The reaction of the carbene–phosphinidene (1,3-dimesitylimidazolin-2-ylidene)PPh 1 with BH 3 ·thf affords the corresponding P-bonded bis(borane) adduct, thus demonstrating the availability of two lone pairs on the phosphorus centre; base competition studies reveal that 1 is a strong phosphorus base and, by means of cyclic voltammetry, it is established that 1 undergoes facile oxidation.
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Arduengo et al. (1997) studied this question.
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