There is provided a process for preparing a carboxylic acid ester of formula (3): R2COOR1 (3)
wherein R1 isan alkyl group which may be substituted,
an alkenyl group which may be substituted,
an alkynyl group which may be substituted,
an aralkyl group which may be substituted, or
a heteroarylalkyl group which may be substituted,
and R2 isan alkyl group which may be substituted,
an alkenyl group which may be substituted,
an alkynyl group which may be substituted,
an aryl group which may be substituted,
a heteroaryl which may be substituted,
an aralkyl group which may be substituted, or
a heteroarylalkyl group which may be substituted,
which process is characterized by the steps of reacting a monohydroxy compound of formula (1):
R1OH (1)
wherein R1 is as defined above, with a zirconium compound of formula (6):
Zr(OR8)4 (6)
wherein R8 is an alkyl group or an aryl group which may be substituted and is not the same as R1, to prepare a zirconium catalyst, and reacting a carboxylic acid of formula (2):
R2COOH (2)
wherein R2 is as defined above, with the monohydroxy compound of formula (1) in the presence of the zirconium catalyst.
提供了一种制备式 (3)
羧酸酯的工艺:R2COOR1 (3)
其中 R1 是一个可被取代的烷基、
可被取代的烯基
可被取代的炔基
可被取代的芳烷基,或
可被取代的杂芳烷基、
R2 是一个可被取代的烷基、
可被取代的烯基
可被取代的炔基
可被取代的芳基
可被取代的杂芳基
可被取代的芳烷基,或
可被取代的杂芳烷基、
该工艺的特点是使式(1)的单羟基化合物发生反应:
R1OH (1)
其中 R1 如上定义,与式 (6)
锆化合物反应:
Zr(OR8)4 (6)
其中 R8 为烷基或芳基,可被取代且与 R1 不同,以制备
锆催化剂,并与式 (2) 的
羧酸反应:
R2COOH (2)
其中 R2 如上定义,在
锆催化剂存在下与式 (1) 的单羟基化合物反应。