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- W2067463876 abstract "On chlorinating pyridine in the gas phase at 270° a good yield of 2-chloropyridine is obtained together with a small quantity of 2:6-dicloropyridine. At 400° the main product is 2:6-dichloropyridine. It is shown that among the products produced in the chlorination at 270°, a small amount of a pyridylpyridinium compound must be present, for 2-aminopyridine is obtained on hydrolysis of the reation product. Chlorination in the gas phase takes place very slowly at about 200° at this temperature 3:5-dichloropyridine is obtained together with 3:4:5-trichloropyridine. On chlorinating fused pyridine hydrochloride at about 170° a considerable yield of 3:5-dichloropyridine is produced along with a small amount of 3:4:5-trichloropyridine and pentachloropyridine. Thus in the chlorination of pyridine a specific temperature effect on the type of substitution is observed as in the bromination of pyridine. In the chlorination, the temperature limits for both types of substitution lie near together. 2-Aminopyridine is obtained on heating 2-chloropyridine with aqueous ammonia and copper sulphate. 2-Amino-6chloropyridine is obtaines on heating 2:6-dichloropyridine with aqueous ammonia." @default.
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- W2067463876 date "2010-09-03" @default.
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- W2067463876 title "The chlorination of pyridine: Investigations on pyridine and quinoline derivatives 41st. Communication" @default.
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- W2067463876 doi "https://doi.org/10.1002/recl.19390580808" @default.
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