Cyclohexene → Dimethyl bicyclo[4.1.0]heptane-7,7-dicarboxylate

Beteiligte Stoffe

Reaktionsschritte

To stirred, refluxing mixture of 100.0 grams (1.22 mole) of cyclohexene and 0.037 gram (0.0001 mole) of cupric acetylacetonate was fed 22.7 grams (0.14 mole) of dimethyl diazomalonate over a 25-hour period by means of a syringe pump. Refluxing was continued for an additional 8 hours after which distillation of the reaction mixture was begun, employing a small Vigreux column. After removing about 32 grams of cyclohexene overhead, to a head temperature of 80° C., the residue was allowed to cool. The solidified residue was worked up by flash column chromatography on silica gel to give 17.53 grams (0.08 mole) of dimethyl bicyclo[4.1.0]heptane-7,7-dicarboxylate having a melting point of 83° C.-86° C. Elemental analysis of the product indicated the following:

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