1: tri-n-butylamine hydrochloride With sodium hydroxide in water; xylene pH=12; 40 percent aq. NaOH; 2: 1H-imidazole; phosgene in xylene T=65°C; 1 h; Phosgene was passed over the mixture at 72-83 degree;C over 30 minUnder Ar;
Sheludyakov, V. D.; Sheludyakova, S. V.; Kuznetsova, M. G.; Silkina, N. N.; Mironov, V. F.
J. Gen. Chem. USSR (Engl. Transl.), 1980 , vol. 50, # 4 p. 875 - 881,705 - 711
