29820-06-2Relevant academic research and scientific papers
A benzotriazole compound synthesis method (by machine translation)
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Paragraph 0060; 0061; 0062; 0063, (2018/03/26)
The invention discloses a synthetic method of a benzotriazoles compound. The synthetic method comprises the following steps: loading a bifunctional catalyst of hydrogenation-solid alkali into a fixed bed reactor; continuously leading a solution of a compound represented by the formula (I) into the fixed bed reactor, leading hydrogen, and performing heating; enabling the reaction liquid to continuously flow out from a lower end of the fixed bed reactor; cooling the effluent reaction liquid to the room temperature; performing gas-liquid separation, liquid filtration, and filtrate condensation to remove the solvent; and performing purification to obtain the benzotriazoles compound represented by the formula (II). The bifunctional catalyst of hydrogenation-solid alkali is adopted for catalytic hydrogenation to synthesize the benzotriazoles compound. The bifunctional catalyst has catalytic performance of solid alkali during catalytic hydrogenation, so that insufficient addition of alkali liquor is effectively avoided in the prior art. The bifunctional catalyst is high in catalytic activity and is convenient to recycle and reuse. Post-treatment of synthesizing the benzotriazoles compound is simplified, and the problem of environmental pollution resulting from post-treatment of the alkali liquor is effectively avoided. The synthetic method is efficient, and is low in cost and easy and simple to operate.
Preparation of Some 2-(2' H-Benzotriazol-2'-yl)phenol Ultraviolet Absorbers: Application of the Transalkylation Reaction
Rosevear, Judi,Wilshire, John F.K.
, p. 1163 - 1176 (2007/10/02)
When 2-(2' H-benzotriazol-2'-yl)phenols containing t-alkyl substituents are warmed in toluene solution with an aluminium chloride/nitromethane catalyst, the t-alkyl groups are transferred to the solvent (toluene).This transalkylation reaction has been used to prepare not readily accessible or previously inaccessible 2-(2' H-benzotriazol-2'-yl)phenols, a class of ultraviolet absorbers widely used in industry.
