Ti complexes assembled HMS as effective catalysts for epoxidation of alkene

Catalytic oxidation of cyclopentene to glutaraldehyde over WO3/Ti–HMS catalyst

“…Moreover, the Ti-HMS support is favorable to load more tungsten oxide that is active acid sites. Meanwhile, Ti-HMS supports also show the catalytic activity for the oxidation of alkene as reported in references [17,18]. It is possible that the interaction between WO 3 loaded and surface of the Ti-HMS affects the activity for the oxidation of cyclopentene.…”

“…It is possible that the interaction between WO 3 loaded and surface of the Ti-HMS affects the activity for the oxidation of cyclopentene. Therefore, it is reasonable to support that the catalyst transferred the active oxygen molecular from H 2 O 2 to cyclopentene and catalyzed the reactions of steps 1, 2 and 5 [7][8][9][10][11][16][17][18].…”

Heterogenization of [Ti(η5-C5HMe4)Cl3] on to MCM-41 and organomodified MCM-41 to form epoxidation catalyst

“…As can be observed, cyclopentadienyl titanium catalysts present comparable styrene conversions and slightly lower TOF values than the titanium tetraisopropoxo catalysts except in case of Ti(h 5 -C 5 HMe 4 )Cl 2 eCyPTSeHMDSeMCM-41 and Ti(h 5 -C 5 HMe 4 )Cl 2 eCyPTSeMTMSeMCM-41 that present the highest TOF values of 123 h À1 and 25 h À1 , respectively. Fu et al [37]. compared Ti (O i Pr) 4 and TiCl 4 grafted HMS as styrene epoxidation catalyst obtaining conversions of 30.1 and 10.2%, with TBHP as oxidant, and low TON values of 2 and 1, respectively.…”

Recent Developments in Epoxide Preparation

“…The Ti-MWW compared with conventional titanosilicates (TS-1, TS-2, Ti-Beta, Ti-MOR, Ti-MCM-41, etc.) [12][13][14] proves to be more effective in the epoxidation of linear alkenes, including functionalized ones, using H 2 O 2 as terminal oxidant. Post-synthesized Ti-MWW turns out to be the so far most active titanosilicate catalyst for alkene epoxidation.…”