Plumbylene Structure
Plumbylenes (or plumbylidenes) are divalent organolead(II) analogues of carbenes, with the general chemical formula, R2Pb, where R denotes a substituent. Plumbylenes possess 6 electrons in their valence shell, and are considered open shell species. The first plumbylene reported was the dialkylplumbylene, Me3Si)2CHsub>2Pb, which was synthesized by Michael F. Lappert ''et al'' in 1973. Plumbylenes may be further classified into carbon-substituted plumbylenes, plumbylenes stabilized by a group 15 or 16 element, and monohalogenated plumbylenes (RPbX). Synthesis Plumbylenes can generally be synthesized via the transmetallation of PbX2 (where X denotes halogen) with an organolithium (RLi) or Grignard reagent (RMgX). The first reported plumbylene, (CH3)3Si)2CHsub>2Pb, was synthesized by Michael F. Lappert ''et al'' by transmetallation of PbCl2 with (CH3)3Si)2CHi. The addition of equimolar RLi to PbX2 produces the monohalogenated plumbylene (RPbX); addition of 2 equivalents lea ...
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