6-26 It is important to analyze the structure of carbocations to consider if migration of any groups from adjacent carbons will lead to a more stable carbocation. As a general rule, if rearrangement would lead to a more stable carbocation, a carbocation will rearrange. (Beginning with this problem, only those unshared electons pairs involved in a particular step will be shown.) CH3 I (a) CH3-C-CH-CH3 I 1\ CH3 I� 1-+ CH3 I + CH3-y-y-CH3 CH3 H c�� nucleophilic attack on unrearranged carbocation
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