Author: M. T. ZoecklerPublisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
Homogenous Catalytic Formation of Carbon-Nitrogen Bonds. 2. Catalytic Activation of the Silicon-Ntirogen Bond
Author: M. T. ZoecklerCarbon-nitrogen Bond Formation Via Catalytic Alcohol Activation
Author: Tao TanPublisher:
ISBN: 9789403400471
Category :
Languages : en
Pages : 147
Book Description
Silicon-Based Polymers and Materials
Author: Jerzy J. ChruĊcielPublisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110640139
Category : Technology & Engineering
Languages : en
Pages : 542
Book Description
Silicon based materials and polymers are made of silicon containing polymers, mainly macromolecular siloxanes (silicones). This book covers the different kinds of siliconbased polymers: silicones, silsesquioxanes (POSS), and silicon-based copolymers. Other silicon containig polymers: polycarbosilanes, polysilazanes, siloxane-organic copolymers, silicon derived high-tech ceramics: silicon carbide and oxycarbide, silicon nitride, etc. have also a very important practical meaning and a hudge number of practical applications. These materials make up products in a variety of industries and products, including technical and medical applicatons. Polycrystalline silicon is the basic material for large scale photovoltaic (PV) applications as solar cells. Technical applications of crystalline (c-Si) and amorphous (a-Si) silicon (fully inorganic materials), silicon nanowires are still quickly growing, especially in the fi eld of microelectronics, optoelectronics, photonics. and photovoltaics, catalysts, and different electronic devices (e.g. sensors, thermoelectric devices). This book is ideal for researchers and as such covers the industrial perspective of using each class of silicon based materials. Discusses silanes, silane coupling agents (SCA), silica, silicates, silane modified fillers, silsesquioxanes, silicones, and other silicon polymers and copolymers for practical applications as polymeric materials and very useful ingredients in materials science.
Catalytic Methods for Carbon-carbon and Carbon-nitrogen Bond Formation
Author: Stephen David RamgrenPublisher:
ISBN:
Category :
Languages : en
Pages : 511
Book Description
This dissertation describes the study of metal-catalyzed cross-coupling reactions to construct carbon-carbon and carbon-heteroatom bonds. The key feature of much of this work is the use of inexpensive Ni and Fe catalysts to enable the coupling of unconventional electrophilic substrates, specifically aryl O-sulfamates and O-carbamates. The ability to use O-sulfamates and O-carbamates in catalytic processes is notable, as these substrates are readily derived from phenols and can be used for directed arene functionalization. Chapter one provides a summary of the efforts towards using alcohol-based solvents for the Suzuki-Miyaura cross-coupling reaction. Emphasis is placed on the cross-coupling of heterocycles, which are commonly encountered in natural product synthesis and in the pharmaceutical sector. Chapters two, three, and four describe carbon-nitrogen bond forming reactions. Chapter two pertains to the nickel-catalyzed amination of sulfamates, which culminated in the synthesis of the antibacterial drug, linezolid. Chapter three covers the amination of aryl O-carbamates and their use in sequential functionalization/site-selective cross-couplings. Chapter four describes a more user-friendly variant of the amination reaction, which relies on a bench-stable Ni(II) precatalyst, rather than a more commonly used Ni(0) precatalyst. Chapters five, six, and seven focus on carbon-carbon bond formation via Fe-, Ni- and Pd-mediated processes. Chapter five pertains to iron-catalyzed couplings of sulfamates and carbamates to generate sp2-sp3 carbon-carbon bonds. This method can be used to assemble sterically-congested frameworks. Chapter six describes the nickel-catalyzed Suzuki-Miyaura reactions of halides and phenol derivatives in `green' solvents, which was applied to the preparative scale assembly of bis(heterocycles) using low nickel catalyst loadings. Chapter seven pertains to the acetylation of arenes using palladium catalysis, which provides a simple and efficient means for the construction of a variety of aryl methyl ketones.
Development of large diameter amorphous ceramic SiCN fibres from selective chemical cross-linked oligosilazanes
Author: Octavio-Jun Flores UrushimaPublisher: Cuvillier Verlag
ISBN: 3736948492
Category : Technology & Engineering
Languages : en
Pages : 164
Book Description
Gold and Silver Catalysis of Carbon-Nitrogen Bond Formation and Cycloaddition Reactions
Author: David Anthony CaprettoPublisher:
ISBN: 9781124717418
Category :
Languages : en
Pages : 131
Book Description
This dissertation describes four research topics all based on the catalytic reactivity of silver and gold complexes. Chapter I details work towards the development of a silver catalyzed nitrene transfer reaction with high activity for benzylic and even alkyl C-H bonds. Chapter II describes the development of a gold(III) catalyzed aryl C-N bond formation. Chapter III describes the synthesis and exploitation of a new diaziridine molecule for use in gold(I) catalyzed cycloaddition chemistry with terminal alkynes. Chapter IV describes efforts toward the natural product synthesis of oligomers based on the resveratrol molecule.
