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Oxygen diene geometry

The same mixture of H and I was obtained starting with either of the geometrically isomeric radical precursors E or F. A possible explanation is based on the assumption of a common radical conformer G, stabilized in the geometry shown by electron delocalization involving the radicaloid p-orbital, the p-peroxy oxygen and Jt of the diene unit. The structure of the compounds H and I were determined by H NMR spectra and the conversion of H to diol J, a known intermediate for the synthesis of prostaglandins. [Pg.298]

Seven-membered ring trani-alkenes have been accessed diastereoselectively from dienes and aldehydes by the silver-catalysed transfer of silylene (Scheme 13). The trans geometry of the double bond has been assigned from cleavage of the silicon-oxygen bond (path (a)). The high strain of these cyclic trawi-alkenes can... [Pg.203]


See other pages where Oxygen diene geometry is mentioned: [Pg.320]    [Pg.320]    [Pg.157]    [Pg.457]    [Pg.98]    [Pg.154]    [Pg.262]    [Pg.930]    [Pg.262]    [Pg.621]    [Pg.451]    [Pg.451]    [Pg.351]    [Pg.590]    [Pg.432]    [Pg.537]    [Pg.943]    [Pg.451]    [Pg.457]    [Pg.214]    [Pg.283]    [Pg.536]    [Pg.576]    [Pg.831]    [Pg.5494]    [Pg.127]    [Pg.267]    [Pg.247]    [Pg.272]    [Pg.210]    [Pg.102]   
See also in sourсe #XX -- [ Pg.198 ]




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Diene oxygenation

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