申请人:Souda Hiroshi
公开号:US20050113581A1
公开(公告)日:2005-05-26
There is provided a process for preparing a carboxylic acid ester of formula (3): R
2
COOR
1
(3)
wherein R
1
is an 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 R
2
is
an 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):
R
1
OH (1)
wherein R
1
is as defined above, with a zirconium compound of formula (6):
Zr(OR
8
)
4
(6)
wherein R
8
is an alkyl group or an aryl group which may be substituted and is not the same as R
1
, to prepare a zirconium catalyst, and reacting a carboxylic acid of formula (2):
R
2
COOH (2)
wherein R
2
is as defined above, with the monohydroxy compound of formula (1) in the presence of the zirconium catalyst.
提供了一种制备化学式为(3)的羧酸酯的方法:R2COOR1 (3),其中R1是可以被取代的烷基、可以被取代的烯基、可以被取代的炔基、可以被取代的芳基或可以被取代的杂芳基烷基,R2是可以被取代的烷基、可以被取代的烯基、可以被取代的炔基、可以被取代的芳基、可以被取代的杂芳基、可以被取代的芳基烷基或可以被取代的杂芳基烷基。该方法的特征在于将化学式为(1)的单羟基化合物:R1OH (1)(其中R1如上定义)与化学式为(6)的锆化合物反应:Zr(OR8)4 (6)(其中R8是可以被取代的烷基或芳基,且不同于R1),制备锆催化剂,然后在锆催化剂存在的情况下,将化学式为(2)的羧酸:R2COOH (2)(其中R2如上定义)与化学式为(1)的单羟基化合物反应。