Department OJ" lndustrial Chernisty Faculty of Engineering, Kanto Gakuin Universio Mutsuuru, Kcinux~ wa-ku, Yokohamci 236, JAPAN lsothiocyanates have been prepared mainly (a) by the reaction of primary amines with thie phosgene,'(b) the decomposition of 1, 3-disubstituted thiourea with acid?(c) by the decomposition of dithiocarbamates from primary amines and carbon disulfide in the presence of heavy metal salts? or N, N'- ...