“…The [(Ph3P)2Rh(CO)2]+ cation has been reported to form upon reaction of [(Ph3P)2Rh(NO)(CH3CN)2] [PF6]2 with CO at 10 atm pressure, but no characterization data are available. 31 Here, the composition and stereochemistry in 17 are defined by the A2MX2 NMR spectra (A = 13C, M = 103Rh, and X = 31P) of the Relabeled analogue, prepared by exchange of 17 with 13CO. At <-60 °C, the l3C NMR spectrum of 17 in CD2C12 reveals a doublet of triplets centered at 185.4 ppm with JCP = 14.8 Hz and JCRtl = 66 Hz.…”