摘要:
Complexes that show C-C center dot center dot center dot Rh sigma interactions have been synthesized and characterised by NMR spectroscopy and X-ray diffraction: [Rh(PR3)(Binor-S)}[BAr4F], R = (PBu2Me)-Bu-t, PCy(2)Fh; Ar = C6H3(CF3)(2), Binor-S = 1,2,4,5,6,8-dimetheno-S-indacene. These studies, in concert with previously published work, show that there is a rather narrow window of phosphine steric profile that supports the isolation of these interesting complexes, with the phosphine cone angle lying between 160 degrees and 170 degrees. (C) 2012 Elsevier B.V. All rights reserved.