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)C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CN(But)Li with ECl3 and the structures of 1a and 1b are compared with those of pertinent saturated analogues.
C. J. Carmalt and V. Lomeli, Chem. Commun., 1997, 2095 DOI: 10.1039/A704838F
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