C6H5CCC(CH3)3 in hexane (Ar); heating at reflux mixt. of gallium compd. and acetylene deriv. for15 h; detected by NMR among other products;

in hexane (Ar); soln. of Ga compd. and alkyne in hexane was treated with amine at room temp.; stirred under reflux for 16 h; cooled to room temp.; decanted; washed (hexane); crystd. (cyclopentane);elem. anal.;

in hexane under Ar; soln. of (t-Bu)2GaH in n-hexane added to soln. of C6H3(C2CMe3)3 in n-hexane at room temp.; heated under reflux for 16 h; filtered; filtrate concd. under vac. at room temp.; ppt. collected; recrystd.;