反应详情

2,3,6-Trichloropyridine is obtained, for example, in the chlorination of 2,6-dichloropyridine (EP Patent 239,904), in the treatment of pentachloropyridine with hydrazine in ethanol/triethylamine and sodium hydroxide solution (U.S. Pat. No. 3,947,457), and selectively in the reduction of pentachloropyridine with lithium aluminum hydride (F. Binns, S.M. Roberts, H. Suschitzky, J. Chem. Soc. C, (1970) (10), 1375-1380; J. Chem. Soc. D (1969) (20), 1211-1212). 2,3,5,6-Tetrachloropyridine can also be obtained in this way if less reductant is employed.