Electronic States of Phenylene and Naphthylene Bicyclobutanes. Linear Dichroism in Stretched Polyethylene

Spanget‐Larsen, Jens; Gubernator, K.; Gleiter, Rolf; Thulstrup, Erik W.; Bianco, Bernard; Gandillon, Gérard; Bürger, Ulrich

doi:10.1002/hlca.19830660231

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An Experimental Test For the Effect Of The σ-Bond Systems In1

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Cited by 8 publications

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“…On the other hand, an intense interaction of the pseudo-π-orbitals of the σ-systems with the aromatic π-system is suggested by the photoelectron spectra of 4Ϫ7 [8] and 11 [16] as well as the energies of the singlet excited states of 11. [17]…”

Section: An Experimental Test For the Effect Of The σ-Bond Systems Inmentioning

confidence: 99%

Experimental Assessment of the Effect of a Bicyclo[1.1.0]butane System in Strain‐Induced Localisation of Aromatic π‐Bonds

et al. 2003

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The geometrical parameters of the dimethyl pyridazine-1,4-dicarboxylates 13−16, in which a σ-bond system is annulated at the C5−C6 bond, have been determined by X-ray diffraction. As compared to the cyclopentene subunit in 16, which is believed to exert no significant influence on the bond lengths of the aromatic moiety, the norbornene, benzvalene, and bicyclo[2.1.1]hexene subunits of 13−15, respectively, cause alternating bond elongations and shortenings in the pyridazine moiety, with increasing magnitudes, in that order. These effects are in line with the heats of the isodesmic reac-

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Section: An Experimental Test For the Effect Of The σ-Bond Systems Inmentioning

confidence: 99%