The “selective” protonolysis of the β-diketiminato calcium derivative [Ca{(NDippCMe) 2 CH}{N(SiMe 3 ) 2 }(THF)] (Dipp = C 6 H 3 i Pr 2 -2,6) with a selection of terminal alkynes has produced a series of dimeric acetylides [Ca{(NDippCMe) 2 CH}{μ-C⋮CR}] 2, which have been characterized in solution and in the solid state. The asymmetry of the Ca−C−Ca‘ bridges is subtly dependent upon the extent of “side-on” (π-type) interaction between the acetylide unit and the Ca‘ centers.
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Avent et al. (2005) studied this question.
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