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Well\u2010defined phosphorus\u2010centered reactivity towards nucleophiles and electrophiles is reported, contrasting with prior reports on this class of compounds. Reactions towards oxidants are also described. The latter result in the two\u2010electron oxidation of the phosphorus atom from +III to +V and are accompanied by a strong geometric distortion of the NNN pincer ligand. By contrast, cooperative activation of E\u2212H (HCl, HBcat, HOMe) bonds proceeds with retention of the phosphorus redox state. When using H<jats:sub>2<\/jats:sub>O as a substrate, the reaction results in the full disassembly of H<jats:sub>2<\/jats:sub>O to its constituent atoms, highlighting the potential of this platform for small molecule activation reactions.<\/jats:p>","DOI":"10.1002\/chem.202300818","type":"journal-article","created":{"date-parts":[[2023,4,12]],"date-time":"2023-04-12T09:24:45Z","timestamp":1681291485000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Reactivity of a Strictly T\u2010Shaped Phosphine Ligated by an Acridane Derived NNN Pincer Ligand"],"prefix":"10.1002","volume":"29","author":[{"given":"Aaron J.","family":"King","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Oxford Chemistry Research Laboratory  12 Mansfield Road Oxford OX1 3TA UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8787-6253","authenticated-orcid":false,"given":"Josh","family":"Abbenseth","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Oxford Chemistry Research Laboratory  12 Mansfield Road Oxford OX1 3TA UK"},{"name":"Institut f\u00fcr Chemie Humboldt-Universit\u00e4t zu Berlin  Brook-Taylor-Stra\u00dfe 2 12489 Berlin Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7311-1663","authenticated-orcid":false,"given":"Jose M.","family":"Goicoechea","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indiana University  800 E. 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