KOPS - Das Institutionelle Repositorium der Universität Konstanz

Modification of aminoallenylidene complexes of chromium via exchange of the C3-bound amino group

Modification of aminoallenylidene complexes of chromium via exchange of the C3-bound amino group

Zitieren

Dateien zu dieser Ressource

Dateien Größe Format Anzeige

Zu diesem Dokument gibt es keine Dateien.

SZESNI, Normen, Bernhard WEIBERT, Helmut FISCHER, 2005. Modification of aminoallenylidene complexes of chromium via exchange of the C3-bound amino group. In: Inorganica Chimica Acta. 358(5), pp. 1645-1656. ISSN 0020-1693. eISSN 1873-3255. Available under: doi: 10.1016/j.ica.2004.12.006

@article{Szesni2005Modif-22924, title={Modification of aminoallenylidene complexes of chromium via exchange of the C3-bound amino group}, year={2005}, doi={10.1016/j.ica.2004.12.006}, number={5}, volume={358}, issn={0020-1693}, journal={Inorganica Chimica Acta}, pages={1645--1656}, author={Szesni, Normen and Weibert, Bernhard and Fischer, Helmut} }

<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/22924"> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dc:creator>Fischer, Helmut</dc:creator> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-06-05T07:39:43Z</dcterms:available> <dcterms:issued>2005</dcterms:issued> <dc:language>eng</dc:language> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103605204-4002607-1"/> <dc:creator>Szesni, Normen</dc:creator> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-06-05T07:39:43Z</dc:date> <dc:rights>deposit-license</dc:rights> <dcterms:abstract xml:lang="eng">The aminoallenylidene(pentacarbonyl)chromium complexes [(CO)5Crdouble bond; length as m-dashCdouble bond; length as m-dashCdouble bond; length as m-dashC(NR1R2)Ph] (1a–c) react with dimethylamine by addition of the amine to the C1double bond; length as m-dashC2 bond of the allenylidene ligand to give alkenyl(amino)carbene complexes [(CO)5Crdouble bond; length as m-dashC(NMe2)CHdouble bond; length as m-dashC(NR1R2)Ph] (2a–c) (R1 = Me: R2 = Me (a), Ph (b); R1 = Et: R2 = Ph (c)). In contrast, addition of a large excess (usually 20 equivalents) of ammonia or primary amines, H2NR, to solutions of [(CO)5Crdouble bond; length as m-dashCdouble bond; length as m-dashCdouble bond; length as m-dashC(NMe2)Ph] (1a) affords the aminoallenylidene complexes [(CO)5Crdouble bond; length as m-dashCdouble bond; length as m-dashCdouble bond; length as m-dashC(NHR)Ph] (1d–w) in which the dimethylamino group is replaced by NH2 or NHR, respectively. In addition to simple amines such as methylamine, butylamine, and aniline, amines carrying a functional group (allylamine, propargylamine) and amino acid esters as well as amino terpenes and amino sugars can be used to displace the NMe2 substituent. Usually the Z isomer (with respect to the partial C3–N double bond) is formed exclusively. Products derived from addition of H2NR to the C1double bond; length as m-dashC2 bond of 1a are not observed. The amino group in 1d–w is rapidly deprotonated by excess of amine to form iminium alkynyl chromates [1d–w]−, thus protecting 1d–w from addition of free amine to either C3 or across the C1double bond; length as m-dashC2 bond. The iminium alkynyl chromates are readily reprotonated by acids or by chromatography on wet SiO2 to reform 1d–w.</dcterms:abstract> <dc:creator>Weibert, Bernhard</dc:creator> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/29"/> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/22924"/> <dc:contributor>Weibert, Bernhard</dc:contributor> <dcterms:title>Modification of aminoallenylidene complexes of chromium via exchange of the C3-bound amino group</dcterms:title> <dcterms:bibliographicCitation>Inorganica Chimica Acta ; 358 (2005), 5. - S. 1645-1656</dcterms:bibliographicCitation> <dc:contributor>Szesni, Normen</dc:contributor> <dc:contributor>Fischer, Helmut</dc:contributor> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/29"/> </rdf:Description> </rdf:RDF>

Das Dokument erscheint in:

KOPS Suche


Stöbern

Mein Benutzerkonto