Epoxidation of DL-limonene using an indenyl molybdenum(II) tricarbonyl complex as catalyst precursor

Investigation of the reaction of [Cp*2M2O5] (M = Mo, W) with hydrogen peroxide and tert-butylhydroperoxide in MeCN; implications for olefin epoxidation catalyzed by organomolybdenum and organotungsten compounds

“…For the [Cp*2Mo2O5]/TBHP system, on the other hand, it cannot be completely excluded that the organometallic intermediates generated in the initial stages of the [Cp*2Mo2O5] oxidative degradation process continues to be responsible for part of the catalytic activity of the aged solutions, but it seems more likely that the predominant non-organometallic degradation products are also at least in part responsible for the catalytic effect. These results are closely related to those reported by Colbran et al [36], as already mentioned in the Introduction, and hint to the possible intervention or even dominant contribution of non-organometallic degradation products also in the previously published catalytic studies making use of organometallic precatalysts [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28], most of which were carried out with compounds of molybdenum and with TBHP/decane as oxidant.…”

“…Kühn and Romão later showed that [Cp*MoO2Cl] as well as analogues with differently substituted (η 5 -C5R5) ligands can be more conveniently generated in situ from the tricarbonyl complex [(η 5 -C5R5)MoCl(CO)3] and TBHP [13]. This opened the way to the generation of alkylmolybdenum(VI) analogues by oxidation of a variety of [(η 5 -ring)Mo(R)(CO)3] precursors and these compounds have been thoroughly investigated as olefin epoxidation catalysts [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Desulfurization of model and real fuels by extraction and oxidation processes using an indenylmolybdenum tricarbonyl pre‐catalyst

“…Untreated diesel and jet fuel samples containing 2300 and 1100 ppm S, respectively, were supplied by Galp. The complex [ η 5 ‐IndMo(CO) 3 Me] ( 1 ) was prepared as described previously …”

“…Herein, we report on the use of the indenyl complex [ η 5 ‐IndMo(CO) 3 Me] (Figure ) for the ODS of model and real liquid fuels. This complex was chosen due to the previous reports of its distinctive reactivity in, for example, CO insertion reactions, and catalytic epoxidation of limonene . A comparative analysis indicates that the η 5 ‐indenyl complex may be a better precursor for ODS than its η 5 ‐cyclopentadienyl counterpart.…”

Oxidation of limonene over molybdenum dioxide-containing nanoporous carbon catalysts as a simple effective method for the utilization of waste orange peels

“…Molybdenum-containing catalysts for limonene oxidation were described by some authors. They used very sophisticated materials, such as, polybenzimidazolesupported Mo(VI) [31], dioxo(l-oxo)molybdenum(VI) dimer [32], dichlorodioxomolybdenum(VI)-pyrazolylpyridine [33], indenyl molybdenum(II) tricarbonyl complex [34], molybdenum peroxo complexes [35] or Keggin heteropolycompounds [36]. However, catalysts in the form of MoO 2 , supported on the activated carbon EuroPh carrier, have not been previously described in the literature.…”