119458-72-9

Upstream product

• 38464-23-2 3,4-diamino-2H-1-benzopyran-2-one 
• 38464-21-0 4-amino-3-nitro-2H-1-benzopyran-2-one 
• 38464-20-9 4-chloro-3-nitro-chromen-2-one 
• 119458-66-1 [4-(2-Hydroxy-phenyl)-[1,2,5]thiadiazol-3-yl]-piperidin-1-yl-methanone 
• 119458-68-3 4-(2-hydroxyphenyl)-1,2,5-thiadiazole-3-carboxylic acid hydrazide 
• 119458-62-7 4-(2-hydroxyphenyl)-1,2,5-thiadiazole-3-carboxylic acid amide 
• 75204-42-1 4H-<1>benzopyrano<3,4-c><1,2,5>thiadiazole-4-one 

Relevant academic research and scientific papers

Synthesis of 4H-Benzopyranothiadiazol-4-one and Its Reactions with Some Nucleophilic and Electrophilic Agents

The reaction of 3,4-diaminocoumarin with thionyl chloride gave 4H-benzopyranothiodiazol-4-one (II), which was cleaved by the action of nucleophilic agents to the corresponding 4-(2-hydroxyphenyl)-1,2,5-thiadiazole-3-carboxylic acid derivatives.The nitration of II leads to the 8-nitro or 6,8-dinitro derivative; the latter was isolated in the form of 4-(2-hydroxy-3,5-dinitrophenyl)-1,2,5-thiadiazole-3-carboxylic acid.