The difference in reaction rates for compounds 1 and 2 is probably due to the variation in the Au-P bond energies. It is also significant that |/( 031 )| appears to be greater for compound 2 than for compound 1, confirming a stronger Au-P interaction in the former. Finally, in ir spectra reported by Coates, et al.f the Au-P stretching frequencies show a higher value for Aum than for Au1 compounds. According to molecular models, steric factors are not likely to play a decisive role.(8) C. H. Langford and . B. Gray, "Ligand Substitution Processes,"

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