{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,19]],"date-time":"2026-09-19T01:17:23Z","timestamp":1789780643644,"version":"4.0.1"},"reference-count":74,"publisher":"Wiley","issue":"25","license":[{"start":{"date-parts":[[2017,5,17]],"date-time":"2017-05-17T00:00:00Z","timestamp":1494979200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["Sche 384\/32-1"],"award-info":[{"award-number":["Sche 384\/32-1"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Angew Chem Int Ed"],"published-print":{"date-parts":[[2017,6,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The versatile coordination behavior of the P<jats:sub>4<\/jats:sub> butterfly complex [{Cp\u2032\u2032\u2032Fe(CO)<jats:sub>2<\/jats:sub>}<jats:sub>2<\/jats:sub>(\u03bc,\u03b7<jats:sup>1:1<\/jats:sup>\u2010P<jats:sub>4<\/jats:sub>)] (<jats:bold>1<\/jats:bold>, Cp\u2032\u2032\u2032=\u03b7<jats:sup>5<\/jats:sup>\u2010C<jats:sub>5<\/jats:sub>H<jats:sub>2<\/jats:sub><jats:sup>t<\/jats:sup>Bu<jats:sub>3<\/jats:sub>) towards different iron(II) compounds is presented. The reaction of <jats:bold>1<\/jats:bold> with [FeBr<jats:sub>2<\/jats:sub>\u22c5dme] (dme=dimethoxyethane) leads to the chelate complex [{Cp\u2032\u2032\u2032Fe(CO)<jats:sub>2<\/jats:sub>}<jats:sub>2<\/jats:sub>(\u03bc<jats:sub>3<\/jats:sub>,\u03b7<jats:sup>1:1:2<\/jats:sup>\u2010P<jats:sub>4<\/jats:sub>){FeBr<jats:sub>2<\/jats:sub>}] (<jats:bold>2<\/jats:bold>), whereas, in the reaction with [Fe(CH<jats:sub>3<\/jats:sub>CN)<jats:sub>6<\/jats:sub>][PF<jats:sub>6<\/jats:sub>]<jats:sub>2<\/jats:sub>, an unprecedented rearrangement of the P<jats:sub>4<\/jats:sub> butterfly structural motif leads to the cyclo\u2010P<jats:sub>4<\/jats:sub> moiety in {(Cp\u2032\u2032\u2032Fe(CO)<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub>(\u03bc<jats:sub>3<\/jats:sub>,\u03b7<jats:sup>1:1:4<\/jats:sup>\u2010P<jats:sub>4<\/jats:sub>)}<jats:sub>2<\/jats:sub>Fe][PF<jats:sub>6<\/jats:sub>]<jats:sub>2<\/jats:sub> (<jats:bold>3<\/jats:bold>). Complex <jats:bold>3<\/jats:bold> represents the first fully characterized \u201ccarbon\u2010free\u201d sandwich complex containing cyclo\u2010P<jats:sub>4<\/jats:sub>R<jats:sub>2<\/jats:sub> ligands in a homoleptic\u2010like iron\u2013phosphorus\u2010containing molecule. Alternatively, <jats:bold>2<\/jats:bold> can be transformed into <jats:bold>3<\/jats:bold> by halogen abstraction and subsequent coordination of <jats:bold>1<\/jats:bold>. The additional isolated side products, [{Cp\u2032\u2032\u2032Fe(CO)<jats:sub>2<\/jats:sub>}<jats:sub>2<\/jats:sub>(\u03bc<jats:sub>3<\/jats:sub>,\u03b7<jats:sup>1:1:2<\/jats:sup>\u2010P<jats:sub>4<\/jats:sub>){Cp\u2032\u2032\u2032Fe(CO)}][PF<jats:sub>6<\/jats:sub>] (<jats:bold>4<\/jats:bold>) and [{Cp\u2032\u2032\u2032Fe(CO)<jats:sub>2<\/jats:sub>}<jats:sub>2<\/jats:sub>(\u03bc<jats:sub>3<\/jats:sub>,\u03b7<jats:sup>1:1:4<\/jats:sup>\u2010P<jats:sub>4<\/jats:sub>){Cp\u2032\u2032\u2032Fe}][PF<jats:sub>6<\/jats:sub>] (<jats:bold>5<\/jats:bold>), give insight into the stepwise activation of the P<jats:sub>4<\/jats:sub> butterfly moiety in <jats:bold>1<\/jats:bold>.<\/jats:p>","DOI":"10.1002\/anie.201703175","type":"journal-article","created":{"date-parts":[[2017,5,17]],"date-time":"2017-05-17T09:19:27Z","timestamp":1495012767000},"page":"7312-7317","source":"Crossref","is-referenced-by-count":23,"title":["Rearrangement of a P<sub>4<\/sub> Butterfly Complex\u2014The Formation of a Homoleptic Phosphorus\u2013Iron Sandwich Complex"],"prefix":"10.1002","volume":"56","author":[{"given":"Julian","family":"M\u00fcller","sequence":"first","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie der Universit\u00e4t Regensburg  93040 Regensburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sebastian","family":"Heinl","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie der Universit\u00e4t Regensburg  93040 Regensburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"Schwarzmaier","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie der Universit\u00e4t Regensburg  93040 Regensburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G\u00e1bor","family":"Bal\u00e1zs","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie der Universit\u00e4t Regensburg  93040 Regensburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Keilwerth","sequence":"additional","affiliation":[{"name":"Department Chemie und Pharmazie, Institut f\u00fcr Anorganische Chemie Friedrich-Alexander University Erlangen-N\u00fcrnberg, FAU  Egerlandstrasse 1 91058 Erlangen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karsten","family":"Meyer","sequence":"additional","affiliation":[{"name":"Department Chemie und Pharmazie, Institut f\u00fcr Anorganische Chemie Friedrich-Alexander University Erlangen-N\u00fcrnberg, FAU  Egerlandstrasse 1 91058 Erlangen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2182-5020","authenticated-orcid":false,"given":"Manfred","family":"Scheer","sequence":"additional","affiliation":[{"name":"Institut f\u00fcr Anorganische Chemie der Universit\u00e4t Regensburg  93040 Regensburg 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lone pairs of the two \u201cwing-tip\u201d P atoms of the butterfly complex and the two electrons of the subsequently opened \u201cbridgehead\u201d P\u2212P bond results in the 6\u2009\u03c0-electrons of the aromatic P4R2system."},{"key":"e_1_2_2_55_1","doi-asserted-by":"publisher","DOI":"10.1021\/ed085p532"},{"key":"e_1_2_2_56_1","unstructured":"For details cf. 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