In a simple exchange reaction zirconacycle 1 is converted into the new heterocycles 2 and 3 by treatment with Ar′GaCl2 and Ar′InBr2, respectively. Gallacyclopentadiene 2 is monomeric and its five-membered ring is planar. The cyclopentadiene ring and the aryl ring are nearly orthogonal owing to steric interactions. Compound 2 can be converted readily into a (C5H5)Co complex. Ar′ = 2,4,6-tBu3C6H2.
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Cowley et al. (1994) studied this question.
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