Recent Developments in Allene Chemistry PDF Download
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Author:
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Category :
Languages : en
Pages : 23
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 23
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Book Description
Author: Hye Jung Han
Publisher:
ISBN:
Category : Allene
Languages : en
Pages : 304
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Author: Carmen Hernández Cervantes
Publisher: Universidad Almería
ISBN: 8416642109
Category : Science
Languages : en
Pages : 329
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Book Description
This thesis deals with the Ti(III) catalyzed synthesis of exocyclic allenes and the development of new titanocene complexes. It is structured in six chapters: Chapter 1 is a general introduction about the generation and reactivity of [TiCp2Cl]. A review about the different [TiCp2Cl] catalyzed or promoted reactions reported to date, is included. Chapter 2 is divided in introduction and results and discussion. In the introduction, an overview about the promoted or catalyzed methodologies, already available for the synthesis of α-allenols, is included. Results and discussion section is sub-divided in other two parts. The first one describes the synthesis of carbocyclic or nitrogen heterocyclic precursors bearing a propargyl halide and a carbonyl group. Next, the [TiCp2Cl] catalyzed synthesis of exocyclic allenols is studied. Additionally, a mechanistic study through deuterium incorporation and reaction of secondary propargyl halide precursors is performed. In the second part, the preparation of oxygen precursors and its cyclization are studied. In chapter 3, there is an introduction about enantioselective syntheses using chiral titanocene catalysts. The results and discussion section deals with the enantioselective cyclization of some of the precursors previously prepared using precatalyst (R,R)-ethylenebis(4,5,6,7-tetrahydro-1-indenyl) titanium(IV), also known as Brintzinger complex. A formal synthesis of the alkaloid (})-stemoamide is carried out in chapter 4, being the key step for this synthesis the generation of an α-allenol derivative through a [TiCp2Cl] catalyzedcyclization. This chapter is also divided in an introduction, in which a review about the different methods of synthesis of stemoamide are included, and results and discussion. Chapter 5 compiles the project that I have developed during my research stay at University of Bonn, under the supervision of Prof. Gansauer. The target of this project was to develop an azide functionalized short linker titanocene derivative with the aim of linking it to a surface by click chemistry. The chapter is divided in introduction and results and discussion. In the introduction the different methodologies for the synthesis of titanocene derivatives are reviewed. This section also includes the background in which this project is based. Chapter 6 includes the experimental part. In this chapter all reactions performed during the development of this thesis, as well as the spectroscopic characterization of compounds, are compiled.
Author: Bin Tan
Publisher: John Wiley & Sons
ISBN: 3527347127
Category : Science
Languages : en
Pages : 338
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Book Description
Axially Chiral Compounds Explore this comprehensive and current volume summarizing the characteristics, synthesis, and applications of axial chirality Appearing widely in natural products, biologically active molecules, asymmetric chemistry, and material science, axially chiral motifs constitute the core backbones of the majority of chiral ligands and organocatalysts in asymmetric catalysis. In a new work of particular relevance to synthetic chemists, Axially Chiral Compounds: Asymmetric Synthesis and Applications delivers a clearly structured and authoritative volume covering the classification, characteristics, synthesis, and applications of axial chirality. A must read for every synthetic chemist practicing today, the book follows the development history, research status, and applications of axial chirality. An introductory chapter familiarizes the reader with foundational material before the distinguished authors describe the different classes and the synthesis of axial chiral compounds used in asymmetric synthesis. The book concludes with a focus on the applications of chiral ligands, chiral catalysts, and materials. Readers will also benefit from the inclusion of: A thorough introduction to asymmetric synthesis, including biaryls atropisomers, heterobiaryls atropisomers, and non-biaryls atropisomers Explorations of chiral allene, spiro skeletons, and natural products Practical discussions of asymmetric transformation, chiral ligands, and chiral catalysts An examination of miscellaneous applications of axially chiral compounds Perfect for organic chemists, chemists working with or on organometallics, catalytic chemists, and materials scientists, Axially Chiral Compounds: Asymmetric Synthesis and Applications will also earn a place in the libraries of natural products chemists who seek a one-stop reference for compounds exhibiting axial chirality.
