40756-56-7

Upstream product

• 78411-58-2 5-(2-methoxyphenyl)-1-(2-nitrophenyl)tetrazole 
• 273-02-9 2H-benzo[d][1,2,3]triazole 
• 67-56-1 methanol 
• 1916-72-9 2-phenyl-2H-1,2,3-benzotriazole 
• 612-29-3 o-nitronitrosobenzene 
• 90-04-0 2-methoxy-phenylamine 
• 114461-92-6 2-methoxy-2'nitroazobenzene 

Downstream Products

• 10096-91-0 2-(2-Hydroxyphenyl)-2H-benzotriazole 

Relevant academic research and scientific papers

Palladium-catalyzed ortho-alkoxylation of 2-aryl-1,2,3-triazoles

Palladium-catalyzed alkoxylation of 2-aryl-1,2,3-triazoles was described in the presence of various groups in the aromatic rings. In addition, some other directing groups of heterocycles containing nitrogen were explored.

The Reaction of Some o-Nitroazobenzenes with Hydroxylamine

The reaction of some representative o-nitroazobenzenes with hydroxylamine in ethanolic sodium hydroxide solution gave good to excellent yields of the corresponding 2-aryl-2H-benzotriazole 1-oxides.In some cases, the corresponding parent 2-aryl-2H-benzotriazoles were also obtained.Under the same reaction conditions, nitrobenzene was essentially unreactive.It Is suggested that the reactive species is diimide.

Preparation of Some 2-(Methoxyphenyl)-2H-benzotriazoles and the Corresponding Hydroxyphenyl Compounds

The reaction of several substituted o-nitronitrosobenzenes with o- and p-anisidine, and 2,4-dimethoxyaniline in acetic acid gives in good yield the corresponding o-nitroazobenzenes which are readily reduced with thiourea dioxide (formamidinesulfinic acid) to the corresponding 2-(methoxyphenyl)-2H-benzotriazoles, demethylation of which furnished the corresponding 2-(hydroxyphenyl)-2H-benzotriazoles.Demethylation of the dimethoxy derivatives was best accomplished with boron tribromide in methylene chloride, the methoxy group located ortho to the benzotriazole ring beingdemethylated more readily than is the para-methoxy group.The reaction of 0-nitroazobenzenes containing a methoxy group with hydrobromic acid in acetic acid results in cleavage of the azo bond and also partial bromination to give o-nitroaniline and some of its brominated derivatives.

New Synthesis of Benzotriazole Photostabilizers

1-(2-Nitrophenyl)-5-aryltetrazoles and 1-aryl-5-(2-nitrophenyl)tetrazoles are converted into 2-arylbenzotriazoles by the action of heat, the former reacting much faster than the latter.By appropriate use of methoxyl groups, useful benzotriazole ultraviolet absorbers may be synthesized conveniently by this method.