| abstract |
A B S T R A C T PREPARATION OF CARBAMATES Process for the preparation of carbamates and/or derivatives thereof by reacting an organic compound containing at least one hydroxyl group with carbon monoxide and an organic nitrogenous compound in the presence of a catalytic system based on palladium and a ligand according to the general formula: (I) wherein L = N, P, As, or Sb; R, R1, R and R3 are (un)substituted alkyl, aryl, alkaryl or aralkyl or R and R1 and/or R2 and R3 may form a ring together with the atom L to which they are attached; R4 and R5 are H or lower alkyl and n = 2, 3 or 4, whereas carbon atoms between the groups L may be part non-cyclic or non-cyclic un-saturated structures, optionally in the presence of an acid. |