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The Molecular Ion of 5-Methylene-1,3-cyclohexadiene: Electronic Absorption Spectrum and Revised Enthalpy of Formation

✍ Scribed by Thomas Bally; Dieter Hasselmann; Klaus Loosen

Publisher
John Wiley and Sons
Year
1985
Tongue
German
Weight
597 KB
Volume
68
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The title compound (1) is prepared in situ from 5‐methylenebicyclo[2.2.0]hex‐2‐ene by pyrolysis and subsequent photoionization in a photoelectron spectrometer or by X‐ray irradiation in an Ar matrix where its electronic absorption spectrum is obtained. The results confirm earlier conjectures that the title cation exists as a distinct entity on the C~7~H~8~^+^ hypersurface and can be obtained photochemically from other isomeric ions or by a McLafferty rearrangement. The enthalpies of formation of 1, its precursor and the corresponding radical ions are compared to the most recent data available for other C~7~H~8~ isomers and their ions. It is shown that the thermodynamic stability of 1^+^ is closer to that of toluene cation than concluded on the basis of earlier results.

📜 SIMILAR VOLUMES

Electronic and Molecular Structure of th
Electronic and Molecular Structure of the C8H Valence Isomers 1,3,5-Cyclooctatriene+· and Bicyclo[4.2.0]octa-2,4-diene+· from their Electronic absorption Spectra in Freon
✍ Thomas Bally; Kuno Roth; Rolf Straub 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 German ⚖ 590 KB

According to the observations and data reported by Willstutter and Wuser [4], rather pure COT may have been obtained in their first attempt to synthesize this compound. Note also that independent from Cope and Hochstein [l], Ziegler and Wilms [3b] carefully separated the products obtained by reducti