(& C tf such that withdrawal of electrons from the diazo grouping to carbon leads to an aromatic resonance system of six electrons (IC and Id). 2 This situation should be reflected in considerably different behavior from that shown by diazomethane. Related to diazocyclopentadiene by loss of nitrogen is a carbene, cyclopentadienylene (IIb), in which a linear arrangement (IIa) of divalent carbon and its bonded carbon atoms is denied by the ...
