Metal- and halide-free catalyst DABCO·HSac, i.e. the binary adduct of 1,4-diazabicyclo[2.2.2]octane (DABCO) and saccharin (HSac), in an ionic pair structure of DABCO-H⁺·Sac⁻ is shown mild and efficient in promoting the cycloaddition of CO 2 into epoxides (CCE) reactions. Under...

Cycloaddition of CO2 into epoxides (CCE) reaction was the few chemical processes viable commercially in valorizations of carbon dioxide. The produced cyclic carbonate was valuable in electrolyte of lithium batteries and so on, however, halide anion was monopoly as cocatalyst in catalytic CCE...