Lecture2ExtraNotes

Lecture2ExtraNotes - Tacticity: Disubstituted ethylenes...

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Structural Isomerism O O O O H N O H N H N O O poly(acetaldehyde) O CH 3 O OH poly(ethylene glycol) poly(vinyl alcohol) poly(methyl methacrylate) poly(ethyl acrylate) poly( ε -caprolactam) poly(hexamethylene adipamide) T g = 206 K T g = 358 K T g = 243 K Chemical structure affects physical properties
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Diastereomers Diastereomers are non-enantiomeric isomers arising when more than one stereocenter is present
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Tacticity of 1,1-Disubstituted Ethylenes (ABC=CH 2 ) A A A A A B B B B B A B A B A B A B A B A A A B A B B B A B A B H H A B H H A B H H A B H H A B A B H H B A H H A B H H B A H H A B A B H H A B H H A B H H B A H H A B isotactic syndiotactic atactic
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Tacticity of compounds with chiral centers separated by more than two atoms O CH 3 CH 2 Isotactic Syndiotactic O O O O CH 3 CH 3 CH 3 O CH 3 CH 2 O CH 3 CH 2 O O CH 3 CH 2 O O O O CH 3 O CH 3 CH 2 O CH 3 CH 2 O O C CH 3 H CH 2 n Poly(oxypropylene)
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R' R' R R R R' R' R' R R R R' R ' R' R R R R' R' R' R' R' R ' R R R R' R' R' R R R R' R' R' R R R R' T rans - erythro - disotactic T rans - erythro - disyndiotactic T rans - threo -disotactic T rans - threo -disyndiotactic C is - erythro - disotactic C is - erythro - disyndiotactic C is - threo -disotactic C is - threo - disyndiotactic R ' R Tacticity of 1,4-Disubstituted butadienes-1,3 (tritactic compounds)
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Unformatted text preview: Tacticity: Disubstituted ethylenes (XC=CHY) Threodiisotactic: the two stereocenters have opposite configurations Erythrodiisotactic: the two stereocenters have the same configurations Threodisyndiotactic: the placement of the two stereocenters is syndiotactic; same as erythrodisyndiotactic C C C C C C C C C C C C C X X X X X X X Y Y Y Y Y Y H H H H H H H H H H H H H C C C C C C C C C C C C C X X X X X X X H H H H H H H H H H H H H Y Y Y Y Y Y C C C C C C C C C C C C C X H X H X H X Y H Y H Y H H X H X H X H Y H Y H Y H C C C C C C C C C C C C C X H X H X H X H Y H Y H Y H X H X H X H H Y H Y H Y Threodiisotactic Erythrodiisotactic Threodisyndiotactic Erythrodisyndiotactic 16...
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Lecture2ExtraNotes - Tacticity: Disubstituted ethylenes...

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