text: Carbamate esters also arise via alcoholysis of carbamoyl chlorides:
  :RNC(O)Cl + ROH → RNCOR + HCl
  Alternatively, carbamates can be formed from chloroformates and amines:
  :ROC(O)Cl + RNH → RNCOR + HCl
  Carbamates may be formed from the Curtius rearrangement, where isocyanates formed are reacted with an alcohol.
  :RCON → RNCO + N
  :RNCO + R′OH → RNHCOR′