title: Determination of unresolved heteronuclear scalar coupling constants by J(up)-HSQMBC.
abstract: Long-range heteronuclear scalar coupling constants provide important structural information, which is necessary for obtaining stereospecific assignment or dihedral angle information. The measurement of small proton-carbon splittings is particularly difficult due to the low natural abundance of carbon-13 and the presence of homonuclear couplings of similar size. Here we present a real-time J-upscaled HSQMBC, which allows the measurement of heteronuclear coupling constants even if they are hidden in the signal linewidth of a regular spectrum.
authors.affiliation: Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Austria.
authors.forename: Simon
authors.initials: S
authors.lastname: Glanzer
authors.affiliation: Institute of Pharmaceutical Sciences/Pharmaceutical Chemistry, University of Graz, Austria.
authors.forename: Olaf
authors.initials: O
authors.lastname: Kunert
authors.affiliation: Institute of Chemistry/Organic and Bioorganic Chemistry, University of Graz, Austria. Electronic address: klaus.zangger@uni-graz.at.
authors.forename: Klaus
authors.initials: K
authors.lastname: Zangger
keywords: Band-selective decoupling; HMBC; Homonuclear decoupling; J-upscaling; NMR spectroscopy; Structure analysis