- Preparation method 3 - [3 - (benzotriazol -2 - yl) -4 - hydroxyl -5 -tert-butylphenyl] - propionate
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The invention belongs to the technical field of organic synthesis and particularly relates to a preparation method of 3 - [3 - (benzotriazole -2 - yl) -4 - hydroxyl -5 -tert-butylphenyl] - propionate, taking 3 - [3 - (benzotriazol -2 - yl) -4 - hydroxy -5 -tert-butylphenyl] - propionic acid and methanol as raw materials. The product 3 - [3 - (benzotriazol -2 -yl) -4 - hydroxyl -5 -tert-butylphenyl] - propionate is prepared under the action of silica supported titanium sulfate, silica supported zirconium sulfate or a solid acid catalyst loaded with cerium sulfate with a high cerium sulfate. The invention relates to a method for synthesizing 3 - [3 - (benzotriazol -2 - yl) -4 - hydroxyl -5 -tert-butylphenyl] - propionate with simple operation and high selectivity.
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Paragraph 0018-0030
(2021/09/29)
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- Preparation method of 3-[3-(-benzotriazole -2-base)-4-hydroxy -5-tert-butylphenyl]- propionate (by machine translation)
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3 - (3,5 - Of the process reduces, the tedious degree) of the process, omits the crystallization separation process, in the preparation process of the target product, saves the raw material ", and reduces the output " of waste, water and inorganic salt and other wastes 3 - [3 - (.) - 4 - The method, of the, present invention reduces the complexity, of the process by the. method] - of separating, and purifying the intermediate product, without isolation. (by machine translation)
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- Composition comprising pesticide and benzotriazole UV absorbers
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The present invention relates to an agrochemical composition comprising pesticide and UV absorber. The invention furthermore relates to UV-absorbers and to the use thereof in agrochemical compositions. It moreover relates to a method of controlling phytopathogenic fungi and/or undesirable plant growth and/or undesirable insect or mite infestation and/or of regulating plant growth.
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Page/Page column 6-7
(2012/03/26)
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- Process for the preparation of benzotriazoles
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A process for the preparation of compounds of formula (I): wherein the general symbols are as defined in claim 1, which comprises reacting a compound of formula (V): wherein R1, R2, R3, R4, R5, R6, R7, R8, R9 and R18 are as defined in claim 1, and R18 is especially nitro, chlorine or bromine, with an azide compound of formula (IX): wherein M and n are as defined in claim 1, especially with sodium azide.
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- Processes for the preparation of benzotriazole UV absorbers
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Provided is a process for preparing 2H-benzotriazole UV absorbers containing a perfluoroalkyl moiety at the 5-position of the benzo ring, for example a trifluoromethyl group, which involves diazotizing the perfluoroalkyl substituted o-nitroaniline using concentrated sulfuric acid plus sodium nitrite or nitrosylsulfuric acid to form the corresponding monoazobenzene intermediate via the diazonium salt intermediate which is reduced to the corresponding 5-perfluoroalkyl substituted 2H-benzotriazole UV absorber compound by conventional reduction means. Also provided is a novel one-pot, multiphase reaction for the preparation of 2(2-nitrophenylazo) substituted phenols, which are precursors for 2H-benzotriazole UV absorbers.
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