3399-21-1Relevant articles and documents
Highly-efficient Ru/Al-SBA-15 catalysts with strong Lewis acid sites for the water-assisted hydrogenation of: P -phthalic acid
Ahamad, Tansir,Kankala, Ranjith Kumar,Mao, Cong,Matsagar, Babasaheb M.,Wu, Kevin C.-W.,Yang, Yucheng,Zhang, Xueqin,Zheng, Jingwei
, p. 2443 - 2451 (2020/05/14)
Ruthenium nanoparticles supported onto aluminum-doped mesoporous silica catalysts (Ru/Al-SBA-15) are fabricated using hydrothermal and impregnation methods for catalysis application. The Ru/Al-SBA-15-3 catalyst at a Si/Al molar ratio of 3 exhibited excellent catalytic performance for the hydrogenation of p-phthalic acid with high conversion efficiency (100.0%) and cis-isomer selectivity (84.0%) in water. Moreover, this system displays exceptional stability and recyclability through preserving the conversion efficiency, as well as a cis-isomer selectivity of 90.2 and 83.3%, respectively, after reusing it fourteen times. Such an exceptional system can also be ideal for the hydrogenation of aromatic dicarboxylic acids and their ester derivatives in water. Strong Lewis acid sites due to doped Al species play significant roles in the hydrogenation reaction. Moreover, isotope labeling studies indicated that water molecules effectively participated in the hydrogenation reaction. Hydrogen and water contributed half of the hydrogen atoms for this hydrogenation reaction. In the end, a plausible mechanistic pathway for the hydrogenation of p-phthalic acid using the Ru/Al-SBA-15-3 catalyst in water is proposed.
Ni-Catalyzed Site-Selective Dicarboxylation of 1,3-Dienes with CO2
Tortajada, Andreu,Ninokata, Ryo,Martin, Ruben
supporting information, p. 2050 - 2053 (2018/02/19)
A site-selective catalytic incorporation of multiple CO2 molecules into 1,3-dienes en route to adipic acids is described. This protocol is characterized by its mild conditions, excellent chemo- and regioselectivity and ease of execution under CO2 (1 atm), including the use of bulk butadiene and/or isoprene feedstocks.
Preparation method of trans-1,4-cyclohexane dicarboxylic acid monomethyl ester
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Paragraph 0029; 0034; 0037; 0039, (2018/07/06)
The invention discloses a preparation method of trans-1,4-cyclohexanedicarboxylic acid monomethyl ester. The preparation method comprises the following steps of using cis and trans mixed type dimethyl1,4-cyclohexanedicarboxylate with better solvent property in organic solvents as the raw material, performing isomerization reaction under the catalyzing action of an organic alkaline catalyst, and performing high-selectivity monoester hydrolyzing under the action of inorganic alkaline, so as to obtain the trans-1,4-cyclohexanedicarboxylic acid monomethyl ester. Compared with the prior art, the preparation method has the advantages that (1) the used raw material has good dissolvability in the organic solvent, such as methyl alcohol; (2) by adopting the optimized catalyst, the activating energy of the isomerization reaction is reduced, the isomerization time is shortened, the reaction energy consumption is decreased, the cost is reduced, and the optimized catalyst is suitable for industrialized production; (3) the hydrolyzing of diester is effectively reduced, the amount of diacid byproducts is reduced to be 2% or lower, and the product purity is improved; (4) a small amount of unreacted raw material is sent into an organic phase via an extracting procedure, and is separated from the product at high efficiency, so that the purity of the product is further improved.
Structure-activity relationship study of novel NR2B-selective antagonists with arylamides to avoid reactive metabolites formation
Kawai, Makoto,Sakurada, Isao,Morita, Asato,Iwamuro, Yuko,Ando, Kazuo,Omura, Hirofumi,Sakakibara, Sachiko,Masuda, Tsutomu,Koike, Hiroki,Honma, Teruki,Hattori, Kazunari,Takashima, Tadayuki,Mizuno, Kunihiko,Mizutani, Mayumi,Kawamura, Mitsuhiro
, p. 5537 - 5542 (2008/03/14)
A novel potent NMDA-NR2B selective antagonist (5b) without the reactive metabolites formation issue was identified. Through this study, a close correlation between reactive metabolites formation and calculated HOMO energies of parent compounds was found.
Separation of cis/trans-cyclohexanecarboxylates by enzymatic hydrolysis: Preference for diequatorial isomers
Koenigsberger, Kurt,Luna, Hector,Prasad, Kapa,Repic, Oljan,Blacklock, Thomas J.
, p. 9029 - 9032 (2007/10/03)
4-Substituted cis/trans-cyclohexanecarboxylates have been separated into the isomers by enzymatic hydrolysis with lipase from Candida rugosa with very good selectivity. The enzyme preferentially recognizes diequatorial conformations. Copyright (C) 1996 Elsevier Science Ltd.
Synthesis and Rearrangement of 1-Substituted Bicyclohexanes
Kirmse, Wolfgang,Sandkuehler, Peter
, p. 1394 - 1406 (2007/10/02)
Starting from 7-oxobicycloheptane-1-carbonyl chloride (3), bicyclohexane-1-carboxylic acid (9) was prepared via Hunsdiecker degradation and Favorskii rearrangement.The conversion of 9 to 1-methoxybicyclohexane (15) via methyl ketone 12 and acetate 13 was complicated by the facile homoketonization of the elusive bicyclohexane-1-ol (14).Similarly, bicyclohexane-1-amine readily underwent hydrolysis whereas N,N-dimethylbicyclohexane-1-amine (17) proved to be more resistant.Thermolysis of methyl bicyclohexane-1-carboxylate (10) revealed a "normal" rate enhancement (ΔEa ca. 6 kcal/mol = 25 kJ/mol).The effects of 1-acetoxy, 1-methoxy and 1-dimethylamino groups on the rate of rearrangement were unexpectedly small.