Abstract
A new mechanism of the transformation of amine hydrochlorides into isocyanates during the phosgenation process was proposed on the basis of radioisotope exchange between p,p'-diamino-1,2-diphenylethane dihydrochloride (36Cl) and phosgene. The reaction proceeds through a transition complex of amine hydrochloride and phosgene, formed on the surface of the hydrochloride crystals.
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