iodine; magnesium in neat (no solvent) byproducts: MgI2; inert atm.; heating (80°C, 6 h and 90°C, 1 h); distn.;

in hexane under Ar; soln. of (n-Pr)2GaH (5percent excess) 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;

in hexane under Ar; soln. of (n-Pr)2GaH (5percent excess) in n-hexane added to soln. of C6H4(C2CMe3)2 in n-hexane at room temp.; heated under reflux for 16 h; filtered; filtrate concd. under vac. at room temp.; ppt. collected; recrystd. from n-pentane;

Kinetics; byproducts: C3H6, H2; thermolysis under static conditions, 175.4, 186.0, 193.0, or 203.0°C; reaction monitoring by pressure measurement;