in diethyl ether; benzene byproducts: LiCl; addn. of SnCl4 in benzene under exclusion of air and moisture to a soln. of LiN(CH3)2 in ether; refluxion for 4 h; filtration;; distn. of the solvent; distn. of the residue in high vac.;;

in neat (no solvent) decompn. under protection gas (Ar, N2) or in vac. by effect of light for a longer period of time;;

in not given

reaction at 50°C in hydrocarbon solvents; elem. anal.;