Aryliminodimagnesium Reagents. XIX. Effects of Miscellaneous Metal Halides on Oxidative Self-Coupling of the Reagent, and on Its Condensation with Nitrobenzene. A New Preparative Route to<i>o</i>,<i>o</i>′-Dihydroxyazobenzene
作者:Masao Okubo、Haruko Shiku
DOI:10.1246/bcsj.64.196
日期:1991.1
Fourteen metal halides (MXn) were each added to the solutions of aryliminodimagnesium (p-RC6H4N(MgBr)2, IDMg) in tetrahydrofuran, and the effect of MXn on relative yields of products was examined in the following three IDMg reactions: (A) oxidative coupling leading to symmetrical azobenzene, (B) condensation with nitrobenzene, and (C) condensation with o-hydroxy-substituted (o-HO) nitrobenzene. Reaction
将十四种金属卤化物 (MXn) 分别加入芳基亚氨基二镁 (p-RC6H4N(MgBr)2, IDMg) 的四氢呋喃溶液中,并在以下三个 IDMg 反应中检查 MXn 对产物相对产率的影响:(A)氧化偶合导致对称偶氮苯,(B)与硝基苯缩合,(C)与邻羟基取代(o-H2O)硝基苯缩合。CuCl2的加入促进了反应A的反应,而NiCl2或CdCl2的加入提高了反应B中偶氮苯的产率。通过添加 CdCl 2 类似地修改反应 C 以提高邻-HO-偶氮苯的产率。它们的乙酰衍生物经历了偶氮氧的轻松光诱导迁移,并连续水解得到双齿螯合剂,o,o'-(HO)2-偶氮苯。