Direct pulse radiolysis evidence, complemented by e.s.r. experiments, establishes that the radical cation Me2C–ĊMe2(λmax.ca. 290 nm) is formed by acid-catalysed elimination of OH– from ·CMe2CMe2OH; the radical cation deprotonates to give ·CH2CMe![[double bond, length half m-dash]](http://www.rsc.org/images/entities/char_e006.gif)
CMe2 with k 3.9 × 105 s–1.
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