A tetrahedral tetraalkynylcuprate—a new structural unit for organocopper compounds—and a “crown” formed from three Li[PhCCCuCCPh] units (A) are contained in the first lithium alkynylcuprate 1. This complex was prepared from copper(I) bromide dimethylsulfide and LiCCPh.
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Olbrich et al. (1993) studied this question.
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