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The formation of the new triphosphaallyl moiety \u03b7<jats:sup>3<\/jats:sup>\u2010P<jats:sub>3<\/jats:sub>{P(O)H} was determined in solution by NMR spectroscopy, and confirmed in the solid state by a single\u2010crystal X\u2010ray structure of the stable product [Ir(\u03ba<jats:sup>2<\/jats:sup>\u2010dppm)(\u03ba<jats:sup>1<\/jats:sup>\u2010dppm)(\u03b7<jats:sup>3<\/jats:sup>\u2010P<jats:sub>3<\/jats:sub>{P(O)H})] (<jats:bold>2<\/jats:bold>). In solution, <jats:bold>2<\/jats:bold> has a fluxional behavior attributable to the four P atoms belonging to the tetraphosphorus moiety in <jats:bold>1<\/jats:bold> and exhibits a chemical exchange process involving the two PPh<jats:sub>2<\/jats:sub> moieties of the same bidentate ligand, as determined by 1D and 2D NMR spectroscopy experiments carried out at variable temperature. The mechanism of the reaction was investigated at the DFT level, which suggested a selective attack of an in\u2010situ generated OH<jats:sup>\u2212<\/jats:sup> anion on one of the non\u2010coordinated phosphorus atoms of the P<jats:sub>4<\/jats:sub> moiety. The reaction then evolves through an acid\u2010assisted tautomerization, which leads to the final compound <jats:bold>2<\/jats:bold>. Bonding analysis pointed out that the new unsubstituted P<jats:sub>3<\/jats:sub>\u2010unit in the \u03b7<jats:sup>3<\/jats:sup>\u2010P<jats:sub>3<\/jats:sub>{P(O)H} moiety behaves as a triphosphallyl ligand.<\/jats:p>","DOI":"10.1002\/asia.201300885","type":"journal-article","created":{"date-parts":[[2013,8,27]],"date-time":"2013-08-27T06:31:10Z","timestamp":1377585070000},"page":"3177-3184","source":"Crossref","is-referenced-by-count":11,"title":["Stabilization of the Triphosphallyl Ligand \u03b7<sup>3<\/sup>\u2010P<sub>3<\/sub>{P(O)H} at Iridium via Alkaline Activation of P<sub>4<\/sub>"],"prefix":"10.1002","volume":"8","author":[{"given":"Vincenzo","family":"Mirabello","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria","family":"Caporali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luca","family":"Gonsalvi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriele","family":"Manca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Ienco","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maurizio","family":"Peruzzini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,8,27]]},"reference":[{"key":"e_1_2_6_1_2","volume-title":"Phosphorus 2000","author":"Corbridge D. 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