Structural Chemistry of Cu(I) Allyl and Acetylene π-Complexes

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Stereospecific behavior of allyl derivatives and acetylenes in CuX π-complexes (X = Cl, Br, NO3, BF4, 1/2SiF62−, 1/2SO42−) is studied by X-ray diffraction analysis. The influence of donor atoms N, S, and O and of the Cu–X bond polarization on the π-complex formation is considered. The efficiency of Cu–(C=C) and Cu–(C≡C) π-interaction and specific behavior of mono- and disubstituted acetylenes with respect to Cu(I) are compared.

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