Abstract
Analytically pure novel dibenzylsulfanes 2a,b were synthesized by established reactions. Their oxidation by hydrogen peroxide resulted in the formation of the corresponding sulfones 3a,b , which were isolated in high yields. Analogously, the new bis-sulfone 7 was prepared starting from bis-bromo derivative 4 via bis-sulfane 6 . The sulfones obtained reacted readily with bis-imidoylchlorides 8 , yielding highly substituted dihydrothiophene-S,S-dioxides of type 9 and 10 . Due to their vicinal amino-imino substructures, these cyclic sulfones proved to be excellent chelating ligands, exemplified by the preparation of the palladium complex 11 .
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