into an oil batch preset to the reaction temperature. After
heating for 20 min, CO2 was introduced into the reactor with
a high-pressure liquid pump (Jasco SCF-Get) to the desired
pressure. The reaction was conducted while the mixture was
stirred vigorously with a magnetic stirrer. After the reaction,
the reactor was cooled to room temperature with an ice-water
bath and then depressurized carefully. The products were washed
with deionized (DI) water, recovered by filtration or rotary
evaporation (depending on the solubility of product in water)
and then dried in vacuum thoroughly. The powders were weighed
to determine the isolated yields. All the samples were analyzed
by gas chromatograph (Shimadzu GC-2010, Rtx-50 capillary
column). The products were characterized by GC-MS (Agilent
5975/6890N). The solid-state 13C CP/MAS NMR spectra were
obtained on a Bruker Avance 400 WB spectrometer.
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This work was financially supported by the One Hundred Talent
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