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Note
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The arguments put forward in the previous paragraphs suggest that the neighboring group effect should favor activation at the 2-position if phosphine-assisted pathways prevail over oxidative addition. Why, then, do we observe activation at the 4- rather than 2-position for the corresponding reactions with platinum, where both computational and experimental evidence confirms a prominent role for metallophosphoranes- The transition-state structure for activation at the 2-position does indeed show evidence for neighboring group participation by nitrogen, albeit not as conspicuous as in the nickel analogue (Pt?N = 2.35 Å, Ni?N 1.98 Å), probably because the greater stability of the Pt(II) oxidation state reduces the need for donation of electron density from the pyridyl ligand. Moreover, the Pt?C bonds (which are fully formed at the transition state) are very strong, and this favors activation in the 4-position. Thus the rather weak neighboring group effect in the platinum system is unable to overcome the intrinsic preference for activation at the 4-position dictated by the M?C bond strength.
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