A sustainable and
practical protocol to prepare epoxides has been
established by using air as the oxidant in the presence of K2CO3 in isopropylbenzene (CM) at 80–140 °C.
The olefins are successfully converted into their corresponding epoxides
in yields of up to 99%. CM and K2CO3 are reused
in the scale-up recycling experiments. A reaction mechanism dominated
by the radical pathway is proposed according to the control experiments
and kinetic analysis.
The oxidative cleavage of C=C bonds is an important chemical reaction, which is a popular reaction in the photocatalytic field. However, high catalyst-loading and low turnover number (TON) are general shortcomings in reported visible-light-driven reactions. Herein, the direct oxidative cleavage of C=C bonds through water-soluble CdSe quantum dots (QDs) is described under visible-light irradiation at room temperature with high TON (up to 3.7 × 10 4 ). Under the same conditions, water-soluble CdSe QDs could also oxidize sulfides to sulfoxides with 51-84 % yields and TONs up to 3.4 × 10 4 . The key features of this photocatalytic protocol include high TONs, wide substrates scope, low catalyst loadings, simple and mild reaction conditions, and molecular O 2 as the oxidant.
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