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SCAN0022 - Leaving group becomes a stable anion i.e l Br Cl...

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Unformatted text preview: Leaving group becomes a stable anion i.e. l. Br, Cl not F b) hydrogen on fl—carbon 0) strong base: 1° t-BuOK, 3°, 2° CH3CH20Na, CH30Na d) H and X must be in same plane preferably ANTI (anti coplanar) Carbocaiions can... ' react with n'ucleophiles - lose a proton from the B-carbon to form an alkens - rearrange (less stable to more stable) Ch. 6: Reactions of Alkenes: Addition Reactions The characteristic reaction of alkenes is addition to the double bond. \ / 5+5' I I 0:0 + E-Y ——> E—C—C—Y /\ || 1) Hydrogenation (Addition of H-H) yields alkanes Conditions: H2, Pt, EtOH (Also Pd. Ni, Rh. Ru) Alkene Stability more substituted = more stable W: than cis Hydrogenation is a stereospecific syn addition . hydrogenation is stereoselective, corresponding to addition to less crowded face of double bond ...
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