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- W2045069166 abstract "Die Dimerisierung von Alkyl(phenyl)ketenen 1 und Alkyl(benzyl)ketenen 4 führt entsprechend der Reihenfolge Methyl, Ethyl, Benzyl, Isopropyl für Alkyl zu zunehmender [bei Isopropyl(phenyl)keten 1c ausschließlicher] Bildung der cis-Dimeren. Diese erklärt sich zwanglos aus der günstigen Annäherung der Komponenten zu einem [π 2S + π 2a]-Prozeß.-Die Isomerenzuordnung erfolgte auf Grund von 1H-NMR- und 13C-NMR-Spektren sowie von zwei Röntgenstrukturanalysen. Stereochemistry of Dimerization of Unsymmetrically Substituted Ketoketenes Dimerization of alkyl(phenyl)ketenes (1) and alkyl(benzyl)ketenes (4) gives increasing proportions of cis-dimers along the series methyl, ethyl, benzyl, isopropyl, exclusive cis-dimer formation occurring in the case of isopropyl(phenyl)ketene 1c. This readily explained in terms of the easiest approach of the components towards a [π2S + π2a] process. The geometries were assigned on the basis of 1H-NMR, 13C-NMR, and in two cases by X-ray analysis." @default.
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- W2045069166 date "1979-04-25" @default.
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- W2045069166 title "Stereochemie der Dimerisierung von unsymmetrisch substituierten Ketoketenen" @default.
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- W2045069166 doi "https://doi.org/10.1002/jlac.197919790418" @default.
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