作者:Giancarlo Cravotto、Luisa Boffa、Marco Bia、Werner Bonrath、Massimo Curini、Georgios Heropoulos
DOI:10.1055/s-2006-951481
日期:2006.9
Chemoselective reduction of nitroarenes to azo and azoxy compounds was easily achieved using zinc powder and ammonium chloride in DMF or DMF-water (95:5) under high intensity ultrasound (US) or microwave (MW) irradiation, separately or combined. When carried out under conventional heating the reaction required much higher temperatures and gave lower yields. The addition of a small amount of water caused a dramatic increase in the reactivity, permitting the reduction of hindered nitroarenes at the expense of selectivity. A novel reactor for combined US/MW irradiation was employed which demonstrated additional beneficial effects.
利用锌粉和氯化铵在DMF或DMF-水(95:5)中,在高强度超声(US)或微波(MW)辐照下,分别或结合地很容易实现对硝基芳烃的化学选择性还原成偶氮和偶氮氧化物。当在常规加热下进行反应时,需要更高的温度且产率较低。添加少量水显著提高了反应性,使得在牺牲选择性的情况下可以还原受阻的硝基芳烃。采用了一种新型反应器用于联合US/MW辐照,显示出额外的有益效果。