'Aldol condensation' diaporamas de présentation

Chapter 20 Enols and Enolates

Chapter 20 Enols and Enolates. Aldehyde , Ketone , and Ester Enolates. O. CH 3 CH 2 CH 2 CH. Terminology. The reference atom is the carbonyl carbon. Other carbons are designated ? , ? , ? , etc. on the basis of their position with respect to the carbonyl carbon.

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Chapter 18 Enols and Enolates

Chapter 18 Enols and Enolates. 18.1 The ? -Carbon Atom and its pK a. O. CH 3 CH 2 CH 2 CH. Terminology. The reference atom is the carbonyl carbon. Other carbons are designated ? , ? , ? , etc . on the basis of their position with respect to the carbonyl carbon.

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Keto-enol tautomerization

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Chapter 20 Enolates / Other Carbon Nucleophiles

Chapter 20 Enolates / Other Carbon Nucleophiles. C-C bond formation is very important larger, more complex organic molecule can be made from smaller ones How? carbon nucleophile + carbon electrophile ?.

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Chapter 13 ? -Substitution and Condensations of Enols and Enolate

Chapter 13 ? -Substitution and Condensations of Enols and Enolate. Text 1: Chapter 22, p 1003-1056 Text 2: 11,13 ?. 13.1 Enols and enolate ions ??????????. Resonance-stabilized anion. Keto form ( ??? Stable). Enol form ( ???? unstable). ?????? Enolate ion. Resonance-stabilized cation.

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Addition and Condensation reactions of Enol and Enolate Ions

Addition and Condensation reactions of Enol and Enolate Ions. Properties of enol and enolate ions Tautomerization (acid/base) alpha substitution reactions halogenation, alkylation, condensation Conjugate addition reactions Dieckman cyclization Robinson annulation.

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Addition and Condensation reactions of Enol and Enolate Ions

Addition and Condensation reactions of Enol and Enolate Ions. Properties of enol and enolate ions Tautomerization (acid/base) alpha substitution reactions halogenation, alkylation, condensation Conjugate addition reactions Dieckman cyclization Robinson annulation.

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ALDEHYDES & KETONES (ALKANALS & ALKANONES)

ALDEHYDES & KETONES (ALKANALS & ALKANONES). alkane. alcohol. reduction. reduction. aldehyde ketone. addition product. nucleophilic addition. oxidation. carboxylic acid. Aldehydes and Ketones. Aldehydes and ketones are characterized by the the carbonyl functional group (C=O).

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Chapter 20: Enols and Enolates

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The Aldol Condensation

The Aldol Condensation. In the presence of a strong base, two molecules of aldehyde or ketone may combine to form a b -hydroxyaldehyde or a b -hydroxyketone . This reaction is called the aldol condensation. The Aldol Condensation. Example. Another Example. One More:.

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Capsaicin

Capsaicin. Aldehydes and ketones. Carbonyl Compounds. Short forms. Contain the carbonyl group C=O Aldehydes: R may be hydrogen, usually a carbon containing group Ketones: R contains carbon. Structures of Aldehydes and Ketones. 13.1 Structure and Physical Properties.

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Condensations

Condensations. Condensation reactions involve the formation of new carbon-carbon bonds The most common condensation reactions are between two aldehydes or ketones (aldol condensation) or between an ester and either a ketone or an ester (Claisen condensation)

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Chapter 18: Enols and Enolates

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Carbanions and Base-catalyzed Formation of Carbon-Carbon Bonds

Carbanions and Base-catalyzed Formation of Carbon-Carbon Bonds. Formation of carbon-carbon bond. 1. Free radical carbon. 2. Charged or polar carbon. shape of the carbanion. I. Formation and related principle of carbanion ( concepts and mechanisms) Review. conjugated with other

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Claisen condensation

Carbonyl compounds - reaction of the aldol type. Claisen condensation. reaction proceeds between aldehyd and an ester under base catalysis the base is usually the alcoholate of alcohol bound in ester. after reaction when acidified very often observe formation of a,b -unsaturated ester.

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Chem 341 Review for Finals Structure Determination

Chem 341 Review for Finals Structure Determination. NMR Chemical shifts, splitting patterns, integrations IR ROH, C=O Formula => # of Rings + Pi-Bonds. Chem 341 Review for Finals Structure and Bonding. s- Bonds & p- Bonds Resonance Structures Aromaticity Heterocycles

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CONJUGATE ADDITION

CONJUGATE ADDITION. MICHAEL ADDITION. Addition of Nucleophiles to Enones Conjugate Addition or Michael Addition. . . . -. -. :. :. :. :. :. +. +. :Nu. :Nu. 1,2-addition. 1,4-addition. Nu. conjugate addition. Nu. CONJUGATE ADDITION. . . -. :. :. :. -. H-OH. . :.

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CONJUGATE ADDITION

CONJUGATE ADDITION. MICHAEL ADDITION. Addition of Nucleophiles to Enones Conjugate Addition or Michael Addition. -. -. :. :. :. :. :. +. +. :Nu. :Nu. 1,2-addition. 1,4-addition. Nu. conjugate addition. Nu. CONJUGATE ADDITION. -. :. :. :. -. H-OH. :.

312 views • 15 slides