| 摘要 |
1,241,869. 4 - Hydroxy - 2,3,5 - dichloropyridine. IMPERIAL CHEMICAL INDUSTRIES Ltd. 10 Feb., 1970 [25 Feb., 1969] No. 9954/69. Heading C2C. 4 - Hydroxy - 2,3,5 - tetrachloro - pyridine is prepared by reaction of 4-hydroxy-2,3,5,6- tetrachloropyridine with an alkyl lithium in a liquid diluent at up to 20‹ C. and hydrolysing the product Reaction is preferably effected under an inert gas, e.g. nitrogen. |
