Nitration of thiacalix[4]arene derivatives

被引：22
|
作者：
Lhoták, P
Svoboda, J
Stibor, I
Sykora, J
机构：
[1] Inst Chem Technol, Dept Organ Chem, CR-16628 Prague 6, Czech Republic
[2] Acad Sci Czech Republ, Inst Chem Proc Fundamentals, CR-16502 Prague, Czech Republic
来源：
TETRAHEDRON LETTERS | 2002年 / 43卷 / 41期
关键词：
D O I：
10.1016/S0040-4039(02)01667-2
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
A direct nitration of the upper rim of thiacalix[4]arenes is not possible due to the undesirable oxidation of the sulphur atoms during the nitration step leading to very complicated reaction mixtures. On the other hand, thiacalix[4]arene derivatives can be at first transformed intentionally to the highest oxidation state-sulfones, and subsequently ipso-nitrated using 100% HNO3 in CF3COOH. This procedure gives smoothly mono- or dinitro-derivatives in acceptable yields which opens the way for further derivatisation of the upper rim of thiacalixarenes. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：7413 / 7417
页数：5
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