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Here we demonstrate production of HCCP in solid argon through the UV\u2010induced rearrangement and subsequent dehydrogenation of phosphapropyne, CH<jats:sub>3<\/jats:sub>CP. Migration of H atoms along the CCP backbone of CH<jats:sub>3<\/jats:sub>CP resulted in production of the previously unobserved species 1\u2010phosphapropadiene, CH<jats:sub>2<\/jats:sub>=C=PH, followed by ethynylphosphine, HCCPH<jats:sub>2<\/jats:sub>.<\/jats:p>","DOI":"10.1002\/anie.202016052","type":"journal-article","created":{"date-parts":[[2020,12,20]],"date-time":"2020-12-20T13:32:15Z","timestamp":1608471135000},"page":"6400-6402","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["An Efficient Photochemical Route Towards Triplet Ethynylphosphinidene, HCCP"],"prefix":"10.1002","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6020-1256","authenticated-orcid":false,"given":"Arun\u2010Libertsen","family":"Lawzer","sequence":"first","affiliation":[{"name":"Institute of Physical Chemistry Polish Academy of Sciences  Kasprzaka 44\/52 01-224 Warsaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2336-4248","authenticated-orcid":false,"given":"Thomas","family":"Custer","sequence":"additional","affiliation":[{"name":"Institute of Physical Chemistry Polish Academy of Sciences  Kasprzaka 44\/52 01-224 Warsaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2929-057X","authenticated-orcid":false,"given":"Jean\u2010Claude","family":"Guillemin","sequence":"additional","affiliation":[{"name":"Univ Rennes Ecole Nationale Sup\u00e9rieure de Chimie de Rennes CNRS, ISCR-UMR 6226  35000 Rennes France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6103-9660","authenticated-orcid":false,"given":"Robert","family":"Ko\u0142os","sequence":"additional","affiliation":[{"name":"Institute of Physical Chemistry Polish Academy of Sciences  Kasprzaka 44\/52 01-224 Warsaw Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,2,11]]},"reference":[{"key":"e_1_2_2_1_1","unstructured":"\u00a0"},{"key":"e_1_2_2_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200905689"},{"key":"e_1_2_2_2_3","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200905689"},{"key":"e_1_2_2_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/ar970055e"},{"key":"e_1_2_2_4_1","doi-asserted-by":"publisher","DOI":"10.1139\/p74-172"},{"key":"e_1_2_2_5_1","first-page":"152","author":"Basco N.","year":"1968","journal-title":"Chem. 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