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Ralf Tonner and Gernot Frenking Divalent Carbon(0) Chemistry, Part 2: Protonation and Complexes with Main Group and Transition Metal Lewis Acids Chemistry - A European Journal 14

Version of Record online: 3 MAR 2008 | DOI: 10.1002/chem.200701392

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Very strong donor–acceptor complexes with the Lewis bases BH3 and CO2 are formed by compounds CL2 with L=PR3, CO, NHC, C(NR2)2, which are very strong Lewis bases with high proton affinities according to quantum-chemical calculations. Their divalent carbon(0) character is revealed by the large values of the second protonation energy. It also comes to the fore in the complexes L2C–(BH3)2, which are calculated as energy minima on the potential-energy surfaces. A=H+, BH3, CO2, W(CO)5, Ni(CO)3, Ni(CO)2.

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