Methyl 2 cyclopropyl 2 diazoacetate was synthesized from acetylcyclopropane in few chemical steps in ~55% total yield. Its copper or rhodium catalyzed dediazoniation exclusively proceeds through the intramolecular isomerization of generated cyclopropyl(methoxy carbonyl)carbene to 1 methoxycarbonylcyclobutene, irrespective of the presence or the ab sence of unsaturated compounds. However, in the presence of acrylates or strained cycloalkenes, this diazo ester is being slowly involved into the 1,3 dipolar cycloaddition, giving cyclopropyl substituted pyrazolinecarboxylates, which in case of 1 pyrazolines easily lose nitrogen mol ecule to selectively afford 1 cyclopropylcyclopropanecarboxylate derivatives.
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