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The typical procedure using benzyl alcohol as the model substrate
was as follows: benzyl alcohol (1 mmol) and Ru(mpbp)(pydic)
(1 Â 10À3 mmol, 0.1 mol% based substrate) were added into a
reaction tube. The reactor containing this mixture was stirred in an
oil bath at room temperature, and then 30% H2O2 (3.0 mmol) was
slowly dropped in. The resulting system was stirred for 60 min.
At the end of the reaction, the resulting products and the
unreacted substrate were extracted by using dichloromethane
three times. The extracted liquid mixture was analyzed by GC
and GC-MS. GC analyses were performed on a Shimadzu GC-2010
plus chromatograph equipped with an Rtx-5 capillary column
(30 m  0.25 mm  0.25 mm). GC-MS analyses were recorded
on a Shimadzu GCMS-QP2010 chromatograph equipped with an
Rxi-5ms capillary column (30 m  0.25 mm  0.25 mm). The
organic phase was dried with MgSO4, and the product was purified
by column chromatography (silica as a stationary phase and CHCl3
as an eluent). The yield of benzaldehyde (499.5 purity) was 92%.
Other products were obtained following the same purification
procedures.
Conclusions
Efficient alcohol oxidation was catalyzed by using Ru(mpbp)(pydic)
in the presence of hydrogen peroxide as an oxidant. Both primary
and secondary alcohols were oxidized to their corresponding
carbonyl compounds in good yield. The influence of various
reaction parameters, such as solvent, catalyst and oxidant amount
on the activity and selectivity was evaluated. The in situ UV-vis
spectroscopy studies indicated generation of Ru–oxo species
during the oxidation process. A plausible mechanism for the
catalytic oxidation of the alcohol process was proposed.
Conflicts of interest
There are no conflicts to declare.
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This study was supported by the National Key Research and
Development Program of China (2016YFA0602900), the National
Natural Science Foundation of China (No. 21425627, 21878344
and 21576302), the Guangdong Technology Research Center for
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