{"title":"Direct access to a neutral alumene via CO reduction by a dialane and further CO homologation","authors":"John A. Kelly, Arseni Kostenko, Shigeyoshi Inoue","doi":"10.1038/s44160-025-00874-9","DOIUrl":null,"url":null,"abstract":"<p>Multiple bonds between heavy elements have been shown to be not only stable but also offer divergent reactivity. Accordingly, there has been a drive in research to isolate such species. Here we report on the synthesis of a compound containing an aluminium–carbon double bond (alumene). The alumene was formed by exposing a dialane to a CO atmosphere. Experimental data and quantum chemical calculations confirm the existence of a <i>π</i>-bond between the aluminium and carbon centre. The mechanism for the formation of the alumene was calculated and indicated a heterocyclic intermediate, which we were able to observe spectroscopically. Treating the alumene with excess CO leads to CO homologation, forming a C<sub>3</sub>O<sub>2</sub> chain initiated by interaction of a CO molecule with the <i>π</i>-bond of Al=C.</p><figure></figure>","PeriodicalId":74251,"journal":{"name":"Nature synthesis","volume":"9 1","pages":""},"PeriodicalIF":20.0000,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nature synthesis","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1038/s44160-025-00874-9","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
Multiple bonds between heavy elements have been shown to be not only stable but also offer divergent reactivity. Accordingly, there has been a drive in research to isolate such species. Here we report on the synthesis of a compound containing an aluminium–carbon double bond (alumene). The alumene was formed by exposing a dialane to a CO atmosphere. Experimental data and quantum chemical calculations confirm the existence of a π-bond between the aluminium and carbon centre. The mechanism for the formation of the alumene was calculated and indicated a heterocyclic intermediate, which we were able to observe spectroscopically. Treating the alumene with excess CO leads to CO homologation, forming a C3O2 chain initiated by interaction of a CO molecule with the π-bond of Al=C.
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