An Estimate of the Reduction Potential of B(C6F5)3 from Electrochemical Measurements on Related Mesityl Boranes
摘要:
MesB(C6F5)(2) (1) has been prepared from MesMgBr and FB(C6F5)(2)(OEt2)-O-., while Mes(2)B(C6F5) (2) is readily available from CuC6F5 and Mes(2)BBr. The reduction potential E degrees of 1 vs Cp2Fe0/+ in THF is - 1.72 V, while that of 2 is -2.10 V, and that Of Mes(3)B (3) is -2.73 V. B-11 and H-1 NMR show that neither I nor 2 binds THF significantly. These results have been used to estimate the reduction potential of B(C6F5)(3) in THF as -1.17 V vs Cp2Fe0/+ or as -0.64 V vs SCE.