... 4, image file: c3ra46803h-u16.tif, image file: c3ra46803h-u17.tif, 55. ... (a) RF Hunter, J. Chem. Soc., 1930, 125 RSC ; (b) M. Claasz, Chem. ... For recent studies on copper-catalyzed C–S bond formation, see: (a) F. Ke, Y. Qu, Z. Jiang, Z. Li, D. Wu and X. Zhou, Org. ...