| 摘要 |
<p>Vapor phase chlorination of 2,6-dichloropyridine produces 2,3,6-trichloropyridine selectively over isomeric 2,4,6-trichloropyridine and of 2,3,6-trichloropyridine produces 2,3,5,6-tetrachloropyridine in high selectivity over isomeric 2,3,4,6-tetrachloropyridine at temperatures of 300°C to 450°C. The products are intermediates for insecticides and herbicides.</p> |
