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DOI: 10.1055/s-0031-1289998
Cyclic Aromatic Analogues of the Hendrickson Reagent; NMR Studies and Electrophilic Properties
Publication History
Publication Date:
22 December 2011 (online)
Abstract
Two novel cyclic aromatic analogues of the Hendrickson ‘POP’ reagent, 1,1,3,3-tetraphenyl-1,3-dihydro-2,1,3-benzoxadiphosphole-1,3-diium bis(trifluoromethanesulfinate) and bis(trifluoromethanesulfonate), have been readily prepared by the treatment of 1,2-bis(diphenylphosphino)benzene or 1,2-bis(diphenylphosphoryl)benzene, respectively, with trifluoromethanesulfonic anhydride in dichloromethane. ³¹P and ¹9F NMR studies indicated that while the latter complex is formed as the sole product, the former species was shown to be the predominant component in equilibrium with 1-(diphenylphosphino)-2-[diphenyl(trifluoromethylsulfonyloxy)phosphonio]benzene trifluoromethanesulfinate and 1,2-bis[diphenyl(trifluoromethylsulfonyloxy)phosphonio]benzene bis(trifluoromethanesulfinate). The dehydrating ‘POP’ systems were exploited in the conversion of aldoximes into nitriles. The dehydration occurred rapidly at room temperature and produced high yields with a variety of alkyl- and arylaldoximes, tolerating a wide range of substrates and functional groups.
Key words
1,2-bis(diphenylphosphino)benzene - 1,2-bis(diphenylphosphoryl)benzene - trifluoromethanesulfonic anhydride - Hendrickson reagent - dehydration - aldoximes - nitriles
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