triethylamine in N,N-dimethyl-formamide byproducts: 2(C2H5)3N*HCl; dropise addn. of triethylamine to soln. of α-amino acid and Ge compd. under inert gas; stirring, 12h; filtration under Ar; concn.; pptn.; filtration; recrystn. (benzene-pentan);