摘要:
An inert fluid of high chemical stability which comprises a perfluorinated cyclic ether having the formula C.sub.10 F.sub.20 O, and its preparation by perfluorination of the corresponding ethylenically-unsaturated cyclic ether C.sub.10 F.sub.18 O with cobalt trifluoride, electrochemically or with fluorine gas.
摘要:
2-Chloro-5-trifluoromethylpyridine or a 2-Chloro-5-perchlorofluoromethylpyridine is prepared by chlorination of 3-trifluoromethylpyridine or a 3-perchlorofluoromethylpyridine respectively in the liquid phase in the presence of ultra-violet radiation and/or in the presence of a free-radical initiator.
摘要:
2-Chloro-5-trifluoromethylpyridine or a 2-chloro-5-perchlorofluoromethylpyridine is prepared by chlorination of 3-trifluoromethylpyridine or a 3-perchlorofluoromethylpyridine respectively in the vapor phase at a temperature in the range from 100.degree. C. to 500.degree. C.
摘要:
Side-chain fluorination of 3-methylpyridine is carried out by reaction with hydrogen fluoride and chlorine in the liquid phase. The main products are 3-trifluoromethylpyridine, 3-chlorodifluoropyridine and 3-difluoromethylpyridine.
摘要:
3-Chloro-5-trifluoromethylpyridine and/or 2,3-dichloro-5-trifluoromethylpyridine are produced by selective vapor-phase chlorination of 3-trifluoromethylpyridine or 2-chloro-5-trifluoromethylpyridine in the presence of a copper catalyst.
摘要:
3-Trichloromethylpyridines are produced from 3-methylpyridines by reaction with chlorine in the vapor phase in the presence of a metal oxide or metal halide catalyst.
摘要:
2-chloro-5-trifluoromethylpyridine or a 2-chloro-5-perchlorofluoromethylpyridine is prepared by chlorination of 3-trifluoromethylpyridine or a 3-perchlorofluoromethylpyridine respectively in the liquid phase in the presence of ultra-violet radiation and/or in the presence of a free-radical initiator.