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Abstract
The interaction of nitroxide radicals with the Lewis acids, aluminum chloride and boron trifluoride has been investigated using e.s.r. and n.m.r. techniques. Three types of reaction have been demonstrated. Initially a paramagnetic complex with the nitroxide group is formed. This can then dimerize or polymerize to a diamagnetic complex. Concurrently rearrangement of t-butyl groups to s-butyl groups can occur giving a further series of radicals and complexes. The rearrangements are analogous to the well known carbonium ion rearrangements induced by Lewis acid catalysts. Relative equilibrium constants and rates for the various reactions are discussed in a qualitative manner.
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