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J. S. Miller, J. C. Calabrese, A. J. Epstein, R. W. Bigelow, J. H. Zhang and W. M. Reiff, J. Chem. Soc., Chem. Commun., 1986, 1026 DOI: 10.1039/C39860001026
Miller et al. (Wed,) studied this question.