72235-24-6

Upstream product

• 52469-45-1 2-(4-nitro-phenyl)-naphtho[1,2-d]oxazole-5-sulfonic acid 
• 555-16-8 4-nitrobenzaldehdye 
• 5959-58-0 1-amino-2-naphthol-4-sulfonic acid monosodium salt 
• 116-63-2 1-amino-2-naphthol-4-sulfonic acid 

Downstream Products

• 72234-67-4 2-(4-nitro-phenyl)-naphtho[1,2-d]oxazole-5-sulfonic acid pyridin-3-ylamide 
• 72234-66-3 2-(4-nitro-phenyl)-naphtho[1,2-d]oxazole-5-sulfonic acid pyridin-2-ylamide 
• 72234-81-2 2-(4-nitro-phenyl)-naphtho[1,2-d]oxazole-5-sulfonic acid 4-nitro-phenyl ester 
• 75510-95-1 2-(4-nitro-phenyl)-naphtho[1,2-d]oxazole-5-sulfinic acid 
• 72234-70-9 2-(4-nitro-phenyl)-naphtho[1,2-d]oxazole-5-sulfonic acid 4-phenyl-thiazol-2-ylamide 
• 72234-71-0 2-(4-nitro-phenyl)-naphtho[1,2-d]oxazole-5-sulfonic acid 4-p-tolyl-thiazol-2-ylamide 
• 72234-80-1 2-(4-nitro-phenyl)-naphtho[1,2-d]oxazole-5-sulfonic acid phenyl ester 

Relevant academic research and scientific papers

Naphthoxazole Intermediates in the Preparation of 3-Hydroxy-4-(1-alkyl-3-methyl-5-hydroxy-4-pyrazolyl>-azo-1-naphthalenesulfonamide Dyes

Acylation of 4-amino-3-hydroxy-1-naphthalenesulfonic acid (3) with benzoyl chloride in pyridine gave pyridinium 3-hydroxy-4-(N-benzoylamino)-1-naphthalenesulfonate (12) which was converted by thionyl chloride followed by diethylamine into N,N-diethyl-2-phenylnaphthoxazole-5-sulfonamide (14).The naphthoxazole moiety was hydrolyzed with potassium hydroxide and the resulting N,N-diethyl-4-amino-3-hydroxy-1-naphthalenesulfonamide (11) coupled with 1-alkyl-3-methyl-5-pyrazolones.The 2-phenylnaphthoxazole intermediates and various by-products were investigated.