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1	Author	HartmutB. Stegmann, Klaus Stolze, Klaus Schelfler	Requires cookie*
	Title	ESR-Untersuchungen des Adrenalon-Semichinons und analoger Verbindungen ESR-Investigations of Adrenalone-Semiquinones and Related Compounds
	Abstract	The autoxidation of adrenalone and other 4-acyl-catecholamines in the presence of diorganothalliumhydroxide are investigated by ESR-spectroscopy. On the basis of the counterion splitting and the proton coupling constants as well as the g-values a semi-quinone structure was established. By comparing several monosubstituted o-benzosemi-quinones an increment system for the assignment of the different proton coupling constants was developed. The agreement between experimental and calculated values is good for all compounds investigated. Prolonged autoxidation of adrenalone yields a stable para-magnetic secondary product.
	Reference	Z. Naturforsch. 38b, 243—247 (1983); eingegangen am 1. September 1982
	Published	1983
	Keywords	Adrenalone, Semiquinones, ESR Spectra
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	TEI-XML for	default:Reihe_B/38/ZNB-1983-38b-0243.pdf
	Identifier	ZNB-1983-38b-0243
	Volume	38

2	Author	E. N. Esr, HartmutB. Stegmann, Klaus Stolze, Klaus Scheffler	Requires cookie*
	Title	ESR-und ENDOR-Untersuchungen der Autoxidationsprodukte des Adrenalons und analoger Verbindungen Investigations of the A utoxidation Products of Adrenalone and Related Compounds
	Abstract	The signs of the proton coupling constants of adrenalone sem iquinone and related compounds were determ ined by E N D O R and T R IP L E resonance studies, thereby verifying the increment system described in our previous paper [2], Com parison of the spin-distribution of several substi tuted acylcatechols showed the conform ational influence on the coupling constants due to mesomeric interaction of the carbonyl group with the arom atic 7r-system. A drenalone and other N -m onosubstituted catecholam ines showed rather stable secondary radi cals after the decay of the prim ary sem iquinone radical. They were identified as substituted dihydropyrazinium cation radicals after selective deuteration and comparison of their ESR-, EN D O R -and TRIPLE -resonance spectra with those of the non-deuterated species. They are formed by cyclic condensation of two molecules with subsequent oxidation. E in fü h ru n g
	Reference	Z. Naturforsch. 41b, 776 (1986); eingegangen am 24. Januar 1986
	Published	1986
	Keywords	A drenalone, Semiquinones, ESR Spectra, E N D O R Spectra
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	TEI-XML for	default:Reihe_B/41/ZNB-1986-41b-0776.pdf
	Identifier	ZNB-1986-41b-0776
	Volume	41