Abstract (Me 3 P) 2 Ni(C 2 H 4 ) (5) and (dmpe) 2 Ni2(C 2 H 4 ) 3 (6) react with various alkynes including ethyne (acetylene) and 1-alkynes to form the crystalline compounds (Me 3 P) 2 Ni(C 2 RR′), (dmpe)Ni(C 2 RR′), and (dmpe) 2 Ni 2 (C 2 R 2 ) 2 (R.R′ = H, Me, Ph). Structural assignments were made on the basis of 1 H, 13 C, and 31 P NMR data. The crystal and molecular structure of (dmpe)Ni(C 2 Ph 2 ) (17) has been determined by X-ray crystallography.
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Porschke et al. (1985) studied this question.