| abstract |
An improved process is disclosed for preparing known N-(arylsulphonyl)-carbamic acid derivates (carbamide, carbamate and thiocarbamate) having the formula (I), in which Ar can be an aryl group, Z can be N, S or O and R?4 and R5¿ can be different aliphatic, cycloaliphatic or aromatic groups. To produce these compounds, arlsulphonylimines having the general formula (II): ArSO¿2?N=XR?1R2R3¿, in which R?1, R2 et R3¿, independently from each other, designate C¿1-12?-alkyl, cyclohexyl, optionally substituted benzyl, phenyl or naphthyl; and X stands for an atom of phosphorus, arsenic, antimony, sulphur, selenium, tellurium or iodine, are catalytically carbonylated with CO and the resulting arylsulphonyl isocyanate having the formula (III): ArSO2NCO is reacted during or after carbonylation with compounds having the general formula (IV): R?4R5¿ZH. |