Lianhui Chen

Wenzhou University

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Min Shi

Shanghai Institute of Organic Chemistry

Zuntu Xu

Axcelis Technologies (United States)

Xiaoyu Ma

Chinese Academy of Sciences

Shen Guang-di

Beijing University of Technology

Shutang Wang

First Affiliated Hospital of Guangzhou University of Chinese Medicine

Guowen Yang

Xi'an Institute of Optics and Precision Mechanics

Liang Guo

Shandong First Medical University

Changhua Chen

Northwest Institute of Nuclear Technology

Xing‐Guo Zhang

Wenzhou University

Qing Cao

Hebei Normal University

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Chinese Academy of Sciences

Institute of Semiconductors

University of Chinese Academy of Sciences

Wenzhou University

Zhejiang University

Beijing University of Technology

Nanjing University

Shanghai Jiao Tong University

State Key Laboratory on Integrated Optoelectronics

Sichuan University

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Asymmetric Aza‐Morita–BaylisHillman Reaction of N‐Sulfonated Imines with Activated Olefins Catalyzed by Chiral Phosphine Lewis Bases Bearing Multiple Phenol Groups

Advanced Synthesis & Catalysis (2006)

Ying‐Hao Liu Lianhui Chen Min Shi

Abstract In the aza‐Morita–BaylisHillman reaction of N ‐sulfonated imines ( N ‐arylmethylidene‐4‐methylbenzenesulfonamides) with methyl vinyl ketone (MVK), ethyl vinyl ketone (EVK), and acrolein, we found that, through the use of catalytic amounts of chiral phosphine Lewis bases bearing multiple phenol groups, the corresponding adducts could be obtained in good yields with >90% ee at −20 °C or at room temperature in THF. The mechanism of this process was investigated by 31 P NMR spectroscopic analysis. The phenoxide or the key enolate intermediate, which is stabilized by intramolecular hydrogen bonding with phenol groups, was observed by 31 P NMR spectroscopy. Thus, the most effective bifunctional LBBA (Lewis base and Brønsted acid) phosphine‐Lewis base promoter system reported to date has been identified for such catalytic, asymmetric aza‐Morita–BaylisHillman reactions.

Methyl vinyl ketone

Baylis–Hillman reaction

Brønsted–Lowry acid–base theory

10.1002/adsc.200505476

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Citations (101)

ChemInform Abstract: Synthesis of 3‐Trifluoromethylbenzofurans via Palladium‐Catalyzed Tandem Elimination/Annulation of β‐Chloro‐β‐(trifluoromethyl)styrenes with 2‐Halophenols.

ChemInform (2014)

Chong Wang Lianhui Chen Chen‐Liang Deng Xing‐Guo Zhang

Alma mater

Zhàng

Annulation

10.1002/chin.201429127

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Chiral phosphine Lewis bases in catalytic, asymmetric aza-Morita-Baylis-Hillman reaction

Pure and Applied Chemistry (2005)

Min Shi Lianhui Chen

Abstract In the aza-Morita-Baylis-Hillman reaction of N -sulfonated imines with methyl vinyl ketone (MVK) promoted by chiral phosphine Lewis base: ( R )-2'-diphenylphosphanyl-[1,1']binaphthalenyl-2-ol ( LB1 ) (10 mol %), the aza-Morita-Baylis-Hillman adducts were obtained in good yields with high ee (70-94 % ee) at -30 °C in THF. The scope and limitations of this reaction have been disclosed.

Methyl vinyl ketone

Baylis–Hillman reaction

10.1351/pac200577122105

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Citations (19)

[Clinical significance of non-high-density lipoprotein cholesterol and its application in pediatrics].

PubMed (2013)

Lianhui Chen Xifeng Shi Liang Li

Source

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High-performance 155-μm InGaAsP/InP strained layer quantum well laser diodes fabricated by MOCVD overgrowth method

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1998)

Xiaoyu Ma Qing Cao Shutang Wang Liang Guo Zhongming Wang

High performance uncooled 1.55 micrometers InGaAsP/InP strained layer quantum well lasers grown by low pressure metal organic chemical vapor deposition (LP-MOCVD) were reported in this paper. Whole MOCVD over growth method were applied in this work. The threshold currents of 5 mA and the highest lasing temperature of 122 degree(s)C were obtained.

