The synthesis, characterization, and cyclopropanation activity of tetrahedral copper(I) complexes with bipyridine- and phenanthroline-based ligands containing strongly coordinated tetraphenylborate anions are reported. Cu(I)(bpy)(BPh(4)), Cu(I)(phen)(BPh(4)), and Cu(I)(3,4,7,8-Me(4)phen)(BPh(4)) complexes are the first examples in which the BPh(4)(-) counterion chelates a transition metal center in bidentate fashion through eta(2) pi interactions with two of its phenyl rings.
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