## Abstract The relative configuration of the two xanthene units of neosartorin, a new ergochrome biosynthesised by the soil mould __Neosartorya fischeri,__ was determined using a 1D doubleβpulsed field gradient spinβecho NOESY experiment. It was found that both units have the same relative stereoc
Application of the nuclear overhauser effect difference experiment: Assignment of the configuration of carboprostacyclin
β Scribed by G. Kotovych; G. H. M. Aarts
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 411 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
Nuclear Overhauser effect difference experiments, together with difference decoupling and inversion recovery measurements, have allowed the complete assignment of the proton magnetic resonance spectrum of carboprostacyclin. The nuclear Overhauser effect measurements prove the 5E configuration at Cβ5 for carboprostacyclin. Protons Hβ2,2*, Hβ3,3*, and Hβ4,4* are observed to be nonequivalent due to the asymmetric nature of this molecule.
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Gradient enhanced nuclear Overhauser effect spectroscopy (GOESY) has been applied in the structural elucidation of five plant secondary metabolites: eucalyptin, arctigenin, 5-geranyloxy-7-methoxycoumarin, 2,6-dihydroxy-4-methoxyisovalerophenone and N-feruloyltyramine. The importance and sensitivity
Important intrinsic characteristics of the rotating frame nuclear Overhauser effect spectroscopy (ROESY) experiment were found to be advantageous in DNA solution structure determination. In a ROESY experiment, the different mechanisms of relaxation result in different signs of cross peaks, enabling