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A novel entry to cyclopropanimines (2) is afforded by the photolysis of the pyrazolinimines (1). The reaction is surprisingly strongly dependent upon temperature, but—as far as is known—hardly dependent upon solvent (benzene, cyclohexane). X in (1) and (2) is NCH3, NCH2C(CH3)3, and N-c-C6H11.
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Quast et al. (1980) studied this question.
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