A palladium-catalyzed iodoalkynation of norbornene has been realized with the use of alkynyl iodides 1, which is found to be strongly solvent-dependent. MeCN favors 1,7-iodoalkylation product 3 while CCl(4) leads to 1,2-iodoalkylation product 4.
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Liu et al. (2011) studied this question.
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