The decarboxylation of tert-butyl-9-methylfluorene-9-percarboxylate is investigated by picosecond UV pump/ IR probe spectroscopy. An intense 308 nm UV pulse of 1 ps duration is used for excitation. The formation of CO 2 is monitored on a picosecond time scale via the absorption of the asymmetric stretch at 2335 cm -1 . The mode of bond scission, concerted or stepwise, is discussed.
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