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- W2016459439 abstract "Substituiert man 3-Acetyl-piperidone-(2) (3) am Stickstoff mit Alkyl-Resten, so findet man durch NMR-spektroskopische Enol-Bestimmung ein deutliches Zunehmen der Enolform mit steigender Kettenlänge (Tabb. 1, 2). Dieser Effekt, der auch an offenkettigen β-Ketoestern 4 und 1.3-Diketonen aufzufinden ist (Tabb. 3–5), wird durch eine Delokalisation der σ-Elektronen in der Paraffinkette erklärt; daraus folgt eine Resonanzbeziehung der am Kettenende des Paraffins überschüssigen σ-Elektronen mit der chelatisierten Enolform, wodurch diese mit steigender Kettenlänge mehr und mehr stabilisiert wird. Effects of Chain Length in Paraffins, VII1). On the Influence of Paraffin Chain Length on the Keto Enol Equilibrium of I-Alkyl-3-acetyl-2-piperidinones and Open Chain β-Dicarbonyl Compounds Substitution of 3-acetyl-2-piperidinones (3) at nitrogen with various alkyl chains results in a clear increase in the enolic form with increasing chain length, as shown by n.m.r. spectroscopic enol determinations (tables 1, 2). This effect, which is also found in open chain β-ketoesters 4 and 1,3-diketones (tables 3–5), can be explained by σ-electron delocalization in the paraffin chain leading to resonance of the excess σ-electrons on the end of the chain with the chelated enolic system, the stabilization increasing with increasing chain length." @default.
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- W2016459439 title "Kettenlängeneffekte in Paraffinen, VII1)Über den Einfluß der Paraffin-Kettenlänge auf das Keto-Enol-Gleichgewicht von 1-Alkyl-3-acetyl-piperidonen-(2) und offenkettigen β-Dicarbonyl-Verbindungen" @default.
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- W2016459439 doi "https://doi.org/10.1002/jlac.19697220103" @default.
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