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Synthesis of Tetramethylurea by Phosgene
Tetramethylurea is synlhesed by phosgene.The optimum process conditions are consided.The content of product is 98% and the yield is 95.1%.
Synthesis of Intermediate of 3-Amino-2-Chloro-4-Methylpyridine
This paper introduces nine processes for preparing of 3-amino-2-chloro-4-methylpyridine, the better process was developed and researched, the production content is 99.8%, the yield is 65.4%.