Developments and Applications of Methods for Palladium- and Copper-catalyzed Carbon-nitrogen Bond Formation
Author: Jeffrey Chih-Yeh YangPublisher:
ISBN:
Category :
Languages : en
Pages : 467
Book Description
The studies presented in this dissertation are aimed at the development and application of methodologies that enable carbon-nitrogen (C-N) bond formation catalyzed by late transition metals such as palladium and copper. The first part of this thesis focuses on the use of palladium catalysis for the construction of a carbon(sp2)-nitrogen bond in the context of a biphasic continuous-flow system (Chapter 1). The second part of this thesis describes the recent developments of copper-hydride (CuH) catalyzed asymmetric hydroamination for the formation of a-chiral carbon(sp3)-nitrogen bonds from olefins. This work includes the application of CuH catalysis to the synthesis of chiral N-alkyl aziridines (Chapter 2), and the discovery and development of novel electrophilic amines to enable CuH-catalyzed asymmetric hydroamination to directly access primary amines (Chapter 3). Part I. Chapter 1. Use of a "Catalytic" Cosolvent, N,N-Dimethyl Octanamide, Allows the Flow Synthesis of Imatinib with no Solvent Switch A general, efficient method for C-N cross-coupling has been developed using N,N-dimethyloctanamide as a cosolvent for biphasic continuous-flow applications. In addition to utilizing a proper co-solvent, the described method harnesses the superior mixing abilities of a stainless-steel powder packed tube reactor to efficiently couple a wide range of aryl/heteroaryl halides and aryl/heteroaryl/alkyl amines in a short period of time (
Catalytic Synthesis of Oligosilazanes. 2
Author: Claude BiranPublisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
Preliminary studies on transition metal catalyzed dehydrocoupling of Silicon hydrogen bonds with Hydrogen nitrogen bonds to form silicon nitrogen bonds, silazanes, and hydrogen are described. A number of transition metal complexes have been tested as catalyst precursors for the dehydrocoupling reaction. Of these, Ru2(CO)8(Et3Si)2 proved to be the most active homogeneous catalyst and Palladium particles produced by the in situ reduction of Pd(OAc)2 were the most active heterogeneous catalysts. The kinetics studies of the ruthenium catalyzed reaction of Et3SiH with primary amines, RNH2 were run at 70C in THF. The effects of changes in Et3SiH amine and catalyst concentrations on rates of reaction were examined. The data suggest that catalysis involves an extremely complex set of reaction were examined. The data suggest that catalysis involves an extremely complex wet of equilibria wherein the rate determining step is dependent on the steric requirements of the amine and fragmentation of the starting Ru3(CO)12 cluster. Keywords: Polysilazanes; Preceramic ploymers; Silicon hydrogen bond activation catalysis; Kinetic and mechanistic studies.
Catalyzed Carbon-Heteroatom Bond Formation
Author: Andrei K. YudinPublisher: John Wiley & Sons
ISBN: 3527633405
Category : Science
Languages : en
Pages : 541
Book Description
Written by an experienced editor widely acclaimed within the scientific community, this book covers everything fromo9xygen to nitrogen functionalities. From the contents: Palladium-Catalyzed Syntheses of Five-Member Saturated Heterocyclic and of Aromatic Heterodynes Palladium-Catalysis for Oxidative 1, 2-Difunctionalization of Alkenes Rhodium-Catalyzed Amination of C-H-Bonds Carbon-Heteroatom Bond Formation by RH(I)-Catalyzed Ring-Opening Reactions Transition Metal-Catalyzed Synthesis of Lactones and of Monocyclic and Fused Five-Membered Aromatic heterocycles the Formation of Carbon-Sulfur and Carbon-Selenium bonds by Substitution and Addition reactions catalyzed by Transition Metal Complexes New Reactions of Copper Acetylides Gold Catalyzed Addition of Nitrogen, Sulfur and Oxygen Nucleophiles to C-C Multiple Bonds. The result is an indispensable source of information for the Strategic Planning of the Synthetic routes for organic, catalytic and medicinal chemists, as well as chemists in industry.
Author: Shashank Shekhar