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Treatment of α-silyl-α,β-unsaturated enones, readily preparable as regio- and stereodefined compounds in high yields, with either 2 equiv. of ICl or one equiv. each of ICl and AlCl 3 provides the corresponding α-iodo-α,β-unsaturated enones in high yields.
Treatment of pentadienol-Fe(CO) 3 complexes, having alkene functionality in the side chain, with boron trifluoride, results in a stereospecific cyclization by reaction of the alkene with a stabilized carbocation intermediate; the stereochemical outcome was confirmed by X-ray structure determination of one of the products.
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