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Compound <jats:bold>1<\/jats:bold> partially hydrolysed giving [5\u2010<jats:italic>t<\/jats:italic>\u2010Bu\u20101\u2010{(P(O)(O\u2010<jats:italic>i<\/jats:italic>\u2010Pr)<jats:sub>2<\/jats:sub>}\u20103\u2010{(P(O)(OH)<jats:sub>2<\/jats:sub>}C<jats:sub>6<\/jats:sub>H<jats:sub>2<\/jats:sub>]P(O)Ph<jats:sub>2<\/jats:sub> (<jats:bold>4<\/jats:bold>). The reaction of ArLi with PhPCl<jats:sub>2<\/jats:sub> provided the benzoxaphosphaphosphole [1(P), 3(P)\u2010P(O)(O\u2010<jats:italic>i<\/jats:italic>\u2010Pr)OPPh\u20106\u2010<jats:italic>t<\/jats:italic>\u2010Bu\u20104\u2010P(O)(O\u2010<jats:italic>i<\/jats:italic>\u2010Pr)<jats:sub>2<\/jats:sub>]C<jats:sub>6<\/jats:sub>H<jats:sub>2<\/jats:sub>P (<jats:bold>5i<\/jats:bold>) as a mixture of the two diastereomers. The oxidation of <jats:bold>5i<\/jats:bold> with elemental sulfur gave the benzoxaphosphaphosphole sulfide [1(P), 3(P)\u2010P(O)(O\u2010<jats:italic>i<\/jats:italic>\u2010Pr)OP(S)Ph\u20106\u2010<jats:italic>t<\/jats:italic>\u2010Bu\u20104\u2010P(O)(O\u2010<jats:italic>i<\/jats:italic>\u2010Pr)<jats:sub>2<\/jats:sub>]C<jats:sub>6<\/jats:sub>H<jats:sub>2<\/jats:sub> (<jats:bold>5<\/jats:bold>) as pair of enantiomers P1(<jats:italic>R<\/jats:italic>), P3(<jats:italic>S<\/jats:italic>)\/P1(<jats:italic>S<\/jats:italic>), P3(<jats:italic>R<\/jats:italic>) of the diastereomer (<jats:italic>RS\/SR<\/jats:italic>)\u2010<jats:bold>5<\/jats:bold> (<jats:bold>5b<\/jats:bold>). The aryldiphenylphosphane 5\u2010<jats:italic>t<\/jats:italic>\u2010Bu\u20101,3\u2010[(P(O)(O\u2010<jats:italic>i<\/jats:italic>\u2010Pr)<jats:sub>2<\/jats:sub>]<jats:sub>2<\/jats:sub>C<jats:sub>6<\/jats:sub>H<jats:sub>2<\/jats:sub>PPh<jats:sub>2<\/jats:sub> (<jats:bold>6<\/jats:bold>) was obtained from the reaction of the corresponding aryldiphenylphosphane sulfide <jats:bold>2<\/jats:bold> with either sodium hydride, NaH, or disodium iron tetracarbonyl, Na<jats:sub>2<\/jats:sub>Fe(CO)<jats:sub>4<\/jats:sub>. The oxidation of the aryldiphenylphosphane <jats:bold>6<\/jats:bold> with elemental iodine and subsequent hydrolysis yielded the aryldiphenyldioxaphosphorane 9\u2010<jats:italic>t<\/jats:italic>\u2010Bu\u20102,6\u2010(O<jats:italic>H<\/jats:italic>)\u20104,4\u2010Ph<jats:sub>2<\/jats:sub>\u20103,5\u2010O<jats:sub>2<\/jats:sub>\u20102,6\u2010P<jats:sub>2<\/jats:sub>\u20104\u03bb<jats:sup>5<\/jats:sup>\u2010P\u2010[5.3.1.0]\u2010undeca\u20101(10),7(11),8\u2010triene (<jats:bold>7<\/jats:bold>). Both of its diastereomers, (<jats:italic>RR<\/jats:italic>\/<jats:italic>SS<\/jats:italic>)\u2010<jats:bold>7<\/jats:bold> (<jats:bold>7a<\/jats:bold>) and (<jats:italic>RS<\/jats:italic>\/<jats:italic>SR<\/jats:italic>)\u2010<jats:bold>7<\/jats:bold> (<jats:bold>7b<\/jats:bold>), were separated as their chloroform and <jats:italic>i<\/jats:italic>\u2010propanol solvates, <jats:bold>7a<\/jats:bold>\u22c52CHCl<jats:sub>3<\/jats:sub> and <jats:bold>7b<\/jats:bold>\u22c5<jats:italic>i<\/jats:italic>\u2010PrOH, respectively. DFT calculations accompanied the experimental work.<\/jats:p>","DOI":"10.1002\/chem.202201447","type":"journal-article","created":{"date-parts":[[2022,7,12]],"date-time":"2022-07-12T10:24:52Z","timestamp":1657621492000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Chelating Phosphorus\u2013An O, C, O\u2010Coordinating Pincer\u2010Type Ligand Coordinating P<sup>III<\/sup> and P<sup>V<\/sup> Centres"],"prefix":"10.1002","volume":"28","author":[{"given":"Michael","family":"Gock","sequence":"first","affiliation":[{"name":"Technische Universit\u00e4t Dortmund Fakult\u00e4t f\u00fcr Chemie und Chemische Biologie  44221 Dortmund Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Lutter","sequence":"additional","affiliation":[{"name":"Technische Universit\u00e4t Dortmund Fakult\u00e4t f\u00fcr Chemie und Chemische Biologie  44221 Dortmund Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6069-9771","authenticated-orcid":false,"given":"Anna","family":"Pintus","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze Chimiche e Geologiche Universit\u00e0 degli Studi di Cagliari, S.S.\u2005554, Bivio per Sestu  09042 Monserrato (CA) Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dieter","family":"Schollmeier","sequence":"additional","affiliation":[{"name":"Johannes Gutenberg-Universit\u00e4t Mainz Institut f\u00fcr Organische Chemie  Duesbergweg 10\u201314 55099 Mainz Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0058-6406","authenticated-orcid":false,"given":"Massimiliano","family":"Arca","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze Chimiche e Geologiche Universit\u00e0 degli Studi di Cagliari, S.S.\u2005554, Bivio per Sestu  09042 Monserrato (CA) Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8093-576X","authenticated-orcid":false,"given":"Vito","family":"Lippolis","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze Chimiche e Geologiche Universit\u00e0 degli Studi di Cagliari, S.S.\u2005554, Bivio per Sestu  09042 Monserrato (CA) Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9930-858X","authenticated-orcid":false,"given":"Klaus","family":"Jurkschat","sequence":"additional","affiliation":[{"name":"Technische Universit\u00e4t Dortmund Fakult\u00e4t f\u00fcr Chemie und Chemische Biologie  44221 Dortmund Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2022,8,26]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1515\/MGMC.2001.24.4.251"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/om010334c"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/om0305061"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1021\/om050824v"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1021\/om0492247"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/zaac.200900204"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1021\/om970847c"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1099-0682(199905)1999:5<887::AID-EJIC887>3.0.CO;2-2"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1021\/om000452k"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/om0103714"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jorganchem.2005.12.026"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/zaac.200900045"},{"key":"e_1_2_9_13_1","first-page":"637","author":"Henn M.","year":"2011","journal-title":"Z. 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