Claisen PowerPoint PPT Presentations

Rainer Ludwig Claisen (1851-1930) Developed the Claisen Condensation in 1887 What are the building blocks? sp2 orbitals p orbitals bond sp3 orbitals ...

Asymmetric Enantioselective Ireland-Claisen Rearrangement using a Chiral Boron Reagent ... of the intermediate boron enolate: E/E educts afford the threo (syn) ...

Claisen Ester Condensation (Intermolecular) and Dieckmann Cyclization ... Reaction Involving An Ester Enolate (Nucleophile) and An Ester (Electrophile) ...

Reactions of Enolate Anions: Enolates + Electrophiles II Condensations: Many Types, and (Other Reactions) Condensations: Aldol, Claisen, Dieckmann, Acetoacetic ...

A pericyclic reaction is characterized as a change in bonding relationships that ... Acyclic Chirality Transfer in the Claisen Rearrangement ...

Claisen and Cope rearrangements. Cope rearrangements and related: Beckman rearrangement ... RCONH2 reacts with Br2 and base. Gives high yields of arylamines and ...

thioester bond. Pyruvate Dehydrogenase ... Only cycle reaction with C-C bond formation; this is a Claisen condensation ... Two CH2-COO- Arms? a1. a2. c. d ...

Pr sentation du Mat riel : Vocabulaire savoir Adaptateurs Ampoules d canter Ampoules de coul e Ballons B chers B chners Claisen Colonnes de distillation

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Chapter 21: Ester Enolates

Aromatic Transition States - The Frontier-Orbital Method. Cycloaddition reactions are allowed only when all overlaps ... pyrolysis of esters (Problem 22.42) ...

Stork Enamine Reaction. Robinson Annulation Reaction. General Mechanism of ... net effect of Stork Enamine reaction sequence is the Michael addition of a ...

Enolates and Enamines Enamines Acylation at a position Enamines undergo acylation when treated with acid chlorides and acid anhydrides. Could this be made via a ...

Michael addition ( , -unsaturated carbonyl) Robinson Annulation (cyclic from Michael aldol) ... Enamines The Stork Reaction ...

Migration of a s-bond across a conjugated p-system ... Bruckner, Angew. Chem. Int. Ed. 1988, 27, 278 [2,3] Sigmatropic Rearrangements. Steric Effects ...

A proton on the carbon flanked by the two carbonyl groups is ... Keto esters are made by the reaction shown, which is called the ... (barbital; Veronal) ...

Organic Chemistry William H. Brown & Christopher S. Foote

Chapter 21 Reactions of a-Hydrogens: Condensation Reactions These images should be printed in color, if possible, otherwise the images are very faint!

ol. H3O - H2O. a,b-unsaturated aldehyde. aldols easily lose. water to form a. double bond ... Density - LUMO plots ( color scale 0.000 to 0.030 ) MORE ...

B. Keto-enol tautomerism. 1. base catalyzed. keto. Chapter 22. 5. 2. acid ... 3. racemization: keto-enol tautomerism in action. Chapter 22. 7. Chapter 22. 8 ...

B. Dehydration of the Aldol Product. Aldol addition product readily loses H2O: 2-butenal. Dehydration is unavoidable when the product is highly conjugated. 5 ...

Mono ... de Hidrogenos en a en Compuestos Mono- y Di-Activados. 4. pKa de algunos ... Generalmente el equilibrio est desplazado hacia la forma ceto. 8 ...

THE ENZYMES THAT ASSEMBLE ACETYL-CoA UNITS. USE A DECARBOXYLATION OF MALONYL-CoA ... STARTER. found in grapefruit. flowers, fruit and rind. as the 7-rhamnogylcoside ...

aromatic amino acids phenylalanine and tyrosine and to the ... RODENTICIDE (rat poison) causes internal. bleeding in cows. FLAVONOIDS. Plant Pigments ...

of Allyl Aryl Ethers. Allyl Aryl Ethers Rearrange on Heating ... 'conjugated electron system' is the allyl group. Sigmatropic Rearrangement. O. O. H. 24.14 ...

Title: PowerPoint Presentation - Organic Chemistry Fifth Edition Subject: Sections 24.1-24.3 Author: Francis A. Carey Last modified by: r r Created Date

Dieckmann Condensation Reaction Prepared by: Maram A. A. Amleh Table of Contents Cover Slide. Table of Content. Objectives. Background. Reaction and Mechanism.

Lecture 25 Chemical Sense in Metabolism

WEB OF KNOWLEDGE SCIENCE CITATION INDEX / WEB (session 2) ... Biochemistry / organic chemistry, etc. Each subject divided by publication type ...

