The direct assembly of metalloporphyrin and Mg–Al layered double hydroxides nanosheets: a highly efficient catalyst for the green epoxidation of olefins

Room-temperature tandem conversion of cyclic alkenes into 1,2-diols using molecular oxygen and β-MnO2heterogeneous catalyst

“…16 It has been reported that the addition of aldehyde as an additive could effectively assist transition metal catalysts to activate oxygen molecules to form reactive radicals, transferring oxygen atoms into cyclic alkene molecules and generating the corresponding epoxide. [17][18][19][20] Moreover, cyclic alkene could almost be transformed into epoxide totally. However, the added aldehyde will be converted to carboxylic acid as a by-product (see Reaction 1 shown in Scheme 1).…”