Ralf Tonner and Gernot Frenking Divalent Carbon(0) Chemistry, Part 1: Parent Compounds Chemistry - A European Journal 14
Version of Record online: 3 MAR 2008 | DOI: 10.1002/chem.200701390
Unusual bonding situations were revealed by quantum-chemical calculations on the compounds CL2 with L=PR3, CO, NHC, C(NR2)2, according to which carbodicarbenes and carbodiphosphoranes should be classified as divalent carbon(0) compounds in which ligands L and a C atom with two lone-pair orbitals are involved in donor–acceptor interactions (see picture), while the quasi-linear carbon suboxide C3O2 and tetraaminoallenes (R2N)2CCC(NR2)2 exhibit “hidden” divalent carbon(0) character.
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