| 摘要 |
FIELD: chemical industry. SUBSTANCE: claimed invention describes chloropyridinium chlorides of general formula (I):wherein R, , Rand Rare as defined in claim 1 which are prepared by reacting enamides of general formula (II):wherein R, Rand Rare as defined above, with chlorinating agent in the present of formamide derivative of general formula (III):wherein Rand Rare as defined in claim 2, optionally in the presence of diluent at temperatures between -30 C and +100 C. CHloropyridinium chlorides of formula (I) given above may be used as starting product for preparation of chloropyridines of formula (IV) given in claim 3 by thermal cleavage. EFFECT: more efficient process for preparation of chloropyridinium. |
