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);

1: H2SO4 conc., NaNO2 / 1.5 h / 0 °C 2: acetic anhydride / 1 h / 90 °C / 1.) 1.5h, 0 deg C, 2.) 1h, 90 deg C View Scheme

Erhitzen des Reaktionsprodukts mit Acetanhydrid;