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dc.contributor.authorKukol, A.
dc.contributor.authorStrehle, F.
dc.contributor.authorThielking, G.
dc.contributor.authorGrutzmacher, H. F.
dc.date.accessioned2011-10-18T12:01:18Z
dc.date.available2011-10-18T12:01:18Z
dc.date.issued1993-10
dc.identifier.citationKukol , A , Strehle , F , Thielking , G & Grutzmacher , H F 1993 , ' Methyl-group effect on the proton affinity of methylated acetophenons studied by two mass-spectrometric techniques ' , Organic Mass Spectrometry , vol. 28 , no. 10 , pp. 1107-1110 .
dc.identifier.issn0030-493X
dc.identifier.otherPURE: 420070
dc.identifier.otherPURE UUID: c6259cad-9647-4d69-8708-462cf5daf86e
dc.identifier.otherWOS: A1993MJ25900019
dc.identifier.otherScopus: 84989065516
dc.identifier.urihttp://hdl.handle.net/2299/6700
dc.descriptionFull text of this article is not available in the UHRA
dc.description.abstractThe proton affinities (PA) of all isomeric dimethylacetophenones were determined using the 'kinetic method' with a tandem mass spectrometer and by measurements of the proton transfer equilibrium in the gas phase by Fourier transform ion cyclotron resonance mass spectrometry. For both methods acetophenone and p-methylacetophenone, with well known PA values, were used as reference bases. Both methods yielded identical PA values for all dimethylacetophenones. The PA of the dimethylacetophenones were in a narrow range between 872 and 880 kJ mol-1 except for 2,6-dimethylacetophenone, for which a PA of 856 kJ mol-1 was found. The results are discussed in terms of possible mesomeric structures stabilizing the positive charge with regard to the substitution pattern in the phenyl ring. Obviously, the significant smaller PA of 2,6-dimethylacetophenone compared with the other isomers is due to the distortion of the conjugation of the C-O double bond with the aromatic pi system.en
dc.format.extent4
dc.language.isoeng
dc.relation.ispartofOrganic Mass Spectrometry
dc.subjectGAS-PHASE BASICITIES
dc.subjectION THERMOCHEMISTRY
dc.subjectKINETIC METHOD
dc.subjectAMINO-ACIDS
dc.subjectRESONANCE
dc.subjectORDER
dc.titleMethyl-group effect on the proton affinity of methylated acetophenons studied by two mass-spectrometric techniquesen
dc.contributor.institutionSchool of Life and Medical Sciences
dc.contributor.institutionDepartment of Human and Environmental Sciences
dc.contributor.institutionHealth & Human Sciences Research Institute
dc.contributor.institutionAgriculture, Veterinary and Food Sciences
dc.contributor.institutionPharmacology and Clinical Science Research
dc.contributor.institutionCardiovascular Pathologies
dc.contributor.institutionBiochemistry and Bioinformatics
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Life and Medical Sciences
dcterms.dateAccepted1993-10
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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