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A potential equivalent of a cyclopropenyl anion is seen in the cyclopropene derivative (3), R1 = Ph, R2 = H, bearing an organometallic substituent. Its reaction with electrophiles gives almost exclusively the cyclopropenylium salts (4) ([Fe] = [Fe(C5H5)(CO)2]).
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Gompper et al. (1978) studied this question.
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