The stereoselectivity of addition of benzoyloxyl radicals to trans-A2-octalin
Author(s)
Busfield, WK
Byriel, KA
Grice, ID
Jenkins, ID
Lynch, DE
Year published
2000
Metadata
Show full item recordAbstract
The stereochemistry of addition of benzoyloxyl radicals to the conformationally rigid cyclohexene, trans-2-octalin, in the presence of the free radical scavenger 1,1,3,3-tetramethyl-2,3-dihydro-1H-isoindol-2-yloxyl, is reported. Axial addition was favoured over equatorial addition with modest selectivity (axialequatorial = 1.71.0). The aminoxyl trapping reaction was more selective with a ratio of transcis addition of 4.41.0. Interestingly, when the benzoate group is axial, axial trapping by the sterically hindered aminoxyl is strongly favoured (axialequatorial = 7.41.0), whereas when the benzoate group is equatorial, there ...
View more >The stereochemistry of addition of benzoyloxyl radicals to the conformationally rigid cyclohexene, trans-2-octalin, in the presence of the free radical scavenger 1,1,3,3-tetramethyl-2,3-dihydro-1H-isoindol-2-yloxyl, is reported. Axial addition was favoured over equatorial addition with modest selectivity (axialequatorial = 1.71.0). The aminoxyl trapping reaction was more selective with a ratio of transcis addition of 4.41.0. Interestingly, when the benzoate group is axial, axial trapping by the sterically hindered aminoxyl is strongly favoured (axialequatorial = 7.41.0), whereas when the benzoate group is equatorial, there is only a small preference for equatorial trapping by the aminoxyl (equatorialaxial = 2.41.0). The structures of the four possible addition products were determined by 1H and 13C NMR spectroscopy, and confirmed in the case of the diaxial addition product [2(ax)-benzoyloxy-3(ax)-(1,1,3,3-tetramethyl-2,3-dihydroisoindol-2-yloxy)-trans-decalin 3] by X-ray crystallographic analysis.
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View more >The stereochemistry of addition of benzoyloxyl radicals to the conformationally rigid cyclohexene, trans-2-octalin, in the presence of the free radical scavenger 1,1,3,3-tetramethyl-2,3-dihydro-1H-isoindol-2-yloxyl, is reported. Axial addition was favoured over equatorial addition with modest selectivity (axialequatorial = 1.71.0). The aminoxyl trapping reaction was more selective with a ratio of transcis addition of 4.41.0. Interestingly, when the benzoate group is axial, axial trapping by the sterically hindered aminoxyl is strongly favoured (axialequatorial = 7.41.0), whereas when the benzoate group is equatorial, there is only a small preference for equatorial trapping by the aminoxyl (equatorialaxial = 2.41.0). The structures of the four possible addition products were determined by 1H and 13C NMR spectroscopy, and confirmed in the case of the diaxial addition product [2(ax)-benzoyloxy-3(ax)-(1,1,3,3-tetramethyl-2,3-dihydroisoindol-2-yloxy)-trans-decalin 3] by X-ray crystallographic analysis.
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Journal Title
Journal of the Chemical Society. Perkin Transactions 2
Volume
2000
Publisher URI
Copyright Statement
© 2000 Royal Society of Chemistry. This is the author-manuscript version of this paper. Please refer to the journal link for access to the definitive, published version.
Subject
History, heritage and archaeology