Spectra and some aspects of conjugation in allene compounds
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Substantial deviations from additivity were detected in the spectra and dipole moments of the allene compounds R′ HC =C =C−ZRn″, in which the heavy Z atoms are connected directly to the allenyl grouping.
The observed phenomena can be explained within the framework of the concepts regarding the overlapping of the electron clouds of the C-Z σ-bond and the π-bond of the C =C furthest away from the heavy atom, under the condition of a close proximity in the energy levels of the fragments.
KeywordsEnergy Level Dipole Moment Heavy Atom Electron Cloud Allene Compound
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