作者:Piotr Lulinski、Lech Skulski
DOI:10.1246/bcsj.70.1665
日期:1997.7
An easy and cheap laboratory method is presented for the direct mono- and diiodination of a number of activated and deactivated arenes. The main iodination reactions occurred at the temperatures not exceeding 65 °C for 0.5—12 h in the anhydrous, strongly acidic liquid system, I2/AcOH/Ac2O/H2SO4, in the presence of prior dissolved CrO3 used as the oxidant. The yields of the pure iodinated products varied from 31% (for 3,5-diiodobenzoic acid) up to 90% (for 4-iodoanisole). So far, benzonitrile and some oxidizable aromatics, e.g. naphthalene, fluorene, xanthene, and thiophene, have been found to be unsuitable for the effective iodination. Nevertheless, this novel, simple method of direct iodination is worthy to be extended to other appropriate aromatics.
提出了一种简单且便宜的实验室方法,用于许多活性和非活性芳香烃的直接单碘化和双碘化。主要的碘化反应在不超过65°C的温度下进行,反应时间为0.5至12小时,在无水的强酸性液体体系I2/AcOH/Ac2O/H2SO4中进行,同时加入预先溶解的CrO3作为氧化剂。纯碘化产物的产率从31%(对于3,5-二碘苯甲酸)到90%(对于4-碘乙醚)不等。至今,苯腈和一些可氧化的芳香族化合物,如萘、萘烷、黄烷和噻吩,被发现不适合有效碘化。然而,这种新颖、简单的直接碘化方法值得推广到其他适合的芳香族化合物。