Reactions of disubstituted alkynes with bromotris(trimethylphosphine)cobalt(I). Synthesis and molecular and crystal structures of [Co(.eta.2-PhC.tplbond.CC5H11)(PMe3)3]BPh4 and [Co(.sigma.2-(CO2Me)4C4)(MeCN)2(PMe3)2]BPh4

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