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Aggregation-Induced Catalysis: Asymmetric Catalysis with Chiral Aggregates

Research 2024年第1期2023卷 525-532页

作者： Yao Tang Yu Wang Qingkai Yuan Sai Zhang Jia-Yin Wang Shengzhou Jin Ting Xu Junyi Pan kazimierz surowiec Guigen Li Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTX 79409-1061USA School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China School of Pharmacy Continuous Flow Engineering Laboratory of National Petroleum and Chemical IndustryChangzhou UniversityChangzhouJiangsu 213164China

So far,there have been 4 methods to control chirality including the use of chiral auxiliaries,reagents,solvents,and catalysts documented in literature and *** them,asymmetric catalysts are normally divided into homogeneous and heterogeneous *** this report,we present a new type of asymmetric control—asymmetric catalysis via chiral aggregates that would not belong to the above *** new strategy is represented by catalytic asymmetric dihydroxylation reaction of olefins in which chiral ligands are aggregated by taking advantage of typical aggregation-induced emission systems containing tetrahydrofuran and H_(2)O *** was proven that the chiral induction can be enhanced from er of 78:22 to 97:3 simply by changing the ratios of these 2 cosolvents.

关键词： chiral asymmetric Chiral

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Multilayer 3D Chiral Folding Polymers and Their Asymmetric Catalytic Assembly

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Research 2022年第2期2022卷 307-314页

作者： Yao Tang Shengzhou Jin Sai Zhang Guan-Zhao Wu Jia-Yin Wang Ting Xu Yu Wang Daniel Unruh kazimierz surowiec Yanzhang Ma Shiren Wang Courtney Katz Hongjun Liang Yunze Li Wellong Cong Guigen Li Department of Chemistry and Bochemistry Texas Tech UiniversityLubockTexas 79409-1061USA Institute of Chemistry and Biomedical Sciences School of Chermistry and Chemical EngineeringNanjing UnivrsityNanjing 210093China Department of Mechanical Engineering Texas Tech UniversilyLubockTexas 79409-1061USA Deparment of Indusrtrial。Systems Enginering Texas ACM UniversiyCollege StationTexas 77843USA Deparment of Cell Plhysiology and Molecular Biophysics School of MedicineTexas Tech University Heath Sciemces CenterLubbockTX 79430-6551.USA Department of Indiustrial Engineering Texas Tech UniversityLubookTexas 79409.3061USA

A novel class of polymers and oligomers of chiral folding chirality has been designed and synthesized,showing structurally compacted ***/multiple layer *** uniformed and diferentiated aromatic chromophoric units were successfully constructed between naphthy!piers of this *** monomers,catalysts,and catalytic systems led 1o the success of asymmetric catalytic Suzuki-Miyaura polycouplings Enantio-and diastereochemistry were unambiguously determined by X-ray structural analysis and concurrently by comparison with a similar asymmetric induction by the same catalyst in the asymmetric synthesis of a chiral three layered *** resuling chiral polymers exhibit intense fluorescence activity in a solid form and solution under speci fic wavelength irradiation.

关键词： chiral asymmetric Catalytic

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Multilayer 3D Chirality and Its Synthetic Assembly

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Research 2019年第1期2019卷 822-832页

作者： Guanzhao Wu Yangxue Liu Zhen Yang Nandakumar Katakam Hossein Rouh Sultan Ahmed Daniel Unruh kazimierz surowiec Guigen Li Institute of Chemistry and BioMedical Sciences School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210093China Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTX 79409-1061USA

3D chirality of sandwich type of organic molecules has been *** key element of this chirality is characterized by three layers of structures that are arranged nearly in parallel fashion with one on top and one down from the center *** enantiomers of these molecules have been fully characterized by spectroscopies with their enantiomeric purity measured by chiral *** absolute confguration was unambiguously assigned by X-ray difraction *** is the frst multilayer 3D chirality reported and is anticipated to lead to a new research area of asymmetric synthesis and catalysis and to have a broad impact on chemical,medicinal,and material sciences in future.

关键词： purity absolute sandwich

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Energy expenditure and muscular activation patterns through active sitting on compliant surfaces

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Journal of Sport and Health Science 2017年第2期6卷 207-212页

作者： D.Clark Dickin Rachel K.surowiec Henry Wang Biomechanics Laboratory Ball State UniversityMuncieIN 47306USA

Purpose: To test the effectiveness of sitting surfaces with varied amounts of stability on muscle activity and energy ***: Using a within-participants repeated measures design, 11 healthy young-adult females(age = 20.0 ± 1.8 years) were measured using indirect calorimetry to assess energy expenditure, and electromyography to assess muscular activation in trunk and leg musculature under 3different sitting surfaces: flat-firm surface, air-filled cushion, and a stability ball. Data were analyzed using repeated measures analysis of variance with follow-up pairwise contrasts used to determine the specific effects of sitting surface on muscle activation and energy ***: Significantly greater energy expenditure was recorded for the stability ball(p = 0.01) and the cushion(p = 0.03) over the flat surface(10.4% and 9.6% greater, respectively), with no differences between the ball and the cushion. Both the ball and the cushion produced higher tibialis anterior activation over the flat surface(1.09 and 0.63 root-mean-square millivolts(RMSmv), respectively), while the stability ball produced higher soleus activity over both cushion and flat surfaces(3.97 and 4.24 RMSmv, respectively). Additionally, the cushion elicited higher adductor longus activity over the ball and flat surfaces(1.76 and 1.81 RMSmv, respectively), but no trunk musculature differences were ***: Compliant surfaces resulted in higher levels of muscular activation in the lower extremities facilitating increased caloric *** the increasing trends in sedentary careers and the increases in obesity, this is an important finding to validate the merits of active sitting facilitating increased caloric expenditure and muscle activation.

关键词：肌肉活动能量消耗表面激活柔顺热量消耗稳定性测量设计

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