Oxidation-dependent Lewis acidity in chalcogen adducts of Sb/P frustrated Lewis pairs

Abstract

Sb(iii) to Sb(v) oxidation increases the Lewis acidity of the Sb atom of (F5C2)2SbCH2P(E)(tBu)2 (E = O, S, Se, Te). This “switch to strong” interaction between antimony and chalcogen atoms deforms the backbone while a four-membered cycle is formed.