Dissertation > Excellent graduate degree dissertation topics show

Salen-Co and Sharpless-Ti Grafted on Nano-Silica and Core-shell Silica Surfaces

Author: ZhouJianBo
Tutor: FuZaiHui
School: Hunan Normal University
Course: Organic Chemistry
Keywords: Nano Silica The structure of the putamen Salen-Co Sharpless-Ti Epoxidation
CLC: O621.25
Type: Master's thesis
Year: 2006
Downloads: 58
Quote: 0
Read: Download Dissertation

Abstract


By asymmetric epoxidation reaction can having a prochiral carbon atom of the olefin into the epoxides with a chiral carbon atom, and then by ring-opening reaction or a functional group transformation between, can produce a series having different types of alcohols, glycols, alcohols, amines, etc. of the optically active compound. In the epoxidation reaction system, the most common catalyst system can mainly be divided into the Sharpless system and Jacobsen systems. Firstly, the use of silane reagent modified nano Silica, then take advantage of the suspension polymerization core - shell silica-styrene and methyl acrylate copolymer hybrid body carrier (or nuclear - shell silica-styrene and vinyl acetate ester copolymer hybrid the body carrier). Modulated by changing the ratio of two monomers and the total amount of the two monomers core - shell shell nature of the catalyst, in order to achieve the purpose of our experimental design, the main results are as follows. (1) as the carrier nano Silica and putamen Silica by chemical grafting method successfully prepared Immobilized Salen-Co catalyst. And by FT-IR, TG-DTA and TEM characterization were characterized by means of the preparation of the catalyst, Salen-Co type catalyst characterization results: significant C = N IR bands, putamen type catalyst the characteristic peaks of the benzene ring, an amide carbonyl group, such as a methyl group. The two types of core-shell type catalyst can be seen from the results of TG-DTA and TEM characterization than two ordinary catalyst weight loss, the particle size of the catalyst increased significantly. Investigated the catalytic performance of Salen-Co, cyclohexene and trans-stilbene as the reaction substrate (in which molecular oxygen as the oxidant, isobutyraldehyde as sacrificial aldehyde), from the catalytic results can be seen: catalytic cyclohexene oxidation reaction, core - shell type catalysts on the reaction rate and selectivity of epoxidized are superior to the silica-type catalyst; contrary, in the trans-stilbene epoxidation reaction, it is the latter is obviously superior to the former. The reason for this difference is likely with the shell surface of the polymer with two reactive substrate affinity differences significantly. (2) On the basis of the previous experiments, the use of the urging force of chemically grafted onto silica and nuclear chiral Salen-Co complexes - the shell-type silica-styrene methacrylate copolymer hybrid body carrier, and FT-IR, TG-DTA and TEM characterization methods were used to characterize the catalysts prepared. Epoxidation reaction was investigated by use of the trans-stilbene

Related Dissertations

  1. Organozinc reagents with α, α- dihalo ketones and halogenated research and Epoxidation of ketone,O621.25
  2. Epoxidation of olefins with high activity cobalt zeolite catalysts,O643.32
  3. Organic Hydrogen Phosphite or Hydrogen Phosphate Catalyed Friedel Crafts Amidoalkylation Reaction and Dinuclear Catalysts Applications in Asymmetric Reactions,O643.32
  4. 3 - (1 - Naphthyloxy ) -1,2 - epoxypropane hydrolytic kinetic resolution and Its Application,O626
  5. Studies on Genotoxicity of Two Novel Contraceptive Materials,R114
  6. Magnetic heteropoly acid catalyzed epoxidation performance of fatty acid methyl esters,TQ414
  7. The use of rapeseed oil produced bio-based polyol in polyurethane foam technology and applications,TQ328.3
  8. Gold-containing Mesoporous Molecular Sieves :Synthesis, Characterization and Application for Photocatalytic Epoxidation of Styrene,TQ203.2
  9. Polyisobutylene Epoxidation,TQ316.3
  10. Synthesis and Application of new hyperbranched polymers,TQ323.5
  11. Study Onasymmetric Syntheses of 3-methylthio Hexanal and 5 or 6-butyl-1, 4-dioxan-2-one,O621.34
  12. Study on Synthesis Technology of Biphenanthrol Dialkyl-ether,TQ243.4
  13. Synthesis of Novel N4 Tetradentate Click Ligands and Catalytic Properties of Their Complexes,O643.32
  14. Premixed oxyhydrogen flame burning prepared nano-silica technology research,TB383.1
  15. Theoretical Study on the Oxidation Reaction Mechanism of Two Organic Compounds,O621.254.1
  16. Epoxidation of Cyclohexene with Oxygen Basing on Zeolitic and Mesostructured Catalysts,TQ203.2
  17. Study Onasymmetric Syntheses of Opticallyactive α-(2-Methyl-3-furylthio) Ketones,O621.34
  18. The Study of Direct Gas-phase Epoxidation and Heterogeneous Catalysis of Hexafluoropropylene for the Synthesis of Hexafluoropropylene Oxide,TQ222.24
  19. Pharmaceutical wastewater treatment process design,X703
  20. The Study of Soybean Oil Epoxidated by Heterogeneous Catalyst,TS221
  21. Synthesis of Epoxyethylbenzene with No-Solvent Method,TQ241

CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Properties of organic compounds > Chemical properties of organic reactions
© 2012 www.DissertationTopic.Net  Mobile