10.1117/12.319615

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Asymmetric catalysis of Morita‐Baylis‐Hillman reactions by chiral phosphine Lewis bases bearing multiple phenol groups

Chirality (2006)

Min Shi Ying‐Hao Liu Lianhui Chen

In the Morita-Baylis-Hillman (MBH) reactions of arylaldehydes with methyl vinyl ketone, it was observed that in the presence of a catalytic amount of a chiral phosphine Lewis base (CPLB) bearing multiple phenol groups, such as CPLB1 (10 mol %), the corresponding MBH adducts could be obtained in moderate to good yields with low to moderate ee's (4-45% ee) at ambient temperature (10 degrees C) in THF.

Methyl vinyl ketone

Chirality

Baylis–Hillman reaction

10.1002/chir.20313

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Citations (25)

High-efficiency low-vertical-divergence-angle 980-nm Al-free active region lasers with novel large optical cavity and asymmetrical cladding layers

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2000)

Zuntu Xu Jingming Zhang Xiaoyu Ma Guowen Yang Shen Guang-di

980 nm InGaAs/InGaAsP/AlGaAs strained quantum well lasers with novel large optical cavity and asymmetrical claddings was fabricated by MOCVD. Very high differential quantum efficiency of 90% (1.15 W/A) and low vertical divergence angle of 24 degree(s) at long cavity length were obtained for 100 micrometers stripe lasers. The differential quantum efficiency is up to 94% (1.20) at cavity length of 500 micrometers .

Cladding (metalworking)

Quantum Efficiency

10.1117/12.382108

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Carbon-doped 980-nm InGaAs strained quantum well lasers grown by metalorganic chemical vapor deposition

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1998)

Tao Yin Peng Lian Zuntu Xu Changhua Chen Hongdong Zhao

Graded-index separate-confinement strained quantum well InGaAs/GaAs/GaAlAs lasers grown by metalorganic chemical- vapor deposition with carbon tetrachloride used as p-doped source for upper cladding layer and the capping layer are studied. By SIMS and electrochemical capacitance-voltage measurements, the desirable quantum well structure and the suitable doping and carrier concentrations profiles are found to be obtained. The grown crystals show good optical characteristics through the photoluminescence spectrum measurement of the upper cladding layer and the active layer. The oxide-stripe and the ridge waveguide stripe lasers are fabricated, the lower threshold current densities 160 A/cm² (uncoated) with 1500 micrometers long cavity are obtained. The differential quantum efficiency and the output power can be up to 0.4 W/A and 500 mw (uncoated).

Cladding (metalworking)

Quantum Efficiency

10.1117/12.319646

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Citations (1)

Serum bisphenol A concentration and premature thelarche in female infants aged 4-month to 2-year old

International Journal of Pediatric Endocrinology (2015)

Lianhui Chen Jianrong Shi Yanlan Fang Li Liang Wan-qin Chen

AimsTo estimate the association between serum bisphenol A and premature thelarche in female infants aged 4-month to 2-year old. MethodsWe set a case-control study, a total of 251 female infants (aged 4 months to 2 years) with premature thelarche and 33 healthy age-matched control subjects were enrolled.Test the serum bisphenol A (serum BPA) concentration by liquid-liquid extraction coupled with ultra-performance liquid chromatography tandem mass spectrometry.

10.1186/1687-9856-2015-s1-o45

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<title>High-brightness AlGaInP orange light-emitting diodes</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1998)

Yuzhang Li Guohong Wang Xiaoyu Ma Huaide Peng Shutang Wang

Orange AlGaInP high brightness light emitting diodes (LEDs) were fabricated by low pressure metalorganic chemical vapor deposition technology. AlGaInP double heterojunction structure was used as active layer. 15 pairs of Al_0.5Ga_0.5As/AlAs distributed Bragg reflector and 7 micrometers Al_0.8Ga_0.2As current spreading layer were employed to reduce the absorption of GaAs substrate and upper anode respectively. At 20 mA the LEDs emitting wavelength was between 600 - 610 nm with 18.3 nm FWHM, 0.45 mW radiation power and 1.7% external quantum efficiency. Brightness of the LED chips and LED lamps with 15 degree(s) viewing angle (2(theta) _1/2) reached 30 mcd and 1000 mcd respectively.

Double heterostructure

Quantum Efficiency

10.1117/12.319695

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