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However, the synthesis of such species is a formidable task owing to their intrinsic high reactivity. Herein we report straightforward synthesis, characterization and reactivity studies of a phosphanorcaradiene, in which one of the benzene rings in the flanking fluorenyl substituents is intramolecularly dearomatized through attachment to the phosphorus atom. It is facilely obtained by the reduction of phosphorus(III) dichloride\u00a0precursor with potassium graphite. Despite being thermally robust, it acts as a synthetic equivalent of a transient phosphinidene. It reacts with trimethylphosphine and isonitrile to yield phosphanylidene-phosphorane and 1-phospha-3-azaallene, respectively. When it is treated with one and two molar equivalents of azide, iminophosphane and bis(imino)phosphane are isolated, respectively. Moreover, it is capable of activating ethylene and alkyne to afford [1\u2009+\u20092] cycloaddition products, as well as oxidative cleavage of Si\u2013H and N\u2013H bonds to yield secondary phosphines. All the reactions proceed smoothly at room temperature without the presence of transition metals. The driving force for these reactions is most likely the high ring-constraint of the three-membered PC<jats:sub>2<\/jats:sub> ring and recovery of the aromaticity of the benzene ring.<\/jats:p>","DOI":"10.1038\/s41467-024-49042-1","type":"journal-article","created":{"date-parts":[[2024,5,29]],"date-time":"2024-05-29T17:02:18Z","timestamp":1717002138000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Molecular-strain induced phosphinidene reactivity of a phosphanorcaradiene"],"prefix":"10.1038","volume":"15","author":[{"given":"Yizhen","family":"Chen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peifeng","family":"Su","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dongmin","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9064-8051","authenticated-orcid":false,"given":"Zhuofeng","family":"Ke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6972-2197","authenticated-orcid":false,"given":"Gengwen","family":"Tan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,5,29]]},"reference":[{"key":"49042_CR1","doi-asserted-by":"publisher","first-page":"2377","DOI":"10.1002\/cber.188501802119","volume":"18","author":"E Buchner","year":"1885","unstructured":"Buchner, E. & Curtius, T. 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