{"title":"Front Cover: Activation of Allenes by Diferrocenylphosphenium Ion: Isolation of a Wheland Intermediate of Ferrocene (ChemistryEurope 5/2025)","authors":"Corina Stoian, Carolin Exner, Pim Puylaert, Moritz Hornig, Serhiy Demeshko, Malte Fischer, Emanuel Hupf, Jens Beckmann","doi":"10.1002/ceur.70077","DOIUrl":null,"url":null,"abstract":"<p><b>The Front Cover</b> shows a round-bottomed flask containing a burgundy solution of diferrocenylphosphenium ion [Fc<sub>2</sub>P][B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>], which was used in this work to activate various allenes. Dropwise addition to 2-(trimethylsilyl) penta-2,3-diene yields a bright red solution of a stable Wheland intermediate of ferrocene, whose solid-state structure is depicted as a ball-and-stick model. In front lies Saint Peter’s Key, a prominent feature of the City of Bremen’s coat of arms, representing the unlocked potential of highly reactive main group species. More information can be found in the Research Article by E. Hupf, J. Beckmann and co-workers (DOI: 10.1002/ceur.202500031).\n <figure>\n <div><picture>\n <source></source></picture><p></p>\n </div>\n </figure></p>","PeriodicalId":100234,"journal":{"name":"ChemistryEurope","volume":"3 5","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/ceur.70077","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ChemistryEurope","FirstCategoryId":"1085","ListUrlMain":"https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/ceur.70077","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
The Front Cover shows a round-bottomed flask containing a burgundy solution of diferrocenylphosphenium ion [Fc2P][B(C6F5)4], which was used in this work to activate various allenes. Dropwise addition to 2-(trimethylsilyl) penta-2,3-diene yields a bright red solution of a stable Wheland intermediate of ferrocene, whose solid-state structure is depicted as a ball-and-stick model. In front lies Saint Peter’s Key, a prominent feature of the City of Bremen’s coat of arms, representing the unlocked potential of highly reactive main group species. More information can be found in the Research Article by E. Hupf, J. Beckmann and co-workers (DOI: 10.1002/ceur.202500031).
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