Cyclopropene-3-carboxylates are promising reagents for organic synthesis.'The simplest way for their preparation is rhodium (I1) acetate-promoted cyclopropenation of corresponding alkynes with akyl diazoacetates. 2 Nevertheless, there is no information about the use this method for preparation of the first members of the homologous family of cyclopropene-3carboxylates, eg methyl cycle propene-3-carboxylate (la) and methyl I- ...
