Fluoride Anion Chelation by a Bidentate Stibonium–Borane Lewis Acid
作者:Casey R. Wade、François P. Gabbaï
DOI:10.1021/om200499y
日期:2011.9.12
The stibonium-borane [o-(Ph2MeSb)(Mes(2)B)C6H4](+) (4(+)) has been synthesized and isolated as a triflate salt. Competition experiments carried out with [o-(Ph2MeP)(Mes(2)FB)C6H4] indicate that 4(+) exhibits a much higher fluoride affinity than its lighter phosphorus congener. Structural studies show that the higher fluoride affinity of 4(+) is correlated to the Lewis acidity of the stibonium center, which engages the boron-bound fluoride anion in the formation of a B-F -> Sb bridge. These results illustrate that the Lewis acidity of main-group onium ions increases as the group is descended.