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Unformatted text preview: relatively weak !-bond (~60 kcal/mol) is exchanged for a strong "-bond. (2) The !-electrons are exposed and are highly polarizable. Electrophiles are attracted to the exposed negative charge. C C + E + electrophile C C E + electrophilic attack on the easily accessible and polarizable !-electrons Typical electrophiles are positively charged species such as H + , R + , and metal cations, and Lewis acids such as BF 3 and AlCl 3 . (3) Carbocation intermediates are formed after electrophilic attack. C C : + H-X C C + H + X-carbocation The carbocation rapidly reacts with the nucleophile : C C + H X: + C X C H C X C H-...
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