Abstract
1. Under electron impact and under conditions of chemical ionization in a methane medium, the cyclopropane ring in o-nitrophenylcyclopropanes is opened, as a result of which the carbenium center at the benzyl carbon atom interacts with the NO2 group, forming a cyclic five-membered ion. 2. Derivatives of 2-cyclopropyl-3-nitrothiophene and furan, under electron impact and under conditions of chemical ionization, do not manifest the capability for isomerization that is characteristic of the o-nitrophenylcyclopropanes.
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