131-56-6Relevant articles and documents
Efficient microwave-assisted direct C-benzoylation of phenols and naphthols with benzoic acid catalyzed by bismuth triflate under solvent-free or ionic liquid conditions
Tran, Phuong Hoang,Phung, Huy Quang,Duong, Minh Nhat,Pham-Tran, Nguyen-Nguyen
, p. 1558 - 1563 (2017)
An efficient and simple route for the synthesis of ortho-hydroxyaryl ketones has been developed. The microwave-assisted direct C-benzoylation of phenols and naphthols in the presence of metal triflates afforded the corresponding ortho-hydroxyaryl ketones in moderate to excellent yields. Bismuth triflate showed the best catalytic performance compared to other metal triflates. The protocol has advantages including short reaction times, high chemoselectivity towards C-acylation, and simple work-up. Additionally, bismuth triflate can be easily recovered and reused several times without significant loss of catalytic performance.
Novel process for preparing sun-screening agent 2-hydroxy-4-n-octyloxy benzophenone
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Paragraph 0092-0096, (2021/02/06)
The invention discloses a novel process for preparing a sun-screening agent 2-hydroxy-4-n-octyloxy benzophenone. According to the process, 2,4-dihydroxy benzophenone is prepared, and 2,4-dihydroxy benzophenone and 1-chloro-n-octane are used as raw materials, wherein the prepared 2,4-dihydroxy benzophenone is simple in method, has no need of posttreatment and can be directly used as a reaction rawmaterial for subsequent reaction, and the energy consumption is reduced from the source; 1-chloro-n-octane is taken as an alkylation reagent, inorganic base is taken as a catalyst, solvents are addedfor reaction, and the yield of the obtained product 2-hydroxy-4-octyloxybenzophenone is high and can reach 90% or above. According to the method, the raw material cost is reduced, the problem of industrial wastewater at present is solved, in addition, the whole process is mild in condition, few in three wastes, high in yield and good in product quality, the use requirements of the cosmetic industry are met, the technological process is simple to operate and easy to realize, the intermediate reaction process is simple and easy to control, and industrial production can be realized.
Selective Oxidation of Alkylarenes to the Aromatic Ketones or Benzaldehydes with Water
Du, Jihong,Duan, Baogen,Liu, Kun,Liu, Renhua,Yu, Feifei,Yuan, Yongkun,Zhang, Chenyang,Zhang, Jin
supporting information, (2022/02/09)
Here a palladium-catalyzed oxidation method for converting alkylarenes into the aromatic ketones or benzaldehydes with water as the only oxygen donor is reported. This C-H bond oxidation functionalization does not require other oxidants and hydrogen accep
Clean production method of 2,4-dihydroxy benzophenone
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Paragraph 0035-0052, (2021/01/15)
The invention discloses a clean production method of 2,4-dihydroxy benzophenone, wherein the method comprises the steps: by using trichlorotoluene and resorcinol as initial raw materials, reacting ina water/ethanol system to generate 2,4-dihydroxy benzophenone, and concentrating, alkalizing, decolorizing and acidifying a mother solution to implement zero discharge of wastewater. According to themethod, cheap and easily available trichlorotoluene and resorcinol are used as starting materials, the production method is simple in process, green and environment-friendly, the product yield and purity are relatively high, and the method has a wide industrial application prospect.
A SUNSCREEN FORMULATION
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Paragraph 0045-0046; 0049-0050, (2020/06/10)
Disclosed herein are the synthesis of new classes of sunscreen agents, the usage of such sunscreen agents in sunscreen formulations aiming at reduction of sunscreen agents' skin penetration, and a formulation technology using existing sunscreen agents aiming at reduction of sunscreen agents's kin penetration, therefore improving the bio-safety of the sunscreen products.
