Sterically Hindered Free-Radicals .22. Dimerization and Epr Spectroscopy of Indanedionyl and 9-Acylfluorenyl Radicals
| dc.contributor.author | Harnack, C. | en |
| dc.contributor.author | Krull, W. | en |
| dc.contributor.author | Lehnig, M. | en |
| dc.contributor.author | Neumann, W. P. | en |
| dc.contributor.author | Zarkadis, A. K. | en |
| dc.date.accessioned | 2015-11-24T16:47:53Z | |
| dc.date.available | 2015-11-24T16:47:53Z | |
| dc.identifier.issn | 0300-9580 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/9250 | |
| dc.rights | Default Licence | - |
| dc.subject | triphenylmethyl radicals | en |
| dc.subject | stabilization | en |
| dc.subject | diphenylmethyl | en |
| dc.subject | dimers | en |
| dc.subject | endor | en |
| dc.title | Sterically Hindered Free-Radicals .22. Dimerization and Epr Spectroscopy of Indanedionyl and 9-Acylfluorenyl Radicals | en |
| heal.abstract | 2-Phenylindanedionyl radicals 5a, their p- and o-monosubstituted derivatives and related compounds 5b-h recombine by C-C bond formation giving 6a-h. In contrast, o-substituted derivatives 5i-k and the 2-tert-butylindanedionyl radicals 5I react to give the enol ethers 10a-d by C-O coupling. The EPR data indicate that the substituents are more bulky in 5i-I than in 5a-h. From the proton splitting constants it is concluded that 5a is planar and 5h nearly planar (twist angle of the phenyl group ca. 30-degrees). The phenyl group in 5i is twisted considerably with an angle of about 50-degrees. The g values of 5i-k are larger than those of 5a-h indicating a higher spin density in the carbonyl groups. 9-Acylfluorenyl radicals 12b-c, representing the planar conformations of diarylmethyl radicals 1 c, d, give no enol ethers like 4, but recombine by C-C bond formation yielding 13b-c. Their g values indicate that the acyl groups are twisted out of the radical plane. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1039/P29940001247 | - |
| heal.identifier.secondary | <Go to ISI>://A1994NQ34100021 | - |
| heal.identifier.secondary | http://pubs.rsc.org/en/Content/ArticleLanding/1994/P2/p29940001247 | - |
| heal.journalName | Journal of the Chemical Society-Perkin Transactions 2 | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 1994 | - |
| heal.publisher | Royal Society of Chemistry | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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