1
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