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Notes - 5.8 Preparation of AlkeneszElimination...

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Unformatted text preview: 5.8 Preparation of AlkeneszElimination Reactions ,/~\. ,B-Elimination Reactions Overview: \§;./* Xe’Y x 1) dehydrogenation of alkanes: X = Y = H H1 2) dehydration of alcohols: X = H; Y = OH H10 3) dehydrohalogenation of alkyl halides: X = H; Y = Br, etc.\_\><%' Dehydrogenation Limited to industrial syntheses of ethylene, propene, 1,3-butadiene, and styrene It is important economically, but rarely used in laboratory-scale syntheses. Examples: A CH3CH3 @533. #1263on2 + H2 ?50°C 5.9— 5.13 Dehydration ofAlca/zols W Examples: CHSCHZQH 0&6 2:434: H20 “Rim. *1 Q OH HESQ O + H Q ~ ' u 149% ' 2 3C0. (?9~§T%) @st H so H3C\ Hfiee—g QH Egg; /C;—‘CH2 + H23 TW A gig; H36 (32%) 0123900 Q> 1% \Wk C .\/ +0 C7< é” Omn- W 4m Meow ...
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