The t-butoxycarbonyl radical (ButOĊ![[double bond, length as m-dash]](http://www.rsc.org/images/entities/char_e001.gif)
O), produced by photolysis of di-t-butyl peroxide in the presence of t-butyl formate, has been observed by e.s.r. spectroscopy and shown to be a σ-radical; the kinetics of the decarboxylation of ButOĊO have been measured and the reaction shown to have a low A-factor (1010·8s–1) for a unimolecular scission.
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