𝔖 Bobbio Scriptorium
✦   LIBER   ✦

EPR and ENDOR investigation of daunomycin and adriamycin semiquinones

✍ Scribed by Thomas Jülich; Klaus Scheffler; Paul Schuler; Hartmut B. Stegmann

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
435 KB
Volume
26
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Electron spin resonance and ENDOR spectra of semiquinones from daunomycin, adriamycin, their derivatives and model compounds are reported. Hyperfme coupling constants were assigned with the help of TRIPLE resonance and partial deuteration. In contrast to published results, the data obtained were interpreted on the basis of a rapid conformational interconversion of ring A with participation of half chair and boat conformers.

📜 SIMILAR VOLUMES

EPR and ENDOR investigations of chrysazi
EPR and ENDOR investigations of chrysazin and aclacinomycin A semiquinones
✍ Thomas Jülich; Hartmut B. Stegmann; Karsten Krohn; Astrid Eickhoff 📂 Article 📅 1991 🏛 John Wiley and Sons 🌐 English ⚖ 403 KB

Different assignments of the coupling constants to distinct positions of chrysazin are given in the literature. Several methyl derivatives, particularly the hitherto unknown l,&dihydroxy-2,3-dimethyl-9,lBanthraquinone, were prepared, and their radical anions were investigated by EPR and ENDOR spectr

Synthesis, EPR, ENDOR and TRIPLE resonan
Synthesis, EPR, ENDOR and TRIPLE resonance investigations of anthracycline-related semiquinones
✍ Hartmut B. Stegmann; Thomas Jülich; Ulrike Höfler; Paul Schuler; Wolfhard Koch; 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 419 KB

## Abstract The synthesis of five substituted anthraquinones related to anthracyclines is described. One‐electron reduction of these compounds yields the corresponding semiquinones, which were characterized by EPR, ENDOR and TRIPLE resonance spectroscopy. The data indicate a rapid conformational in

EPR, ENDOR and EPR Imaging of Defects in
EPR, ENDOR and EPR Imaging of Defects in Diamond
✍ M. E. Newton 📂 Article 📅 2007 🏛 John Wiley and Sons ⚖ 11 KB 👁 1 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

EPR, ENDOR and ESE investigations on chr
EPR, ENDOR and ESE investigations on chromium modified PbTiO3 ceramics
✍ R. Böttcher; W. Brunner; B. Milsch; G. Völkel; W. Windsch; S.T. Kirillov 📂 Article 📅 1986 🏛 Elsevier Science 🌐 English ⚖ 304 KB

EPR and ENDOR studies show that chromium is incorporated in monocrystalline regions of the grains in PbTiOs ceramics as Cr5+ ions at Ti4' sites. The local symmetry of the Cr5+ impurity is lower than of the host Ti4\* site in the crystallite. ESE measurements of the spin-lattice relaxation of the Cr5

EPR and ENDOR study of chiral nitroxides
EPR and ENDOR study of chiral nitroxides
✍ Hartmut B. Stegmann; Frank-Martin Schaber; Paul Schuler; Klaus Scheffler 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 408 KB

Racemic and achiral alkyl aryl nitroxides were examined at various temperatures. The restricted rotation of the aminoxyl substituents was indicated both by the β-proton coupling constants and by the inequivalence of the aromatic ortho protons. These results are interpreted by the presence of two dif