The Synthesis of Four Isomeric Diiodo-<i>m</i>-xylenes. Their Isomerization in Sulfuric and Polyphosphoric Acids
作者:Hitomi Suzuki、Kazuhiro Maruyama、Ryozo Goto
DOI:10.1246/bcsj.38.1590
日期:1965.10
isomerization in concentrated acids investigated in order to elucidate the mechanism of the new rearrangement observed in the Jacobsen reaction of 2-iodo-m-xylene. 2,4- and 4,5-Diiodo-m-xylene, in the presence of cold sulfuric or hot polyphosphoric acid, isomerize to 4,6- and 2,5-diiodo-m-xylene respectively. All four isomers readily undergo disproportionation with hot sulfuric acid to give mixtures of tri-
已合成了四种异构二碘间二甲苯,并研究了它们在浓酸中的异构化,以阐明在 2-碘间二甲苯的雅各布森反应中观察到的新重排机制。2,4- 和 4,5- 二碘间二甲苯在冷硫酸或热多磷酸存在下,分别异构化为 4,6- 和 2,5- 二碘间二甲苯。所有四种异构体都容易与热硫酸发生歧化反应,得到三和四碘间二甲苯的混合物。在与多磷酸的反应中未观察到歧化。已经讨论了磺基在该反应中所起的重要作用。