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M. Coquerel, D. Filippini, J. Bensa, C. Rodriguez, . J. Eur et al., 10 (a) With b-ketosulfones: (b) For the reversibility issue, see also: (b) For other applications from our laboratory, see: (c), see: C. Burstein, S. Tschan, X. Xie and F. Glorius, pp.4298-4309, 1092.

D. W. Lelais, A. Macmillan, E. M. Acta, J. A. Higgins, A. G. Sherwood et al., Synthesis, 2015, 3451. 15 The triazolylidene catalyst employed in ref. 10 is ca 10 6 times less basic than the NHC catalyst II. (a) 16 For switchable monocatalytic transformations with NHCs, see: (a), Fleige, D. Janssen-Müller, C. G. Daniliuc and F. Glorius, pp.39-79, 1559.