Novel method for preparing intermediate of sun-screening agent, namely 2-hydroxy-4-methoxybenzophenone
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Paragraph 0064-0078, (2020/05/11)
The invention provides a synthesis method for 2,4-dihydroxy benzophenone. The method synthesizes the 2,4-dihydroxy benzophenone by using benzoic acid as an acylating agent in the presence of a catalyst. According to the invention, the benzoic acid with low cost is used as the acylation agent, so a large amount of acidic phenolic wastewater is prevented from being generated on the premise of keeping a high conversion rate, and the environmental burden and the post-treatment cost are greatly reduced. A solid acid catalyst adopted in the method is high in reaction selectivity, can absorb by-product water, is recyclable, has mild recycling treatment condition, and is practicable to operate; an obtained product is high in purity; the conversion rate of raw materials is high; a mother liquor hasfew impurities and can be directly recycled; and industrial production can be achieved easily.
Preparation method of ultraviolet absorbent UV-9
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Paragraph 0024-0027; 0031-0034; 0038-0041, (2019/02/26)
The invention provides a preparation method of an ultraviolet absorbent UV-9. The preparation method comprises following steps: step 1, water and methanol are added to a reaction kettle firstly, stirring is started, resorcinol is added, heating is performed, then benzotrichloride is dropwise added to the reaction kettle until the reaction is completed, mother liquor is subjected to centrifugal spin-drying, washing is performed until pH is neutral, and a UV-0 crude product is obtained; step 2, the UV-0 crude product, toluene and an acid-binding agent sodium carbonate are added to another reaction kettle, heating reflux is performed until no water drops appear, after cooling is performed, a catalyst PEG-400 is added, dimethyl sulfate is dropwise added, a mixture is heated after addition andsubjected to thermal insulation reaction until the components are reacted completely, water is added for washing, a product is left to stand for layering, organic phase is distilled under reduced pressure to remove an organic solvent methylbenzene, and a UV-9 crude product is obtained; step 3, the organic solvent is added to the UV-9 crude product for recrystallization, and a UV-9 finished productis obtained after centrifugation and drying. The problem of non-uniform color of the UV-9 product is solved, the product yield is increased, and the product cost is reduced.
Methylene quinone compound and preparation method thereof, and polymerization inhibitor and application thereof
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Paragraph 0083-0087; 0095; 0096; 0104; 0105; 0113; 0114, (2019/11/21)
The invention relates to a methylene quinone compound and a preparation method thereof, and a polymerization inhibitor and application thereof. The methylene quinone compound has a structure as described in the specification; and in the structure, R is an alkyl group with a carbon number of 8 to 22, and t-Bu is a tert-butyl group. The above methylene quinone compound plays a polymerization inhibition role by the double mechanisms of quinone polymerization inhibition and ultraviolet absorption, and has excellent polymerization inhibition effect.
Method for synthesizing ultraviolet ray absorber UV-0 through solid acid catalysis
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Paragraph 0021; 0022; 0024, (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%.
A 2, 4 - dihydroxy benzophenone green synthesis process (by machine translation)
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Paragraph 0011; 0026-0032, (2018/04/26)
The invention belongs to the field of fine chemicals, discloses a 2, 4 - dihydroxy benzophenone ultraviolet absorbent synthesize new process. The steps are as follows: in a reaction container into the resorcinol of ethanol saturated solution with a certain amount of catalyst BiCl3 Or mixed with 5% (w/w) CeO2 Composite HZSM - 5 zeolite catalyst, in the good stirring under heating is dropped saturated ethanol solution of benzoic anhydride, for 60 - 80 °C reflow reaction after a certain time, stop heating, separating solid material. According to the selected catalyst different follow-up processing, separating the catalyst with the crude product, the crude product of ethanol and mixing the fluid is heavy water of crystallization to obtain the finished product 2, 4 - dihydroxy benzophenone. The invention uses low toxicity flavor raw materials and reagent, using novel catalyst has the advantages of easy separation, easy recycling, the whole reaction of simple process, small pollution to the environment, the synthesis of the 2, 4 - dihydroxy benzophenone purity of 99% or more, can achieve the yield 94% or more. Suitable for use as polyvinyl chloride, polystyrene, epoxy resin, cellulose resin, unsaturated resin, coating, and the synthetic rubber of the light stabilizer. (by machine translation)
