The present invention relates to silica-based heterogeneous zinc compounds which are suitable as catalysts in the reaction of amines with dialkyl carbonates to produce carbamates. The catalysts have the formula [SiO2]-CH2-CHR-X-COOZn[Y], wherein [SiO2] represents a silica carrier selected from the group consisting of ordered mesoporous silica and irregular amorphous narrow pore silica, R represents a moiety selected from the group consisting of hydrogen, -CH3, and -CH2CH3, preferably hydrogen, X is an aliphatic chain of 2 to 11 carbon atoms that optionally comprises ether moieties and [Y] represents a mono anion. The invention is also directed towards a method for the preparation of the aforementioned compounds and towards method for the alkoxycarbonylation of amines.
本发明涉及
硅基杂化
锌化合物,适用于作为催化剂在胺与二烷基
碳酸酯反应中产生
氨基甲酸酯。催化剂的
化学式为[SiO2]-
CH2-CHR-X-COOZn[Y],其中[SiO2]代表从有序介孔
硅和不规则非晶窄孔
硅组成的
硅载体,R代表从氢、-
CH3和- 组成的基团,优选为氢,X是由2至11个碳原子组成的脂肪链,可选地包含醚基团,[Y]代表单阴离子。该发明还涉及上述化合物的制备方法以及胺的烷氧羰基化方法。