136-36-7Relevant articles and documents
Zaugg
, p. 3419 (1976)
Method for synthesizing ultraviolet ray absorber UV-0 through solid acid catalysis
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Paragraph 0021; 0023, (2018/11/10)
The invention provides a method for synthesizing an ultraviolet ray absorber UV-0 through solid acid catalysis. The method comprises the following steps that benzoic acid, resorcinol and phosphotungstic acid are added into a container, heating is conducted in an oil bath to 110-140 DEG C, stirring is conducted for a reaction for 5-24 hours, it is monitored that the reaction is completed through thin layer chromatography, after cooling, toluene is added for dissolving the product, and solid catalyst phosphotungstic acid is subjected to suction filtration and recycled; a residue obtained throughevaporation of a filtrate is recrystallized with methanol/water to obtain pale yellow solid, namely the ultraviolet ray absorber UV-0. By means of the process, the yield of the UV-0 is greater than 96%.
Synthesis of industrially important aromatic and heterocyclic ketones using hierarchical ZSM-5 and Beta zeolites
Kore, Rajkumar,Srivastava, Rajendra,Satpati, Biswarup
, p. 129 - 141 (2015/09/28)
Hierarchical ZSM-5 and Beta zeolites were investigated in the synthesis of wide range of industrially important aromatic/heterocyclic ketones by Friedel-Crafts acylation and benzoylation reactions. For comparative study, conventional ZSM-5 and Beta, and amorphous mesoporous Al-MCM-41 were investigated. Hierarchical zeolites were prepared by multi-ammonium structure directing agents whereas conventional zeolites were prepared by mono-ammonium structure directing agents. Among the catalysts investigated in this study, hierarchical Beta exhibited the highest reactant conversion in the acylation and benzoylation reactions. In this study, the systematic assessment of the catalytic activity of acid catalysts for wide range of aromatic and heterocyclic compounds is shown under one umbrella. To the best of our knowledge, these reactions over hierarchical zeolites (ZSM-5 and Beta) are reported here for the first time. Structure activity relationship is explained based on the physico-chemical properties, molecular size, reactivity of reactants, and reaction mechanism. Catalysts can be easily recovered and reused with negligible loss in the catalytic activity.
