(C5Me5)3Sm reacts with the free radical 2,2,6,6-tetramethylpiperidinyl-1-oxy (TMPO) to form (C5Me5)2 and the per nitroxide [(eta 1-ONC5H6Me4)2Sm(mu-eta 1:eta 2-ONC5H6Me4)]2.
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Evans et al. (2001) studied this question.
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