8 - 8.1 General Features of Elimination All elim rxns...

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8.1 General Features of Elimination All elim rxns involve loss of elements from the starting material to form a new bond in the π product. Alkyl halides undergo elim rxns w/ Bronsted-Lowry bases. The elements of HX are lost and an alkene is formed. Dehydohalogenation : removal of the elements of HX; one of the most common methods to introduce a bond and prepare an alkene. π -elimination β involves the loss of elements from 2 adjacent atoms: the carbon α bonded to the leaving group X, and the carbon β adjacent to it. Steps : The base (B:) removes a proton on the carbon, thus forming H-B β + . The electron pair in the C-H bond forms the new bond b/w the and carbons. β π α β The electron pair in the C-X bond ends up on halogen, forming the LG :X -- . To draw any product of dehydrohalogenation : Find the C – the sp α 3 hybridized C bonded to the LG. Identify all carbons with H atoms. β Remove the elements of H and X from the and carbons and form a bond. α β π 8.2 Alkenes – the products of Elimination Rxns
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This note was uploaded on 02/13/2010 for the course CH 221 taught by Professor Staff during the Spring '08 term at John Carroll.

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8 - 8.1 General Features of Elimination All elim rxns...

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