Regioselective addition reactions of group IVB organometallic radicals with p-diones. An ESR study |
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| Authors: | Angelo Alberti Andrew Hudson Gian Franco Pedulli Paolo Zanirato |
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| Institution: | Laboratorio dei Composti del Carbonio Contenenti Eteroatomi e loro Applicazioni, C.N.R., Via Tolara di Sotto 89, 40064 Ozzano Emilia (BO Italy;School of Molecular Sciences, University of Sussex, Brighton BN1 9QJ Great Britain;Istituto Chimico dell''Università, Via Ospedale 72, 09100 Cagliari Italy;Istituto di Chimica Organica dell''Università, Viale Risorgimento 4, 40136Bologna Italy |
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| Abstract: | The group IVB organometallic radical adducts of a number of substituted p-diones and related compounds have been investigated by ESR spectroscopy. In the case of substrates with unequivalent carbonyl groups two distinct isomeric adducts have been detected, and the factors affecting the regioselectivity of the addition reaction are discussed.The magnitude of the hyperfine splitting constants at the metal atoms and the trend of the g-values are consistent with a conformation for the adducts where the organometallic substituent eclipses the pπ orbital on the radical centre. |
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