@prefix prodottidellaricerca: . @prefix istituto: . @prefix prodotto: . istituto:CDS063 prodottidellaricerca:prodotto prodotto:ID39035 . @prefix rdf: . @prefix retescientifica: . prodotto:ID39035 rdf:type retescientifica:ProdottoDellaRicerca , prodotto:TIPO1101 . @prefix rdfs: . prodotto:ID39035 rdfs:label "EPR observation of cathodically-generated radical anions of colchicides and isocolchicides, and a comparison with the radical anions of troponoids. A general rationalization of the spin-density distribution in these systems (Articolo in rivista)"@en . @prefix xsd: . @prefix pubblicazioni: . prodotto:ID39035 pubblicazioni:anno "2002-01-01T00:00:00+01:00"^^xsd:gYear . @prefix skos: . prodotto:ID39035 skos:altLabel "
Cavazza M., Pinzino C., Pardi L., Nucci L., Pergola F., Pietra F. (2002)
EPR observation of cathodically-generated radical anions of colchicides and isocolchicides, and a comparison with the radical anions of troponoids. A general rationalization of the spin-density distribution in these systems
in Tetrahedron (Oxf., Print)
"^^rdf:HTML ; pubblicazioni:autori "Cavazza M., Pinzino C., Pardi L., Nucci L., Pergola F., Pietra F."^^xsd:string ; pubblicazioni:paginaInizio "9553"^^xsd:string ; pubblicazioni:paginaFine "9558"^^xsd:string ; pubblicazioni:numeroVolume "58"^^xsd:string . @prefix ns9: . prodotto:ID39035 pubblicazioni:rivista ns9:ID295069 ; skos:note "ISI Web of Science (WOS)"^^xsd:string ; pubblicazioni:titolo "EPR observation of cathodically-generated radical anions of colchicides and isocolchicides, and a comparison with the radical anions of troponoids. A general rationalization of the spin-density distribution in these systems"^^xsd:string ; prodottidellaricerca:abstract "Cathodic reduction of 10-ethylthiocolchicide (2), 9-ethoxyisocolchicide \n(3), 9-methylthioisocolchicide (4), 9-n-butylthioiso-colchicide\n(5), and 9-phenylthioisocolchicide (6) at a platinum electrode in DMF \nunder N2 gave the corresponding radical anions for which\nEPR spectra were recorded. Voltammetric analysis of these compounds \nrevealed a reversible wave at minimum scan rate 0.1\u00960.5 V s 2 1 .\nHyperfine coupling constants (hfcc) for these radical anions\u0097assigned by \nspectral simulation and DFT calculations of electron spin densities\u0097are \nhighest at the position adjacent to the carbonyl group. Decreasingly small \nhfccs were assigned, in the given order, to the g and b positions with \nrespect to the carbonyl group. This trend\u0097which is only marginally \naffected by oxygen, amino, and sulfur substituents\u0097can be qualitatively \nrationalized on the basis of classical resonance structures. These afford \nstability to the system in diminishing order for the unpaired electron at \nthe a, g,orb position with respect to the cycloheptatrienone carbonyl \ngroup, which corresponds to conjugation of the unpaired electron through \nthree, two, or one CvC bonds, respectively. Similar conclusions apply to a \nvariety of substituted troponoids." ; prodottidellaricerca:prodottoDi istituto:CDS063 . ns9:ID295069 pubblicazioni:rivistaDi prodotto:ID39035 .