Esters are prepared from hydroxyl-containing compounds and carboxylic acids or anhydrides or lower alkyl esters thereof using a multiple catalyst approach, wherein a first catalyst such as an organotin catalyst can be present at the beginning of the reaction and a second catalyst such as an organotitanium catalyst can be added any time after the addition of the first catalyst, or when the acid value of the reaction mixture falls below a predetermined acid value. The second catalyst can be added multiple times, and a third or additional catalysts can also be used.
酯类化合物是通过使用多催化剂方法从含羟基化合物和
羧酸或酐或其低烷基酯制备的,其中第一催化剂,如
有机锡催化剂,可以在反应开始时存在,第二催化剂,如
有机钛催化剂,可以在添加第一催化剂后的任何时间添加,或者当反应混合物的酸值降至预定酸值以下时添加。第二催化剂可以多次添加,并且还可以使用第三或更多的催化剂。