Cyclic phosphenium (1a) and arsenium (1b) cations are formed either by treatment of germylene 2b with ECl3 (E = P, As) or via the metathetical reaction of LiN(But)CCN(But)Li with ECl3 and the structures of 1a and 1b are compared with those of pertinent saturated analogues.
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Carmalt et al. (1997) studied this question.
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