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The First Magic Angle Spinning NMR Spectrum of a Captive Intermediate: Direct Observation of a Singlet Ground State Biradical, 3,4-Dimethylenefuran. Zilm, K. W.; Merrill, R. A.; Greenberg, M. M.; Berson, J. A. J. Am. Chem. Soc. 1987, 109, 1567.
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