Zintl ions are being explored for small molecule activation reactions. The protonated Gr...

Zintl ions are being explored for small molecule activation reactions. The protonated Group 15 Zintl ion, [HP₇]^2- effects hydrophosphination of carbodiimides, (R = 2,6-diisopropylphenyl, ⁱPr, Cy) to afford amidinefunctionalized Zintl ions [P₇C(NHR)(NR)]^2- (R. S. P. Turbervill, J. M. Goicoechea, Chem. Commun. 2012, 48, 1470; R. S. P. Turbervill, J. M. Goicoechea, Organometallics, 2012, 31, 2452). Provide two observations that support the hypothesis that the protonation step is an intramolecular process. Draw the Lewis structure of [HP₇]^2- that indicates the negatively charged phosphorus atoms, and then use the arrow-pushing formalism to describe the proposed hydrophosphination mechanism for a general