22358-67-4

Upstream product

• 150-76-5 4-methoxy-phenol 
• 88-74-4 2-nitro-aniline 
• 119-66-4 2-nitrobenzenediazonium chloride 

Downstream Products

• 25729-32-2 2-(2H-benzo[d][1,2,3]triazol-2-yl)-4-methoxyphenol 
• 31701-42-5 2-(2'H-benzotriazol-2'-yl)benzene-1,4-diol 

Relevant academic research and scientific papers

Method for producing 2-(2'-hydroxy 5'-methoxyphenyl)benzotriazole

The invention relates to a method for preparing a benzotriazole ultraviolet light absorber, in particular to a method for preparing 2-(2'-hydroxyl 5'-methoxyphenyl) benzotriazole, which comprises thefollowing steps: reacting o-nitroaniline with alkali metal nitrite under the conditions of inorganic strong acidity and low temperature to synthesize diazonium salt; dissolving p-methoxyphenol in an aliphatic solvent under an alkaline condition, and coupling p-methoxyphenol with diazonium salt under a low-temperature condition to obtain an azo compound; producing a semi-reduction product from theazo compound under an alkaline condition under the action of a reducing agent; and reacting the semi-reduction product in an organic solvent under the action of a metal reducing agent to obtain the product. Due to the adoption of the preparation method, the preparation of the ultraviolet light absorber 2-(2'-hydroxyl 5'-methoxyphenyl)benzotriazole is simpler, the content is high, the yield is high, no pollution is caused, and the barrier rate is high.

OPTICAL MATERIAL COMPRISING A RED-SHIFTED BENZOTRIAZOLE UV ABSORBER

The present invention relates to an eyeglass lens comprising a substrate made of an optical material comprising a polymer matrix and at least one 2-(2-hydroxy-5-R1-phenyl)benzotriazole, in which R1 is a resonant group, the optical tr

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.