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Recent advances on iron-catalyzed coupling reactions involving organolithium reagents

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chinese chemical Letters 2019年第8期30卷 1463-1467页

作者： Zhuliang Zhong Xiao-Shui Peng henry n.c.wong Department of chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong Kong

Owing to their inexpensive and environmentally friendly properties,iron-based catalysts have been actively investigated for new organic *** this account,we summarized our recent results on iron-catalyzed cross-coupling reactions and homo-coupling *** iron-based catalysts,we constructed diverse carbon-carbon bonds,i.e.,c(sp^2)-c(sp^3),c(sp^3)-c(sp^3),c(sp^3)-c(sp^2)and c(sp^2)-c(sp^2)*** order to demonstrate the usefulness of our iron protocol,we also carried out these reactions on gram-scale reactions,leading to good yields.

关键词： Iron-catalyzed cross-coupling Homo-coupling Organolithium Gram-scale

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Synthesis of tetraphenylene derivatives and their recent advances

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national Science Review 2017年第6期4卷 892-916页

作者： Jian-Wei Han Xiao-Shui Peng henry n.c.wong Shanghai-Hong Kong Joint Laboratory in chemical Synthesis Shanghai Institute of Organic ChemistryChinese Academy of Sciences Key Laboratory for Advanced Materials Institute of Fine Chemicals School of Chemistry & Molecular Engineering East China University of Science and Technology Department of chemistry Center of Novel Functional Molecules Institute of Molecular Functional Materials and State Key Laboratory of Synthetic ChemistryThe Chinese University of Hong Kong

The synthetic strategies towards tetraphenylene derivatives are comprehensively summarized in this *** advances in the functionalized tetraphenylene skeleton for research into their structurally unique properties are ... 详细信息

关键词： tetraphenylene aromatic chiral carbocycles eight-membered rings

cRYSTAL STRUcTURES OF 1,2-BEnZO[2.2]PARAcYcLOPHAnE AnD 1,2-BEnZO[2.2]PARAcYcLOPHAnE-1,7-DIEnE

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结构化学 1985年第3期 214-217页

作者：黄乃正陈展榮麥松威 Department of chemistry The chinese University of Hong Kong Shatin new Territories Hong Kong

c20H16 (1) Mr = 256.34 and c20H14 (2), Mr = 254.32 are isomorphous, orthorhombic, P212121, Z = 4. For (?), ?a= 7.116(1), b =7.874(2), c = 24.564(4) A, V = 1376.4(3) A3, Dx = 1.237 g cm-3, μ(Mo-K α) =0.65 cm-1 , final R = 0.047 for 1152 observed reflections; for 2, a=6.963(2), b = 7.985(4), c = 24.315(8) A, V = 1351.9(8) A3, Dx = 1.250 g cm-3,μ(Mo-Kα) = 0.66 cm-1 , final R = 0.076 for 886 observed data. Structuralfeatures are similar to those of the parent [2.2]paracyclophane and related derivatives.

关键词： parent orthorhombic fused substitution benzene morethan bonds diene adequately allowed

convergence Analysis of Iterative Sequences for a Pair of Mappings in Banach Spaces

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Acta Mathematica Sinica,English Series 2008年第3期24卷 463-470页

作者： Liu chuan ZEnG n.c.wong J.c.YAO Department of Mathematics Shanghai Normal University Shanghai 200234 P. R. China Department of Applied Mathematics National Sun Yat-Sen University Kaohsiung Taiwan 80424

Let c be a nonempty closed convex subset of a real Banach space E. Let S ： c→ c be a quasi-nonexpansive mapping, let T ： c→c be an asymptotically demicontractive and uniformly Lipschitzian mapping, and let F ：= {x ∈c ： Sx = x and Tx = x}≠Ф Let {xn}n≥0 be the sequence generated irom an arbitrary x0∈cby xn＋i=（1-cn）Sxn＋cnT^nxn, n≥*** prove the necessary and sufficient conditions for the strong convergence of the iterative sequence {xn} to an element of F. These extend and improve the recent results of Moore and nnoli.

关键词： quasi-nonexpansive mapping asymptotically demicontractive type mapping iterative sequence convergence analysis

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Use of Silicon Substituents in the Syntheses of natural and non-natural Molecules

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chinese Journal of chemistry 2005年第8期23卷 1106-1108页

作者： wong, henry n. c. Department of chemistry Institute of Chinese Medicine and Central Laboratory of Institute of Molecular Technology for Drug Discovery and Synthesis The Chinese University of Hong Kong Shatin New TerritoriesHong Kong SAR China

Trimethylsilyl groups have been used in our research as a director as well as a bulky and lipophilic group in our quest for natural and non-natural molecules.

