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Stable Five-Membered-Ring Allenes with Second-Row Elements Only: Not Allenes, But Zwitterions

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Abstract

A pyrazole derivative, considered as the stable five-membered cyclic allene 1 a by Dyker, Bertrand, et al., is reinterpreted to be a zwitterion 1 b. It is shown that the bonding characteristics typical for an allene are not possible for structure 1 a. Ar=2,6-dimethylphenyl.

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