Author: Norbert Krause
Publisher:
ISBN:
Category : Allene
Languages : en
Pages : 576
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 328
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Book Description
Author: Norbert Krause
Publisher: Wiley-VCH
ISBN:
Category : Science
Languages : en
Pages : 616
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Book Description
In this two-volume handbook, the editors Norbert Krause and A. Stephen K. Hashmi present all the important aspects and facts related to this hot topic. The treatment covers the whole range from the synthesis and classification via reactions right up to possible applications in the synthesis of natural products and drugs. With their excellent contributions an international team of outstanding authors highlight the multifarious uses and classes of allenes, making this an indispensable work for every organic chemist. From the Table of Contents: SYNTHESIS OF ALLENES Synthesis of Allenes by Isomerization Reactions Metal-Mediated Synthesis of Allenes Transition-Metal-Catalyzed Synthesis of Allenes Enantioselective Synthesis of Allenes SPECIAL CLASSES OF ALLENES Allenic Hydrocarbons - Preparation and Use in Organic Synthesis Cyclic Allenes Acceptor-Substituted Allenes Donor-Substituted Allenes Synthesis and Reactions of Allenylmetal Reagents REACTIONS OF ALLENES Ionic Additions to Allenes Fundamentals and Application of Free Radical Addition to Allenes Cycloadditions of Allenes Cyclizations of Allenes Transitions-Metal-Catalyzed Cross Couplings of Allenes Transitions-Metal-Catalyzed Cycloisomerizations of Allenes Transition-Metal-Catalyzed Addition/Cycloadditions of Allenes Oxidation of Allenes APPLICATIONS Allenic Natural Products and Phamaceuticals Allenes in Natural Product Synthesis Enyne-Allenes
Author: Shinsuke Inuki
Publisher: Springer Science & Business Media
ISBN: 4431540431
Category : Science
Languages : en
Pages : 115
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Book Description
The author has developed novel methodologies for highly efficient construction of functionalized heterocycles by palladium-catalyzed domino/cascade cyclization of allenes and related compounds containing appropriate nucleophilic group(s). Based on these methodologies, enantioselective total syntheses of bioactive natural products, pachastrissamine (26% overall yield in seven steps), lysergic acid (4.0% overall yield in fifteen steps), lysergol (3.6% overall yield in fifteen steps) and isolysergol (8.2% overall yield in eleven steps) have been achieved. These are more facile synthetic route than those previously reported. These findings would contribute to the development of efficient synthetic methods for biologically active compounds containing a complex structure.
Author: Norbert Krause
Publisher:
ISBN:
Category : Allene
Languages : en
Pages : 576
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Book Description
Author: Ramon Rios Torres
Publisher: John Wiley & Sons
ISBN: 1118308638
Category : Science
Languages : en
Pages : 422
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Book Description
The Pauson-Khand reaction is an important reaction in the field of organic chemistry. It involves the transition-metal catalysed cycloaddition of an alkyne, an alkene and carbon monoxide, to produce cyclopentenones. The importance of this reaction originates from its high value in transforming simple components into the synthetically useful cyclopentenone unit, in which a high degree of molecular complexity can be achieved in a single step, with impressive stereochemical and regiochemical control. The Pauson-Khand Reaction investigates the nature and many variations of this reaction. Topics covered include: the mechanisms of Pauson‐Khand-type reactions non chiral intramolecular and intermolecular versions of Pauson‐Khand reactions asymmetric Pauson‐Khand reaction using chiral auxiliaries the enantioselective Pauson‐Khand reaction Pauson‐Khand reactions catalysed by metals other than cobalt unconventional Pauson‐Khand reactions the Pauson‐Khand reaction in total synthesis Presenting a comprehensive overview of this fundamental reaction, The Pauson-Khand Reaction will find a place on the bookshelves of any organic or organometallic chemist.
