Protonation of metal carbonyl complexes : VII. Proton NMR spectra and stereochemistry of protonated forms of π-cyclopentadienylphosphinemanganese complexes

¹H NMR measurements show that protonation of the complexes π-C₅H₅Mn-CO)_3-n(PR₃)n (n = 1 and 2) with CF₃COOH occurs at the manganese atom, the spectra revealing “hydride” signal at δ values of -4 to -6 ppm. The stereochemistry of the protonated forms has been determined from the ¹H  ³¹P couling pattern.