关键词： trimethylsilyl bulky group lipophilic group

Spectral control of nonclassical light pulses using an integrated thin-film lithium niobate modulator

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Light(Science & Applications) 2022年第12期11卷 2922-2930页

作者： Di Zhu changchen chen Mengjie Yu Linbo Shao Yaowen Hu cJXin Matthew Yeh Soumya Ghosh Lingyan He christian Reimer neil Sinclair Franco n.c.wong Mian Zhang Marko Loncar John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA HyperLight corporation 1 Bow StreetSuite 420CambridgeMA 02139USA Division of Physics Mathematics and Astronomyand Alliance for Quantum Technologies(AQT)California Institute of TechnologyPasadenaCA 91125USA

Manipulating the frequency and bandwidth of nonclassical light is essential for implementing frequency-encoded/multiplexed quantum computation,communication,and networking protocols,and for bridging spectral mismatch among various quantum ***,quantum spectral control requires a strong nonlinearity mediated by light,microwave,or acoustics,which is challenging to realize with high efficiency,low noise,and on an integrated ***,we demonstrate both frequency shifting and bandwidth compression of heralded single-photon pulses using an integrated thin-film lithium niobate(TFLn)phase *** achieve record-high electro-optic frequency shearing of telecom single photons over terahertz range(±641 GHz or±5.2 nm),enabling high visibility quantum interference between frequency-nondegenerate photon *** further operate the modulator as a time lens and demonstrate over eighteen-fold(6.55 nm to 0.35 nm)bandwidth compression of single *** results showcase the viability and promise of on-chip quantum spectral control for scalable photonic quantum information processing.

关键词： quantum lithium film

Dopaminergic effects on in vitro osteogenesis

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Bone Research 2015年第3期3卷 130-139页

作者： Dong Joon Lee henry c Tseng Sing Wai wong Zhengyan Wang Meng Deng ching-chang Ko nc Oral Health Institute School of Dentistry University of North Carolina Duke Eye center and Department of Ophthalmology Duke University Medical center Oral Biology Program School of Dentistry University of North Carolina Department of Pediatric Dentistry School of Dentistry University of North Carolina Department of Orthodontics School of Dentistry University of North Carolina

Multiple growth factors（e.g., BMP2, TGF-b1, FGF2） and isolated genes have been shown to improve osteoblastic proliferation and mineralization, advancing bone tissue engineering. Among these factors, both polydopamine（PDA） and dopamine（DA） monomer have recently been reported to increase osteoblast proliferation and mineralization in vitro. Although a well-characterized neurotransmitter, DA＇s role in the bone is unknown. We hypothesize that DA can directly act on osteoblasts, and examined whether osteoblasts express DA receptors that respond to exogenous DA. m RnAs and protein cell lysates were obtained from Mc3T3-E1 cells during osteogenic differentiation phase. Reverse transcription polymerase chain reaction and western blot analysis were used to examine the expression of DA receptors, D1–D5. Dose-response effect and time course of DA treatment on cell proliferation, mineralization, and osteogenic differentiation were investigated at pre-determined days. Real-time PcR was performed to investigate whether DA affects osteogenic gene expression（ALP, BSP, Oc, OSX, RUnX2, and collagen1a2） with or without receptor antagonists（ScH233390 and GR103691）. Two-way AnOVA was used for statistical analysis. All five DA receptors（D1, D2, D3, D4, and D5） m RnAs and proteins were expressed in Mc3T3-E1 cells. DA treatment increased cell proliferation for up to 7 days（P, 0.05）. Osteogenic mineralization was significantly greater in the DA-treated group than control group（P, 0.05）. Finally, expression of all the osteogenic genes was inhibited by DA receptor antagonists for D1, D3, and D5. Our findings suggest that Mc3T3-E1 osteoblasts express functional DA receptors that enhance proliferation and mineralization. PDA is not biologically inert and has important implications in orthopedic applications. Furthermore, osteoblast differentiation might be regulated by the nervous system, presumably during bone development, remodeling, or repair.

关键词： osteogenic differentiation cell proliferation polymerase chain reaction bone tissue engineering western blot analysis statistical analysis bone development gene expression nervous system growth factors in vitro

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convergence of Hybrid Steepest-Descent Methods for Generalized Variational Inequalities

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Acta Mathematica Sinica,English Series 2006年第1期22卷 1-12页

作者： Liu chuan ZEnG n. c. wong J. c. YAO Department of Mathematics Shanghai Normal University Shanghai 200234 P. R. China Department of Applied Mathematics National Sun Yat-sen University Kaohsiung Taiwan 804

In this paper, we consider the generalized variational inequality GVI（F, g, c）, where F and g are mappings from a Hilbert space into itself and c is the fixed point set of a nonexpansive mapping. We propose two iterative algorithms to find approximate solutions of the GVI（F,g, c）. Strong convergence results are established and applications to constrained generalized pseudo-inverse are included.

关键词： iterative algorithms hybrid steepest-descent methods nonexpansive mappings Hilbert space constrained generalized pseudo-inverse

The Weakly Potency of certain Hnn Extensions of nilpotent Groups

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Algebra colloquium 2014年第4期21卷 689-696页

作者： K.B. wong P.c. wong Institute of Mathematical Sciences University of Malaya 50603 Kuala Lumpur Malaysia

In this paper we give a characterization for certain Hnn extensions oi suogroup separable groups with normal associated subgroups to be weakly potent. We then apply our result to show that certain Hnn extensions of fi... 详细信息

关键词： weakly potent Hnn extensions subgroup separable finitely generated nilpo-tent groups