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Preparation method for 3,5-dichloro-2-pyridine alcohol
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Paragraph 0019, (2016/11/14)
The invention discloses a preparation method for 3,5-dichloro-2-pyridine alcohol. The preparation method comprises the following steps: taking 3,5,6-trichloro-2-pyridinol or 3,5,6-trichloro-2-pyridinol sodium as an initial raw material, reducing the initial raw material by zinc powder in an acidic water environment, reacting to obtain 3,5-dichloro-2-pyridine alcohol, cooling, crystallizing, filtering, washing, and drying to obtain a finished product. According to the preparation method, raw materials are easy to obtain; the used reagent is low in toxicity and has low pollution to the environment; purification methods for an intermediate product and a final product are simple and easy to operate; the yield is high.
Halopyridines. I. Synthesis of 3,5-Dichloro-2-pyridone and 2,3,5-Trichloropyridine
Shvekhgeimer, M.-G. A.,Kobrakov, K. I.,Sychev, S. S.,Promonenkov, V. K.
, p. 865 - 867 (2007/10/02)
Trichloroacetonitrile reacts with acrolein to give 2,2,4-trichloro-5-oxopentanonitrile, the cyclization of which to chloropyridines has been examined.