Mn-tetraarylporphyrins bearing N-alkyl sulphonamido tails: Effect of the length and polarity of the chains on physical properties and reactivity

Manganese-complexes of a new series of tetraarylporphyrins, featuring both chlorine atoms in ortho, ortho' positions and N-mono- or N,N- disubstituted sulphonamido groups in meta on the meso-phenyls, were used as catalysts in the epoxidation of α-olefines in the presence of diluted (17.5%) H2O2 as primary oxidant. The catalytic efficiency of these catalysts is related to the polarity of the chains and the N,N- dialkylsulphonamido porphyrins turned out to be more reactive than the robust Mn-TDCIPP in the epoxidations of styrenes. (C) 2000 Elsevier Science B.V.