Enolate Chemistry and Malonic Ester Synthesis ... Synthetic Polymers (less reactive esters and amides) Predicting Products Problems ...

An enolate ion adds as a nucleophile to the electrophilic acceptor ... Immediate addition of an alkyl halide to completes the alkylation reaction ...

Carbonyl compounds are both the electrophile and nucleophile in carbonyl condensation reactions ... 23.12 The Stork Enamine Reaction ...

Sigmatropna preme tanja. [1,n] Suprafacijalno i antarafacijalno preme tanje Nomenklatura, dozvoljena i zabranjena reakcija na osnovu aromati nosti prelaznog stanja ...

Flavonoids are thought to be antioxidants, and play a major role in our diet, preventing the ravages of aging caused by free-radicals. These compound have their ...

... compounds are both the electrophile and nucleophile in carbonyl condensation reactions ... carbonyl compound to enolate form so it is not an electrophile ...

A carbon acid is a compound with a relatively acidic. hydrogen ... The Stork Enamine Reaction. Enamines are used in place of enolates in Michael. reactions ...

(hydroxyl group) OH ( ) 2. ...

Szent-Gry gyi- Nobel prize 1937. a-ketoglutarate converted to succinate in muscle ... X. Oxaloacetate. NADH H NAD Oxidation. 9. Malate dehydrogenase. IX. ...

Title: Presentazione di PowerPoint Last modified by: nazzareno capitanio Document presentation format: Presentazione su schermo Other titles: Times New Roman Arial ...

Synthesis of methyl ketone 10. Synthesis of macrocycle 12 ... Synthesis of ketone 16. Wolff rearrangement. Synthesis of Dolabellatrienone 2. Conclusion ...

All about vacuum distillation , rotary evaporator and steam distillation. Uses , advantages and disadvantages of all.

Title: OC 22 Conjugated dienes Author: Bill Brown Last modified by: Bill Brown Created Date: 8/17/1997 10:49:57 AM Document presentation format: US Letter Paper

... -2,4-hexadiene is unreactive in Diels-Alder reactions because nonbonded interactions prevent it ... the Diels-Alder reaction is a pericyclic reaction ...

Chapter 15 Pericyclic Reactions ( ) (ref: : 17 ) (Wade: Chapter 15-11, 12 ) Three Pericyclic Reactions ( ) Electrocyclic ...

Nomenclature Properties Preparation reactions of Aldehydes and Ketones Characteristic reactions of Aldehydes and Ketones Carbanion related reactions

stabilized by conjugation of the alkene with the phenyl ring or the double ... group increases the electrophilicity of the conjugated system and allows ...

... Au-catalyzed Phenol Synthesis. 1) It offers a new possibility for the application of Gold-catalysis ... Proposed Mechanism for the Au(I)-Catalyzed Rearrangement ...

... base with an alkyl halide or tosylate. SN2 chemistry (see ... A free substituted alcohol, Ag2O and a 1o alkyl halide/tosylate. Oxymercuration (CHEM 210) ...

CHAPTER 21 PHENOLS AND ARYL HALIDES NUCLEOPHILIC AROMATIC SUBSTITUTION 21.1 STRUCTURE AND NOMENCLATURE OF PHENOLS Phenol: Compounds that have a hydroxyl group ...

the OH group of phenols cab participate in hydrogen bonding ... Resveratrol. 240. 24.8: Reactions of Phenols: Electrophilic Aromatic. Substitution. ...

KOLOKVIJUM PART 1 lab equipment (6) gap-filling (6) multiple choice (4) PART 2 Reporting orders and statements (3) Reporting questions (3) Conditional sentences (3 ...

Nomenclature Properties Preparation reactions of Aldehydes and Ketones Characteristic reactions of Aldehydes and Ketones Carbanion related reactions

Synthesis of Single Enantiomers How do chemists achieve the synthesis of single ... Synthesis of Single Enantiomers In a second strategy, asymmetric induction, ...

In most cases the keto form is favored at equilibrium. 99.98% 0.02% 2. Acid-Catalyzed Process ... Usually, the initially-formed -hydroxyketone dehydrates to ...

Nomenclature Properties Preparation reactions of Aldehydes and Ketones Characteristic reactions of Aldehydes and Ketones Carbanion related reactions

Carbonyl compounds like aldehydes, ketones and esters can also be ... 11. Stork Enamine Reactions: Use of enamines as enol equivalents. imine. enamine. 10 amine ...