| 摘要 |
<p>The novel compound 2,3-dichloro-5-iodopyridine is prepared by chlorinating 3-chloro-5-iodo-2-pyridinol or by lithiating 2-bromo-2,3-dichloropyridine at a reduced temperature and thereafter iodinating the thus produced lithiopyridine. The compound 2,3-dichloro-5-iodopyridine is useful as a chemical intermediate in the preparation of pyridyloxyphenoxypropionic acids, and esters and amides thereof, which are valuable herbicides. The 2,3-dichloro-5-lithiopyridine and 3-chloro-5-iodo-2-pyridinol intermediates are also novel.</p> |
