VERFAHREN ZUR HERSTELLUNG VON CARBAMATEN.

摘要

Prodn. of carbamates is effected by reacting an aromatic nitro cpd. with an organic hydroxy cpd. and CO in the presence of a catalyst system comprising: (a) Pd and/or a Pd cpd.; (b) a ligand of formula (I): where X and Y are bridging gps. with 3-4 atoms in the bridge, including at least two C atoms, and are opt. linked to each other by a connection other than that formed by the C atoms ahown in formula (I); and (c) a cpd. of formula MZ, where M = CU, Fe, V, Cr, Zn, Sn, U or Ce and Z is an anion of a non-hydrohalic acid with a pK of less than 2.