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Two phosphaalkene radical cations 1(•+) and 2(•+) have been reported. 1(•+) is stable in the solid state and has been structurally characterized. 2(•+) only remains persistent in solution. 1(•+) is described as a phosphorus-centered radical, while 2(•+) as a delocalized radical with little contribution from phosphorus.
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Pan et al. (2015) studied this question.
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