6657-04-1

Basic information

• Product Name: 4-hydroxy-2-chloroazobenzene
• Synonyms: 4-hydroxy-2-chloroazobenzene
• CAS NO: 6657-04-1
• Molecular Weight: 232.669
• Mol File: 6657-04-1.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: 4-hydroxy-2-chloroazobenzene(CAS DataBase Reference)
• NIST Chemistry Reference: 4-hydroxy-2-chloroazobenzene(6657-04-1)
• EPA Substance Registry System: 4-hydroxy-2-chloroazobenzene(6657-04-1)

Safety Data

• Hazardous Substances Data: 6657-04-1(Hazardous Substances Data)

Upstream product

• 108-43-0 3-monochlorophenol 
• 100-34-5 benzene diazonium chloride 
• 369-57-3 benzenediazonium tetrafluoroborate 
• 1956-97-4 2-chlorobenzenediazonium tetrafluoroborate 
• 2684-02-8 benzenediazonium 

Downstream Products

• 219735-98-5 2-chloro-1-iodo-4-methoxybenzene 
• 29242-84-0 2-chloro-4-methoxyaniline 
• 38501-84-7 5-((2-chlorophenyl)diazenyl)-2-hydroxybenzaldehyde 

Relevant articles and documents

Regioselectivity of the methanolysis of polychlorinated biphenyls

Regioselectivity of the methanolysis of lower polychlorinated biphenyls with sodium methoxide in a mixture of methanol and DMSO at 100–130°С was studied. It was found that 2,4,4'-tricholobiphenyl is much more reactive than 2,4-dichlorobiphenyl. This results in different mechanisms of substitution. 2,4-Dichlorobiphenyl reacts with sodium methoxide by the elimination–addition mechanism to form four monosubstitution products in comparable quantities. 2,4,4'-Trichlorobiphenyl reacts with the methodixe ion by the classical SNAr mechanism, with preferential substitution of the 2-chlorine atom.