CYCLOTRIMERIZATION OF ARYL ISOCYANATES CATALYZED BY ALKOXYALLENES THROUGH ZWITTERIONIC MECHANISM

被引：22

作者：

MIZUYA, J ^{[1
]}

YOKOZAWA, T ^{[1
]}

ENDO, T ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,RESOURCES UTILIZAT RES LAB,NAGATSUTA,MIDORI KU,YOKOHAMA,KANAGAWA 227,JAPAN

来源：

JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY | 1991年 / 29卷 / 11期

关键词：

D O I：

10.1002/pola.1991.080291103

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Alkoxyallenes (1) are found to catalyze cyclotrimerization of aryl isocyanates (2) in dimethylformamide (DMF) to afford 1,3,5-triaryl-s-triazine-2,4,6-trione (3: cyclic trimer of 2), although the reaction of 1 with 2 in bulk gave the corresponding copolymer. In order to speculate about the mechanism of the cyclotrimerization, macrozwitterion 4 was prepared by copolymerization of 1 and 2 in bulk, and the catalytic activity of 4 was further studied. Cyclotrimerization of 2 was promoted by 4 and quenching of 4 with methanol completely destroyed the catalytic activity. Consequently, the alkoxyallene-catalyzed cyclotrimerization of 2 is assumed to take place through a zwitterion generated from 1 and 2.

引用

页码：1545 / 1548

页数：4

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