Titanium-catalysed oxidation of thianthrene 5-oxide in heterogeneous (zeolites) versus homogeneous media: electrophilic versus template-mediated oxygen transfer
W. Adam et al., Titanium-catalysed oxidation of thianthrene 5-oxide in heterogeneous (zeolites) versus homogeneous media: electrophilic versus template-mediated oxygen transfer, J MOL CAT A, 154(1-2), 2000, pp. 251-255
Large differences in the ratio of sulfide versus sulfoxide oxidation of thi
anthrene 5-oxide (SSO) have been observed for heterogeneous versus homogene
ous Ti-IV catalysts; whereas the Ti-doped zeolites (heterogeneous) oxidise
by means of an electrophilic species, sulfoxide coordination (template effe
ct) fos Ti(OiPr)(4) (homogeneous) masks the true electrophilic character of
the metal oxidant. (C) 2000 Elsevier Science B.V. All rights reserved.