<sup>13</sup>C Nuclear Magnetic Resonance Studies. 45. The <sup>13</sup>C Spectra of Some β,γ Unsaturated Polycyclic Ketones
抄録
<jats:p> The <jats:sup>13</jats:sup>C spectra of several β,γ unsaturated polycyclic ketones have been recorded to examine the shielding differences for all carbons relative to those for their saturated analogs and the parent olefins. The variations of the sp<jats:sup>2</jats:sup> carbon shieldings provide qualitative evidence for the existence of homoconjugative interactions between the olefinic and carbonyl groups in the ground state. Similar evidence of interaction between γ,δ double bonds and carbonyl groups was found from spectra for a few examples. A simple interpretation of the shielding trends entirely in terms of charge density variations arising from through space polarization is shown to be inadequate, thereby emphasizing the existence of other major shielding contributions. </jats:p>
収録刊行物
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- Canadian Journal of Chemistry
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Canadian Journal of Chemistry 53 (4), 581-588, 1975-02-15
Canadian Science Publishing
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詳細情報 詳細情報について
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- CRID
- 1360011145382279040
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- NII論文ID
- 30021723295
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- DOI
- 10.1139/v75-081
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- ISSN
- 14803291
- 00084042
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- データソース種別
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