Sheng Xu

Name: 许胜; Xu, Sheng

Organization: East China University of Science and Technology , China

Department:

Title: Associate Professor(PhD)

Chemicals
References

Catalytic domino amination and oxidative coupling of gold acetylides and isolation of key vinylene digold intermediates as a new class of ditopic N-heterocyclic carbene complexes

Co-reporter:Haifeng Chen;Jiwei Wang;Zejun Hu;Min Shi;Jun Zhang

Chemical Communications 2017 vol. 53(Issue 78) pp:10835-10838

Publication Date(Web):2017/09/28

DOI:10.1039/C7CC06069F

A catalytic domino amination and oxidative coupling of in situ prepared gold acetylides has been developed for the synthesis of abnormal NHC (aNHC) gold complexes, and key vinylene digold intermediates are isolated and structurally characterized.

Chemical conversion in 1-butelene hydroformylation catalyzed by the (Ar)3P/[Rh] system

Co-reporter:Jing Wang;He Li;Yuling Zhu;Yan Zhao

Reaction Kinetics, Mechanisms and Catalysis 2017 Volume 122( Issue 2) pp:1049-1062

Publication Date(Web):05 September 2017

DOI:10.1007/s11144-017-1255-2

In order to improve the selectivity of 2-methybutanal in the 1-butelene hydroformylation reaction, triarylphosphine ligands [(CnH2n+1–C6H4)3P (n = 4, L3; n = 6, L4; n = 8, L5; n = 10, L6)] are prepared by Friedel–Crafts alkylation reactions and characterized by 1H NMR, 13C NMR, 31P NMR and HRMS. When combined with Rh(acac)(CO)2, the L/[Rh] systems show high catalytic activity for the hydroformylation of 1-butelene. The influences of different substituents on the catalytic behavior are studied, and the effects of the molar ratio of [P]/[Rh], reaction temperature, reaction time and pressure of CO/H2 on the yield of 2-methylbutanal are also investigated. When the ratio of [P]/[Rh] = 3, the content of 2-methylbutanal in carbonyl products reaches 48.1%. It is surprising to find the intermediate conversion in 1-butelene hydroformylation reaction and the mechanism is proposed and discussed.

Synthesis of double silylene-bridged binuclear metallocenes and their cooperation effect during ethylene polymerization and ethylene/1-hexene copolymerization

Co-reporter:Puke Mi;Liangduan Qu;Zhang Deshun;Chen Qian;Wang Sihan

Journal of Applied Polymer Science 2011 Volume 121( Issue 1) pp:21-26

Publication Date(Web):

DOI:10.1002/app.33574

Abstract

Novel double silylene-bridged binuclear Group 4 metallocene complexes [(η⁵-C₅H₅)MCl₂]₂[μ, μ-(SiMe₂)₂ (η⁵-RC₅H₂)₂] [R = Me, M = Zr (1); R = allyl, M = Ti (2); R = allyl, M = Zr (3); R = ⁿBu, M = Ti (5); R = Me₃Si, M = Zr (6)] and [(η⁵-CH₃C₅H₄)ZrCl₂]₂[μ, μ-(SiMe₂)₂ (η⁵-allyl-C₅H₂)₂, (4)] were synthesized by the reaction of CpMCl₃ (M = Ti, Zr) with [μ, μ-(SiMe₂)₂ (η⁵-RC₅H₂)₂]^2- (L^2-) in THF, and they were all well characterized by ¹H-NMR, MS, and EA. When activated with methylaluminoxane (MAO), this series complexes are active catalysts for Ethylene polymerization (Complex 3, 3.86 × 10⁶ g-PE/mol-M h, Al/Zr = 500) and copolymerization of ethylene with 1-hexene (Complex 3,30.87 × 10⁵ g-polymer/mol-M h, 1-hexene content in polymer 2.34 mol %, Al/Zr = 1000). The result of polymerization implies that there is a cooperative effect between the two metals in the double-bridged binuclear molecules. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011