摘要:
Biphenyl- and terphenyl-based recyclable trivalent iodine reagents, such as 4-bromo-4'-(diacetoxyiodo)biphenyl, 4,4'-bis(diacetoxyiodo)biphenyl, 1,4-bis [4-(diacetoxyiodo)phenyl] benzene, 4-bromo-4'-[(hydroxy)(tosyloxy)iodo]biphenyl, 4,4-bis[(hydroxy)(tosyloxy)iodo]biphenyl, were simply prepared and their reactivities for the oxidative rearrangement of ketones to esters, TEMPO-mediated oxidation of alcohols to aldehydes or ketones, oxidative dealkylation of N-alkylsulfonamides to sulfonamides, and alpha-tosyloxylation of ketones were compared with p-(diacetoxyiodo)toluene and p- [(hydroxy) (tosyloxy)iodo] toluene to show the same reactivities and, moreover, the biphenyl- and terphenyl-based iodoarenes formed were recovered by simple filtration of the reaction mixture in every reaction. Thus, these biphenyl- and terphenyl-based trivalent iodine reagents can be used as the recyclable reagents. (c) 2006 Elsevier Ltd. All rights reserved.