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UV/Vis absorption spectra of 1 a during the CO2 fixation reaction of propylene oxide to 4‐methyl‐1,3‐dioxolan‐2‐one. Solid black line: 1 a in propylene oxide at 20 °C; dotted green line: after addition of propylene oxide, TBAB and CO2 bubbling; dashed red line: after full conversion of propylene oxide to cyclic carbonate 3.
