| | 1 | Author
| Bernd Wrackmeyer, Roland Köster, G. Ünter Seidel | Requires cookie* | | | Title
| Tricarbonyliron Complexes - Observation of 13C(CO) NMR Signals via Polarization Transfer  | | | | Abstract
| Improvements in the detection of 13C(CO) res onances by using polarization transfer techniques, based on long-range coupling constants "7(13C (C O)1H) = 1 ± 0.1 Hz (n > 3), are reported. Coupling constants between 13C(CO) and other rare spin-1/2 nuclei have been observed, and long-range 13C (C O)-'H coupling have been traced by two-dimensional (2 D) 13C/'H heteronuclear shift correlations (H ETC O R). Seven tricarbonyliron com plexes 1 to 5 serve as examples in which the [Fe(C O)3] fragment is linked to cyclic dienes (si-loles: la, b; l,l'-spirobisilole: 2), and to cyclic het erodienes derived from substituted | | | |
Reference
| Z. Naturforsch. 50b, 1127—1129 (1995); received November 17 1994 | | | |
Published
| 1995 | | | |
Keywords
| Tricarbonyliron Complexes, Cyclic Dienes, Cyclic Heterodienes, 13C NM R Spectra | | | |
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| default:Reihe_B/50/ZNB-1995-50b-1127_n.pdf | | | | Identifier
| ZNB-1995-50b-1127_n | | | | Volume
| 50 | |
| 2 | Author
| DavidS. Rycroft3, JosephD. Connolly3, SiegfriedH. Uneck, Uwe Himmelreich1 | Requires cookie* | | | Title
| Revised Structure of Haemoventosin | | | | Abstract
| The structure of the lichen pigm ent haem oventosin has been revised to 3,4,6,9-tetrahydro-5,10-dihydroxy-7-m ethoxy-3S-m ethyl-l,6,9-trioxo-l H-naphtho-[2,3-c]pyran (3), mainly on the basis of long-range <3C/<3H correlations observed in 2 D HM BC NMR experiments and long-range <5H/<5D isotope effects observed in partial deuteriation experiments with 10-0-acetylhaemoventosin; ortho-and /?öra-quinonoid structures were distinguished by means of the transacetylation inferred in the sodium dithionite reduction of lO-O-acetylhaemo-ventosin. | | | |
Reference
| Z. Naturforsch. 50b, 1557—1563 (1995); eingegangen am 13. März 1995 | | | |
Published
| 1995 | | | |
Keywords
| H aem oventosin, Naphthoquinone, O phioparm a ventosa, Lichen, 'H NMR Spectra, 13C NM R Spectra | | | |
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| default:Reihe_B/50/ZNB-1995-50b-1557.pdf | | | | Identifier
| ZNB-1995-50b-1557 | | | | Volume
| 50 | |
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