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The cyclic 1,3-dicarbonyl compounds undergo smooth cyclization with aryl propargyl alcohols in the presence of 10mol% indium tribromide in refluxing dichloroethane to produce 2,4-diarylpyran derivatives in good yields with high selectivity.
A variety of alkenes are converted into the corresponding α-fluoroamides in high yields by selectfluor TM in the presence of 10mol% of InF 3 in nitrile solution. α-Bromoamides are obtained with NBS in the presence of 10mol% InBr 3 under similar conditions. The use of Lewis acid in haloamidation significantly improved the yields and reaction rates.
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