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The stability of the phosphaallenes depends on steric shielding by the substituents at phosphorus (aryl or CH(SiMe<jats:sub>3<\/jats:sub>)<jats:sub>2<\/jats:sub> groups). Only supermesityl compounds are persistent at room temperature in solution. This simple method starting with easily accessible dialkynylphosphines and commercially available aluminium hydrides (HAlEt<jats:sub>2<\/jats:sub>, HAl<jats:italic>i<\/jats:italic>Bu<jats:sub>2<\/jats:sub>) allows the generation of transient species, which were trapped by coordination to transition metals. The \u03b7<jats:sup>1<\/jats:sup>\u2010coordination via a P\u2212W bond was observed for tungsten, while the side\u2010on coordination via the P=C bond resulted with platinum. Decomposition of the mesityl derivative yielded an unprecedented product, which may be formed by 1,3\u2010H shift to the P atom, hydrophosphination of the P=C bond of a second phosphaallene and formation of a P\u2212P bond.<\/jats:p>","DOI":"10.1002\/chem.201806334","type":"journal-article","created":{"date-parts":[[2019,1,25]],"date-time":"2019-01-25T05:25:29Z","timestamp":1548393929000},"page":"4793-4807","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["3H\u2010Phosphaallenes Revisited: Facile Synthesis by Hydroalumination of Alkynylphosphines and \u03b2\u2010Elimination, Stability and Trapping of Transient Species by Coordination to Transition Metal Atoms"],"prefix":"10.1002","volume":"25","author":[{"given":"Hans","family":"Kl\u00f6cker","sequence":"first","affiliation":[{"name":"Institut f\u00fcr Anorganische und Analytische Chemie Westf\u00e4lische Wilhelms-Universit\u00e4t M\u00fcnster  Corrensstrasse 30 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