Fig. 2 | Nature Communications

Fig. 2

From: Mechanism of copper-free Sonogashira reaction operates through palladium-palladium transmetallation

Fig. 2

Model reactions and conditions with the proposed phosphorous containing species. a, b Reaction conditions (a) and product 3 build-up as determined by 1H NMR spectroscopy (b). c 31P NMR spectra of aliquots from Reaction a (with 20 mol% of Pd-cat.), after 1 and 4 h. d 31P NMR spectra of aliquots from Reaction b (with 20 mol% of Pd-cat.), after 1 and 4 h. Relative intensities of the resonances do not correspond to the concentrations of the species. For spectra showing more frequent sampling, see Supplementary Figs. 18

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