Conformational investigation of diarylsulphones by Kerr effect and dipole moment methods
摘要:
Molar Kerr constants and electric dipole moments are reported for (C6H5)2SO2, (4-Cl-C6H4) (C6H5)SO2, (2,4,6-Me3C6H2) (4'-BrC6H4)SO2, (4-NO2C6H4)2SO2, (4-MeOC6H4) (4'-NO2C6H4)SO2, (2-MeOC6H4) (4'-NO2C6H4)SO2, (2-NO2C6H4) (4'-MeOC6H4)SO2 and (2-MeOC6H4) (2'-NO2C6H4)SO2 as solutes in dioxane solution at 298 K. The data are analysed in terms of the preferred conformations adopted in solution. In most cases these data are consistent with the presence, in dioxane, of orthogonal or planar-orthogonal conformers, or of a mixture of them. In the orthogonal rotamer both aromatic rings are approximately perpendicular to the C(Ar-) S-C(Ar) molecular reference plane whereas in the planar-orthogonal conformer one ring is coplanar and the other is orthogonal to the reference C(Ar)-S-C(Ar) plane.
A novel and efficient synthesis of sulfones was developed via a silver-promoted decarboxylative sulfonylation reaction between aromatic carboxylic acids and sodiumsulfinates for the first time. The approach features operational simplicity and good functional group compatibility and uses readily available starting materials. Furthermore, mechanistic studies reveal that the decarboxylative sulfonylation