765-87-7Relevant articles and documents
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Ripan et al.
, p. 140,143, 145 (1968)
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Preparation method 1 and 2 - cyclohexanedione
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Paragraph 0048; 0052; 0055; 0059; 0064; 0065; 0069; 0079, (2021/11/10)
The invention belongs to the technical field of chemical synthesis and particularly relates to a preparation method of 1-2 - cyclohexanedione. The invention provides 1-2 - Cyclohexanedione preparation method which comprises the following steps: cyclohexanone. The bromo reagent, the basic catalyst and the polar organic solvent are mixed for bromination reaction to obtain 2, 6 - dibromocyclohexanone. The mixture of 2, 6 - dibromocyclohexanone, inorganic base and polar solvent is subjected to hydrolysis reaction to obtain the 1, 2 -cyclohexanedione. To the preparation method, cyclohexanone and bromination reagent are taken as raw materials, 1 and 2 - cyclohexanedione with high yield and high purity can be prepared by sequentially conducting bromination reaction and hydrolysis reaction, and the preparation method provided by the invention is simple and easy to obtain and suitable for industrial production.
Ultrafast synthesis of nanosized Ti-Beta as an efficient oxidation catalyst: Via a structural reconstruction method
Wang, Bowen,Xu, Hao,Zhu, Zhiguo,Guan, Yejun,Wu, Peng
, p. 1857 - 1866 (2019/04/29)
As a representative selective oxidation titanosilicate catalyst, a Ti-Beta zeolite is less used in comparison with TS-1, Ti-MWW and Ti-MOR, mostly due to its high hydrophilicity originating from a BEA? intergrowth framework. A novel recrystallization method was proposed in the present study to prepare highly hydrophobic Ti-Beta with nanosized crystals (90 nm), high Ti content (Si/Ti = 20) and intercrystal mesoporosity. The fluoride-assisted recrystallization was realized quickly by dissolving extensively a dealuminated Beta zeolite in a mixture of a tetraethylammonium aqueous solution and Ti precursor, producing highly crystalline Ti-Beta in an extremely short time of 1 h. The obtained Ti-Beta zeolite exhibited superior catalytic activity in the liquid-phase epoxidation reactions of bulky alkenes like cyclohexene with hydrogen peroxide or tert-butyl hydroperoxide as an oxidant, compared to those Ti-Beta catalysts prepared by conventional hydrothermal or secondary synthesis routes.