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  • 1
    ISSN: 0009-2940
    Keywords: CH Acidity ; Rhenium complexes ; Allylidene ; Butatriene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: α-CH Acidity of Allylidene Complexes: Organorhenium Derivatives of 1,2,3-Butatriene by Dehydrochlorination of Rhena(V) Allylidenes. Synthesis and StructureThe rhena(V) allylidene complex (η5-C5Me5)ReCl2 [η1:η3-(CH3)-CC(Cl)CH2] (2) is quantitatively converted into the novel organorhenium 1,2,3-butatriene derivative (η5-C5Me5)ReCl2[η3-H2CC(C5H5N)CCH2] (3) by lithium hydroxide in the presence of excess pyridine. This result shows so far not investigated CH acidity of methyl groups, that are substituting π-bonded allylidene frameworks at the α-position. According to an X-ray structure analysis, the coordination geometry of the 1,2,3-butatriene ligand is very similar to related allyl complexes of the (η5-C5Me5)ReCl2 fragment.
    Notes: Der Rhena(V)-allyliden-Komplex (η5-C5Me5)ReCl2 [η1:η3-(CH3)-CC(Cl)CH2] (2) wird durch Lithiumhydroxid in Gegenwart von überschüssigem Pyridin quantitativ zu dem neuartigen rhenium-organischen 1,2,3-Butatrien-Derivat (η5-C5Me5)ReCl2[η3-H2CC(C5H5N)CCH2] (3) dehydrohalogeniert. Dieses Ergebnis weist auf die bisher nicht beachtete CH-Acidität von Methylgruppen hin, die ein π-gebundenes Allyliden-Gerüst α-ständig substituieren. Einer Röntgenstrukturanalyse zufolge ist der von 1,2,3-Butatrien abgeleitete Ligand allylartig an das (η5-C5Me5)ReCl2-Fragment gebunden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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