Reactions of the multiply-bonded dirhenium(II) complexes Re2X4(μ-dppm)2(CNR) (X = Cl or Br; R = t-Bu or xylyl) with alkynes. Structural characterization of [Re2Cl3(μ-dppm)2(CN-t-Bu)(η2-HCCH)]O3SCF3 and a comparison with the related carbonyl species(1)

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