期刊
CATALYSTS
卷 11, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/catal11070756
关键词
molybdenum; aroylhydrazone; epoxidation; catalysis; organic solvent-free process; TBHP in decane; TBHP in water; DFT calculations
资金
- Croatian Government
- project CIuK
- Cohesion Operational Programme [KK.01.1.1.02.0016]
Molybdenum compounds containing benzaldehyde-based hydrazones were synthesized and studied for their solid-state structures. These compounds were utilized as catalysts for cyclooctene epoxidation, showing high activity and selectivity under different conditions.
Molybdenum compounds containing benzaldehyde-based hydrazones were obtained. The reaction in MeOH resulted with monomeric Mo complexes, [MoO2(L)(MeOH)], while the reaction in dichloromethane (DCM) provided oligomeric complexes, [MoO2(L)](n). The solid-state structures of the obtained compounds were investigated through Infrared Spectroscopy - Attenuated Total Reflection (IR-ATR), Thermogravimetric analysis (TGA), and via X-ray diffraction. The prepared molybdenum species were employed as cyclooctene epoxidation catalysts. TBHP (tert-butylhydroperoxide) in water and TBHP in decane were employed and compared as oxidants, with 0.25 mol% [Mo]. The catalyst activity and selectivity towards epoxide is >90% for all the reactions. The results have been linked to theoretical calculations, showing the importance of the first step, i.e., the transformation of [MoO2(L)(MeOH)] into the pentacoordinate [MoO2(L)].
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