| 摘要 |
<p>This invention is directed to a process for preparing a carbamate from an organic carbamate and an aromatic amine in the presence of catalytic quantities of a Lewis acid catalyst. The Lewis acid catalyst is soluble in the reaction mixture at the reaction conditions employed and is at least one member of the group consisting of a zinc or divalent tin halide, a zinc or divalent tin salt of a monovalent organic compound which has a pKa value of at least 2.8, and a zinc or divalent tin salt of trifluoroacetic acid. 28,594-F</p> |
