Products from the Nitration of 2,5-Dimethylthiophene and Its 3,4-Dibromo Derivative. Two Modes of the Formation of Dithienylmethanes
作者:Hitomi Suzuki、Ichiro Hidaka、Akemi Iwasa、Tadashi Mishina、Atsuhiro Osuka
DOI:10.1246/bcsj.54.771
日期:1981.3
The reaction of 2,5-dimethylthiophene with copper(II) nitrate in acetic anhydride gave 3-nitro-2,5-dimethyl-thiophene and 2,5-dimethyl-3-(5-methyl-2-thenyl)thiophene as major isolable products. The treatment of 3,4-dibromo-2,5-dimethylthiophene with nitric acid (d=1.5) in dichloromethane in the presence of a catalytic amount of sulfuric acid afforded 3,4-dibromo-5-methyl-2-(nitrooxymethyl)thiophene
2,5-二甲基噻吩与硝酸铜(II)在乙酸酐中反应得到 3-硝基-2,5-二甲基-噻吩和 2,5-二甲基-3-(5-甲基-2-苯基)噻吩作为主要化合物可分离的产品。在催化量的硫酸存在下,在二氯甲烷中用硝酸(d=1.5)处理 3,4-二溴-2,5-二甲基噻吩,得到 3,4-二溴-5-甲基-2-(硝基氧甲基)噻吩,在以己烷为洗脱剂的硅胶薄层色谱上,通过失去一个亚甲基碳原子进行部分新颖的偶联反应,从而得到 3,3',4,4'-tetrabromo-5 ,5'-二甲基二-2-噻吩基甲烷以及预期的 3,4-二溴-2-羟甲基-5-甲基噻吩和双(3,4-二溴-5-甲基-2-苯基)醚。