Rasmus J Enemærke, Gitte H Hjøllund, Kim Daasbjerg, Troels Skrydstrup
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Is the trinuclear complex the true reducing species in the Cp2TiCl2/Mn- and Cp2TiCl2/Zn-promoted pinacol coupling?
Through a combination of kinetic, voltammetric and product analysis, it has been found that a common TiIII species obtained from the metal reduction of Cp2TiCl2 is involved in the electron transfer to benzaldehyde. A common species in the pinacol dimerization step was also demonstrated. In neither of the two steps is it necessary to invoke trinuclear complexes as previously proposed.
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