An asymmetrically bridging aryldiamine ligand is the salient structural feature of the binuclear complex 1, formed from the corresponding alkylidenetantalum complex and neopentylzinc chloride with elimination of neopentane. The structural data indicate that the TaCZn bridge lies midway in character between a three-center two-electron bond and a combination of a TaC σ bond and a coordinative C→Zn bond.
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Abbenhuis et al. (1991) studied this question.
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