16046-28-9

Basic information

• Product Name: Benzenesulfonic acid,4-methyl-, 2-oxido-2-phenyldiazenyl ester
• Synonyms: Benzenediazo-p-toluenesulfonate,N'-oxide (8CI); Diazene, [[(4-methylphenyl)sulfonyl]oxy]phenyl-, 2-oxide (9CI);Cupferron tosylate
• CAS NO: 16046-28-9
• Molecular Formula: C13H12 N2 O4 S
• Molecular Weight: 292.315
• Mol File: 16046-28-9.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: Benzenesulfonic acid,4-methyl-, 2-oxido-2-phenyldiazenyl ester(CAS DataBase Reference)
• NIST Chemistry Reference: Benzenesulfonic acid,4-methyl-, 2-oxido-2-phenyldiazenyl ester(16046-28-9)
• EPA Substance Registry System: Benzenesulfonic acid,4-methyl-, 2-oxido-2-phenyldiazenyl ester(16046-28-9)

Safety Data

• Hazardous Substances Data: 16046-28-9(Hazardous Substances Data)

Upstream product

• 135-20-6 cupferron 
• 98-59-9 p-toluenesulfonyl chloride 

Downstream Products

• 52123-78-1 N-Phenyl-N'-butyldiimide N-oxide 
• 25370-94-9 N-Phenyl-N'-methoxydiazene N-oxide 
• 52123-65-6 N'-Isopropyl-N-phenyl-diimid-N-oxyd 
• 35150-72-2 2-ethyl-1-phenyldiazene oxide 
• 139215-28-4 2-isopropyl-3-phenyl-2H-indazole 
• 17310-79-1 4-methylazoxybenzene 
• 17478-75-0 N'-(4-methoxy-phenyl)-N-phenyl-diazene-N-oxide 
• 1334951-11-9 2-(4-methoxyphenyl)-3-phenyl-2H-indazole 
• 52123-65-6 (Z)-2-isopropyl-1-phenyldiazene 1-oxide 
• 16054-48-1 (Z)-2-(4-bromophenyl)-1-phenyldiazene 1-oxide 

Relevant articles and documents

Rh(III)-Catalyzed Regio- and Chemoselective [4 + 1]-Annulation of Azoxy Compounds with Diazoesters for the Synthesis of 2H-Indazoles: Roles of the Azoxy Oxygen Atom

A Rh(III)-catalyzed tandem C-H alkylation/intramolecular decarboxylative cyclization of azoxy compounds with diazoesters for the synthesis of 3-acyl-2H-indazoles is disclosed. The azoxy instead of the azo group enables a distinct approach for cyclative capture, leading to a [4 + 1]-annulation rather than a classic [4 + 2] manner. The azoxy oxygen atom is traceless after annulation, and further removal from the product is not required. This reaction features a complete regioselectivity for unsymmetrical azoxybenzenes and a compatibility of monoaryldiazene oxides.