Decomposition reactions of square-planar bis-aryl-cobalt(II) complexes

M. Antón, G. Muller, J. Sales, J. Vinaixa

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The organocobalt complexes [CoR2L2], with (a) L = PEtPh2 and R = 2,3,5,6- C6HCl4, 2,4,6-C6H2Cl3 and 2,6-C6H3Cl2; and (b) R = 2,4,6-C6H2Cl3 and L = PEt3, PEt2Ph, 1 2 dpe, 3,5-lut and 1 2 bipy, have been obtained by reaction of RMgX with [CoCl2L2] or by ligand exchange from [CoR2(PEtPh2)2]. The decompositions in benzene and carbon tetrachloride, and under oxidative conditions have been studied. In benzene solutions, the stability decreases with decrease in the number of chlorine atoms in R. A mixture of RH and RR is obtained in a ratio which depends on the nature of L, the configuration of the complex, and the presence of oxidants. The thermal decomposition takes place through a tricoordinate intermediate "CoR2L", when L = phosphine, or directly from [CoR2L2] when L = amine. The oxidatively induced decomposition takes place through a cobalt(III) intermediate, which gives RR when L = phosphine or RX (X = H, Br) when L = amine. The process is intramolecular in all cases.

Idioma originalAnglès
Pàgines (de-a)365-375
Nombre de pàgines11
RevistaJournal of Organometallic Chemistry
Estat de la publicacióPublicada - 23 de nov. 1982
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