Electronic and Molecular Structure of the C<sub>8</sub>H 10+· Valence Isomers 1,3,5-Cyclooctatriene<sup>+·</sup>and Bicyclo[4.2.0]octa-2,4-diene<sup>+·</sup>from their Electronic absorption Spectra in<i>Freon</i>
作者:Thomas Bally、Kuno Roth、Rolf Straub
DOI:10.1002/hlca.19890720110
日期:1989.2.1
The molecular cations of 1,3,5-cyclooctatriene (COT+·) and bicyclo[4.2.0]octa-2,4-diene (BCO+·) can be observed intact in γ-irradiated Freon glasses, as opposed to Ar matrices where ionization is accompanied by extensive rearrangements. This proves the superiority of the Freon-glass method for the generation of metastable primary cations. The electronicabsorption (EA) spectra reveal a) that a previous
Intramolekulare [2+2]-cycloadditionen von γ-oxoketenen
作者:Joachim Hegmann、Manfred Christl、Karl Peters、Eva-Maria Peters、Hans Georg von Schnering
DOI:10.1016/s0040-4039(00)96879-5
日期:1987.1
The γ-oxoketenes, which are accessible from methyl 1,3,4-oxadiazin-6-one-2-carboxylate-1 and cycloalkenes, are shown to undergo an intramolecular [2+2] cycloaddition either on heating or on photolysis to give different stereoisomers of β-lactones of the 3-oxo-2-oxabicyclo[2.2.0]hexane-type.