{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T15:31:48Z","timestamp":1760369508490,"version":"build-2065373602"},"reference-count":121,"publisher":"Wiley","issue":"36","license":[{"start":{"date-parts":[[2019,5,27]],"date-time":"2019-05-27T00:00:00Z","timestamp":1558915200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100003329","name":"Ministerio de Econom\u00eda y Competitividad","doi-asserted-by":"publisher","award":["CTQ2016-75218-P","CTQ2016-81797-REDC","CTQ2016-77555-C2-1-R","MAT2016-78155-C2-1-R","RYC2012-10491"],"award-info":[{"award-number":["CTQ2016-75218-P","CTQ2016-81797-REDC","CTQ2016-77555-C2-1-R","MAT2016-78155-C2-1-R","RYC2012-10491"]}],"id":[{"id":"10.13039\/501100003329","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100008054","name":"Fundaci\u00f3n Ram\u00f3n Areces","doi-asserted-by":"publisher","award":["CIVP18A3938"],"award-info":[{"award-number":["CIVP18A3938"]}],"id":[{"id":"10.13039\/100008054","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Chemistry A European J"],"published-print":{"date-parts":[[2019,6,26]]},"abstract":"Abstract<\/jats:title>The reactivity of amidinatotetrylenes of the type E(t<\/jats:italic>Bu2<\/jats:sub>bzm)R1<\/jats:sup> (E=Si, Ge; t<\/jats:italic>Bu2<\/jats:sub>bzm=N<\/jats:italic>,N<\/jats:italic>\u2032\u2010bis(tertbutyl)benzamidinate; R1<\/jats:sup>=alkyl or aryl) with the chromium Fischer alkynylcarbene complexes [Cr{C(OEt)C2<\/jats:sub>R2<\/jats:sup>}(CO)5<\/jats:sub>] (R2<\/jats:sup>=Ph; ferrocenyl, Fc) has been studied. At room temperature, two different reaction pathways have been identified: (a)\u2005attack of the amidinatotetrylene to the alkynyl C2<\/jats:sup> atom (\u03b3\u2010attack), which leads to \u03c3\u2010allenyl complexes in which the original Ccarbene<\/jats:sub> atom maintains its attachment to the Cr(CO)5<\/jats:sub> and OEt groups (compounds 3<\/jats:bold>\n), and (b)\u2005attack of the amidinatotetrylene to the Ccarbene<\/jats:sub> atom (\u03b1\u2010attack), which ends in \u03c3\u2010allenyl complexes in which the original Ccarbene<\/jats:sub> atom is not attached to the metal atom and has been inserted into an E\u2212N bond of the amidinatotetrylene forming an E\u2010C\u2010N\u2010C\u2010N five\u2010membered ring (compounds 4<\/jats:bold>\n). It has been found that compounds 3<\/jats:bold>\n are thermodynamically less stable than their corresponding 4<\/jats:bold>\n isomers and that some of the former (E=Ge; R1<\/jats:sup>=CH2<\/jats:sub>SiMe3<\/jats:sub>) can be transformed into the latter upon heating. At high temperatures (>70\u2009\u00b0C) the reactions involving bulky amidinatotetrylenes (R1<\/jats:sup>=Mes, t<\/jats:italic>Bu) end in the carbene\u2010substitution products [Cr{E(t<\/jats:italic>Bu2<\/jats:sub>bzm)R1<\/jats:sup>}(CO)5<\/jats:sub>].<\/jats:p>","DOI":"10.1002\/chem.201901579","type":"journal-article","created":{"date-parts":[[2019,5,2]],"date-time":"2019-05-02T08:57:42Z","timestamp":1556787462000},"page":"8635-8642","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Two Types of \u03c3\u2010Allenyl Complexes from Reactions of Silylenes and Germylenes with Chromium Fischer Alkynyl(alkoxy)carbenes"],"prefix":"10.1002","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8563-9193","authenticated-orcid":false,"given":"Javier A.","family":"Cabeza","sequence":"first","affiliation":[{"name":"Centro de Innovaci\u00f3n en Qu\u00edmica Avanzada (ORFEO-CINQA) Departamento de Qu\u00edmica Org\u00e1nica e Inorg\u00e1nica Universidad de Oviedo 33071 Oviedo Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5024-3874","authenticated-orcid":false,"given":"Pablo","family":"Garc\u00eda\u2010\u00c1lvarez","sequence":"additional","affiliation":[{"name":"Centro de Innovaci\u00f3n en Qu\u00edmica Avanzada (ORFEO-CINQA) Departamento de Qu\u00edmica Org\u00e1nica e Inorg\u00e1nica Universidad de Oviedo 33071 Oviedo Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8961-7685","authenticated-orcid":false,"given":"Mar","family":"G\u00f3mez\u2010Gallego","sequence":"additional","affiliation":[{"name":"Centro de Innovaci\u00f3n en Qu\u00edmica Avanzada (ORFEO-CINQA) Departamento de Qu\u00edmica Org\u00e1nica Universidad Complutense 28040 Madrid 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