tailieunhanh - Chapter 6: CONJUGATED ALKADIENES

Reactions of isolated dienes are just like those of alkenes. Reactivity of the dienophile is increased if 1 or more electron-withdrawing groups are present. In order to participate in a Diels-Alder reaction, the diene must be in an s-cis conformation. | ORGANIC CHEMISTRY Dr Nam T. S. Phan Faculty of Chemical Engineering HCMC University of Technology Office: room 211, B2 Building Phone: 8647256 ext. 5681 Email: ptsnam@ Chapter 6: CONJUGATED ALKADIENES A non-polar molecule Reactions of isolated dienes are just like those of alkenes NOMENCLATURE OF ALKADIENES PREPARATION OF 1,3-ALKADIENE Dehydrogenations Eliminations of unsaturated alcohols & alkyl halides ELECTROPHILIC ADDITION REACTIONS Reaction mechanism: DIELS-ALDER REACTIONS Reactivity of the dienophile is increased if 1 or more electron-withdrawing groups are present Partial positive charge Stereochemistry Racemic mixture In order to participate in a Diels-Alder reaction, the diene must be in an s-cis conformation C1 & C4 are too far apart to react with the dienophile Polymerizations | ORGANIC CHEMISTRY Dr Nam T. S. Phan Faculty of Chemical Engineering HCMC University of Technology Office: room 211, B2 Building Phone: 8647256 ext. 5681 Email: ptsnam@ Chapter 6: CONJUGATED ALKADIENES A non-polar molecule Reactions of isolated dienes are just like those of alkenes NOMENCLATURE OF ALKADIENES PREPARATION OF 1,3-ALKADIENE Dehydrogenations Eliminations of unsaturated alcohols & alkyl halides ELECTROPHILIC ADDITION REACTIONS Reaction mechanism: DIELS-ALDER REACTIONS Reactivity of the dienophile is increased if 1 or more electron-withdrawing groups are present Partial positive charge Stereochemistry Racemic mixture In order to participate in a Diels-Alder reaction, the diene must be in an s-cis conformation C1 & C4 are too far apart to react with the dienophile Polymerizations . | ORGANIC CHEMISTRY Dr Nam T. S. Phan Faculty of Chemical Engineering HCMC University of Technology Office: room 211, B2 Building Phone: 8647256 ext. 5681 Email: ptsnam@ Chapter 6: CONJUGATED ALKADIENES A non-polar molecule Reactions of isolated dienes are just like those of alkenes NOMENCLATURE OF ALKADIENES PREPARATION OF 1,3-ALKADIENE Dehydrogenations Eliminations of unsaturated alcohols & alkyl halides ELECTROPHILIC ADDITION REACTIONS Reaction mechanism: DIELS-ALDER REACTIONS Reactivity of the dienophile is increased if 1 or more electron-withdrawing groups are present Partial positive charge Stereochemistry Racemic mixture In order to participate in a Diels-Alder reaction, the diene must be in an s-cis conformation C1 & C4 are too far apart to react with the dienophile Polymerizations | ORGANIC CHEMISTRY Dr Nam T. S. Phan Faculty of Chemical Engineering HCMC University of Technology Office: room 211, B2 Building Phone: 8647256 ext. 5681 Email: ptsnam@ Chapter 6: CONJUGATED ALKADIENES A non-polar molecule Reactions of isolated dienes are just like those of alkenes NOMENCLATURE OF ALKADIENES PREPARATION OF 1,3-ALKADIENE Dehydrogenations Eliminations of unsaturated alcohols & alkyl halides ELECTROPHILIC ADDITION REACTIONS Reaction mechanism: DIELS-ALDER REACTIONS Reactivity of the dienophile is increased if 1 or more electron-withdrawing groups are present Partial positive charge Stereochemistry Racemic mixture In order to participate in a Diels-Alder reaction, the diene must be in an s-cis conformation C1 & C4 are too far apart to react with the dienophile Polymerizations .

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• conjugated alkadienes