A5029593371- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Catalytic C–H Functionalization Methods
- Cyclopropane Reaction Mechanisms
- Asymmetric Synthesis and Catalysis
- Atmospheric Ozone and Climate
- Asymmetric Hydrogenation and Catalysis
- Climate variability and models
- Synthetic Organic Chemistry Methods
- Antenna Design and Analysis
- Catalytic Cross-Coupling Reactions
- Synthesis and Catalytic Reactions
- Atmospheric and Environmental Gas Dynamics
- Advanced Antenna and Metasurface Technologies
- Catalytic Alkyne Reactions
- Inorganic Fluorides and Related Compounds
- Advanced Synthetic Organic Chemistry
- Crystallography and molecular interactions
- Oceanographic and Atmospheric Processes
- Surface Chemistry and Catalysis
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Geophysics and Gravity Measurements
- Metamaterials and Metasurfaces Applications
- Oxidative Organic Chemistry Reactions
- Chemical Synthesis and Analysis
Chengdu University of Information Technology
2021-2024
Nanjing University of Science and Technology
2023
Shanghai Institute of Organic Chemistry
2017-2022
Chinese Academy of Sciences
2017-2022
University of Chinese Academy of Sciences
2018-2019
The activated alkynes have been used successfully for the first time as dipolarophile in palladium-catalyzed asymmetric (3 + 2) cycloaddition, affording highly functionalized cyclopentenes good to high yields with chemoselectivities and enantioselectivities. introduction of an additional carbonyl group at α-position alkynyl esters is key activating carbon-carbon triple bond. reaction process was investigated, inverse Pd-catalyzed cycloaddition observed.
1,1,2-Trisubstituted alkenes with a single activator were used in the Pd-catalyzed asymmetric cycloaddition of vinyl epoxides high diastereo- and enantioselectivities.
The Pd-catalyzed asymmetric [4+2] cycloaddition reaction of an aliphatic 1,4-dipole with singly activated electron-deficient alkenes is realized for the first time, enabled by using a newly developed benzylic substituted P,N-ligand, affording tetrahydropyrans having three continuous chiral centers in high yields diastereo- and enantioselectivities. rational transition states as well role center are proposed.
Abstract The enantioselective construction of C–CF 2 R (R: alkyl or fluoroalkyl) bonds has attracted the attention synthetic chemists because importance chiral fluorinated compounds in life and materials sciences. Catalytic asymmetric fluoroalkylation mainly been realized under organocatalysis Lewis acid catalysis, with substrates limited to carbonyl compounds. Few examples using transition-metal catalysis exist, owing side reactions including decomposition isomerization fluoroalkylating...
(E)-gem-Alkyl,aryl-disubstituted allyl carbonates can react with ketones under Pd catalysis using a commercially available NHC ligand by suppressing the β-H elimination. Ketones α-tertiary, β-quaternary carbon stereocenters were produced in high yields regio- and diastereoselectivities. Kinetic resolution of reaction product via CBS reduction afforded optically active ketone as well alcohol enantioselectivity (S-factor = 35). The utility methodology was also demonstrated transformations products.
Diastereo- and enantioselective construction of vicinal tertiary quaternary carbon centers is a great challenge in synthetic chemistry. Herein, we report facile efficient protocol to construct chiral high yields with regio-, diastereo- enantioselectivities via Pd-catalyzed umpolung asymmetric allylic alkylation hydrazones monosubstituted allyl reagents by using Kündig-type N-heterocyclic carbene as the ligand. The control experiments revealed that reaction proceeds inner-sphere mechanism.
A wide range of alkyl-substituted allyl reagents, as well nonstabilized carbon nucleophiles, was successfully used for the first time in palladium-catalyzed asymmetric allylic alkylation reaction, affording corresponding alkylated products high yields with enantioselectivities. The usefulness protocol has been demonstrated by enantioselective synthesis an important chiral building block and enantiomer Dubiusamine A.
Abstract Using time‐slice experiments performed with version 4 of the Whole Atmosphere Community Climate Model (WACCM4) and satellite observations, we investigate hemispheric differences in, seasonal dependence of, water vapor transport into stratosphere in response to Indo‐Pacific warm pool (IPWP) sea‐surface temperature (SST) variations. Specifically, amplitude lower stratospheric (SWV) a warmer (cooler) IPWP (i.e., Niño [Niña]) occurs mainly boreal winter when SST forcing is identical for...
Enantioselective cyclopropanation of nitriles with allyl reagents was realized using Pd/NHC as a catalyst and the reasons for were investigated.
A palladium-catalyzed asymmetric Heck–Matsuda reaction of N-Boc-1,4-dihydroquinolines and aryl diazonium tetrafluoroborates is realized in moderate to high yields with enantioselectivities. The method provides an efficient route access optically active 2-arylhydroquinolines.
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Highlights:The tropical lower stratosphere water vapour (SWV) experiences a drying process during 1984-2020 in both linear and nonlinear perspectives.The Indo-Pacific warm pool (IPWP) is the main factor such of stratosphere.IPWP leads coldest point region cooler modulating SWV entry by enhancing equatorial waves.ABSTRACTA decreasing trend (30°S~30°N) stratospheric recent four decades (from 1984 to 2020) detected based on Stratospheric Water OzOne Satellite Homogenized (SWOOSH) measurements...
a 中国科学院上海有机化学研究所 金属有机化学国家重点实验室 上海 200032
In this paper, a low profile frequency selective absorber(FSA) with high selectivity reflection band and two absorption bands is proposed. This structure consists of layers air layer in the middle. The upper lossy Jerusalem-type surface, lower double patches-type impedance surface(HIS). Based on equivalent circuit model, analysis design are carried out .The simulation results show that rapid transition between band, absorptivity can reach 0.87 4.58-7.86GHz 11.58-17.86GHz. Besides, absorbing...
In this study, an absorptive partially reflective surface is designed to realize a high-gain, dual-band radar cross section (RCS) reduced Fabry-Perot resonator antenna. A single-layer multi-mode lossy Jerusalem-type frequency selective loaded onto the traditional in-band partial reflection and effective out-of-band absorption. By using form antenna, good radiation performance RCS reduction can be achieved simultaneously. The results of simulation show that peak gain antenna 19.67 dBi at 10...