iron(III) chloride; carbon; hydrazine hydrate in butan-1-ol T=100 - 105°C;

hydrogenchloride; tin(ll) chloride

1: Calcium carbimide; methyl chloroformate in water T=38 - 41°C; 1 h; 2: 3,4,4'-triaminodiphenyl sulfide in water; acetic acid; isopropyl alcohol 6 h; Heating;