CHEM 2211 1st Edition Lecture 18 Outline of Last Lecture I II III IV Carbocation stability Addition of hydrogen halide to alkene Transition state structures Electrophilic addition reactions are region selective Outline of Current Lecture I II III IV Addition of water to alkenes Addition of alcohol to alkenes 1 2 hydride shif Methyl shif Current Lecture I Addition of water to alkenes A Alkenes don t readily react with water they require an acid catalyst generally H2SO4 B Reaction is called hydration C Overall the reaction is the addition of the electrophile to one carbon and the nucleophile to another D Final product is an alcohol E Example II Addition of alcohol to alkenes A Requires a catalyst and the product is an ether B Same mechanism as hydration but the nucleophile is R OH instead of H2O C Example III 1 2 hydride shif A The carbocation rearranges itself in order to become more stable B A hydride H move to an adjacent carbocation in order to stabilize the molecule C Example IV Methyl shif A Like 1 2 hydride shif but a methyl moves instead of a H ion B Example
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