申请人:——
公开号:US20030191320A1
公开(公告)日:2003-10-09
The present invention provides a process for the preparation of a compound of formula (I) wherein Y represents —O—, —S— or —N(R
2
)—, R
2
being hydrogen, C
1
-C
10
alkyl or aralkyl; Z represents a 2,5-furanyl, 2,5-thiophenyl, 4,4′-stilbenyl or a 1,2-ethyleny residue and R
1
represents hydrogen, halogen, C
1
-C
10
alkoxyl, cyano, COOM or SO
3
M, M being hydrogen or an alkaline or alkaline earth metal, characterized by reacting a compound of formula (II) with a dicarboxylic acid of formula (III): HOOC-Z-COOH, or an ester thererof, Y, Z and R
1
being as previously defined, in N-methylpyrrolidone or N,N-dimethylacetamide, in the presence of an acidic catalyst and, optionally, in the presence of a secondary solvent capable of removing water from the reaction mixture, which are useful as optical whitening agents for natural and synthetic materials.
本发明提供了一种制备式(I)化合物的方法,其中Y代表—O—、—S—或—N(R2)—,R2代表氢、C1-C10烷基或芳基烷基;Z代表2,5-
呋喃基、2,5-
噻吩基、4,4′-双苯基或1,2-
乙烯基残基,R1代表氢、卤素、C1-C10烷氧基、
氰基、COOM或SO3M,其中M代表氢或碱性或碱土
金属,其特征在于将式(II)化合物与式(III)的二
羧酸:HOOC-Z-COOH或其酯,在
N-甲基吡咯烷酮或N,N-二甲基乙酰胺中,在酸性催化剂的存在下,以及可选地,在能够从反应混合物中除去
水的辅助溶剂的存在下反应,这些化合物可用作天然和合成材料的光学增白剂。