| abstract |
6-Trifluoro-, 6-chlorodifluoro- and 6-difluoromethyl-2-hydroxypyridines are prepared by decarboxylating the corresponding nicotinic acid at a temperature above 190{C at normal atmospheric pressure. 6-Trifluoro-, 6-chlorodifluoro- and 6-difluoromethyl-2-hydroxy-nicotinic acids are novel compounds and are prepared by hydrolyzing the corresponding nicotinic acid ester or amide or the corresponding nitrile. The pyridines are useful chemical intermediates in the preparation of agricultural products. A process for the preparation of a compound of formula CF 2 XCOCH=CHOR 3 is also disclosed. |