(4). Hydrolyzable Chlorine

        carbamyl chloride and phosgene in diisocyanates

         COCl₂ + H₂O ---> 2HCl + CO₂

         RNHCOCl ---> RNCO + HCl

         RNCO + H₂O ---> RNHCOOH ---> RNH₂ + CO₂

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