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Unformatted text preview: localized p-orbitals 90 o 90 o C C !" bond An energy barrier of close to 60 kcal/mol is estimated during rotation around the carbon-carbon double bond. Cis-Trans Isomerism in Alkenes The two compounds below with the same formula of C 2 H 2 Cl 2 illustrate this isomerism. C=C Cl Cl H H C=C Cl Cl H H cis-1,2-dichloroethene trans-1,2-dichloroethene " cis " ( Latin : "on this side") " trans " ( Latin : "across") MP -80 o C-50 o C BP 60 o C 48 o C dipole moment 1.90 D 0 D These isomers are sometimes called geometric isomers . The barrier of close to 60 kcal/mol means that rotation around the carbon-carbon double bond does not occur under ordinary conditions . This restricted rotation leads to a type of isomerism : the existence of different compounds with the same formula....
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.
- Summer '07
- Organic chemistry