SYNTHESIS, CHARACTERIZATION, AND REACTIVITY OF NEW ALKYLGALLIUM ACETYLIDES

Reaction of Me2GaCl and LiC=CSiMe3 or R2GaCl (R = Me, (t)Bu) and LiC=C Ph (benzene, 70-degrees-C) gives [Me2GaC=CSiMe3]2 and [R2GaC=CPh]2 in 62%, 58%, and 71% yields, respectively. The gallium acetylides were ch aracterized by IR, Raman, and NMR (H-1, C-13, C-13{H-1}) spectroscopy. Reactions of the dimethylgallium acetylides and phosphines (R2PH; R=E t, (i)Pr) (toluene, 110-20-degrees-C) give HC=CSiMe3 or HC=CPh and the corresponding dimethylgallium dialkylphosphides [Me2GaPR2]n (R=Et, n= 3, (i)Pr, n=2).