Abstract
Three-membered rings as neutral, cationic, or radical species give a good opportunity to compare the chemistry of phosphorus, nitrogen, and carbon. Due to its specific properties, phosphorus has allowed for the isolation of original compounds which have so far few or even no counterparts in nitrogen and carbon chemistry: the diphosphorus analogue of the cyclopropenyl radical does not dimerize through σ(C-C) coupling but via π*-π* interaction leading to phosphorus-phosphorus one-electron bonds, while the phosphorus version of the amidinium salts adopts a cyclic form featuring some carbanionic character!
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