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• W2064938051 abstract "The 1H NMR spectra of [(amino-14N)methylcarbene]-(natural isotope composition) position) and [(amino-15N)methylcarbene]-(95% enriched)-pentacarbonylchromium(0), as well as of RR′N-(CH3)C:→Cr(CO)5 (R = CH3, R′ = H; R = CH3, R′ = CH3; R = tert-C4H9, R′ = H; R = p-CH3OC6H4, R′ = H; R = p-CF3C6H4, R′ = H) are discussed. A high barrier to rotation and the observation of “homoallylic couplings” imply a double bond character of the central CN bond which is higher than in amides of carboxylic acids. The NMR-spectroscopic results lead to the conclusion that the singly substituted aminomethylcarbene complexes exist predominantly in the cis-form. In the case of the N-methyl compound this result is consistent with the X-ray analysis. Die 1H-NMR-Spektren on [(Amino-14N)methylcarben]- (natürliche Isotopenzusammensetzung) und [(Amino-15N)methylcarben]-(95%ige Anreicherung)-pentacarbonylchrom(0), ferner von RR′N-(CH3)C:→Cr(CO)5 (R = CH3, R′ = H; R = CH3, R′ = CH3; R = tert-C4H9, R′ = H; R = p-CH3OC6H4, R′ = H; R = p-CF3C6H4, R′ = H) werden diskutiert. Eine hohe Rotationsbarriere und die Beobachtung von “Homoallylkopplungen” machen einen gegenüber Carbonsäureamiden erhöhten Doppelbindungscharakter der zentralen CN-Bindung wahrscheinlich. Die NMR-spektroskopischen Befunde führen zu dem Schluβ, daβ die einfach substituierten Aminomethylcarben-Komplexe vorzugsweise in der cis-Form vorliegen. Im Falle der N-Methylverbindung ist dieses Ergebnis mit der Röntgenstrukturanalyse in Einklang." @default.
• W2064938051 created "2016-06-24" @default.
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• W2064938051 date "1968-08-01" @default.
• W2064938051 modified "2023-09-26" @default.
• W2064938051 title "Übergangsmetall-carben-komplexe VIII. 1H-NMR-spektroskopische untersuchungen an (amino-methylcarben)pentacarbonylchrom(0)-komplexen" @default.
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• W2064938051 doi "https://doi.org/10.1016/s0022-328x(00)82768-0" @default.
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