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A 2.14 g. portion of 7-(2-oxocyclopentyl)-heptanoic acid was dissolved in 20 ml. of anhydrous ether and cooled to 0° C. in an ice bath. The stirred solution was then treated with ethereal diazomethane in about 1 ml. portions to control gas evolution until the yellow color persisted and bubbling was slow. The excess reagent was then blown off with a stream of nitrogen and the solvent evaporated at the rotovap. The residual oily ester was dried in vacuo over phosphorous pentoxide.

1. custombubbling
2. customthe solvent evaporated at the rotovap
3. dry with materialThe residual oily ester was dried in vacuo over phosphorous pentoxide