Journal
MAGNETIC RESONANCE IN CHEMISTRY
Volume 50, Issue 11, Pages 717-721Publisher
WILEY
DOI: 10.1002/mrc.3867
Keywords
HSQMBC; HSQMBC-COSY; long-range proton-carbon coupling constants; IPAP
Funding
- MICINN [CTQ2009-08328, Consolider Ingenio-2010 CSD2007-00006]
- Bruker Espanola S.A.
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A spin state-selective Heteronuclear Single-Quantum Multiple-Bond Connectivities (HSQMBC-COSY) experiment is proposed to measure the sign and the magnitude of long-range proton-carbon coupling constants (nJ(CH); n?>?1) either for protonated or for non-protonated carbons in small molecules. The simple substitution of the selective 180 degrees 1H pulse in the original selHSQMBC pulse scheme by a hard one allows the simultaneous evolution of both proton-proton and proton-carbon coupling constants during the refocusing period and enables a final COSY transfer between coupled protons. The successful implementation of the IPAP principle leads to separate mixed-phase alpha/beta cross-peaks from which nJ(CH) values can be easily measured by analyzing their relative frequency displacements in the detected dimension. Copyright (c) 2012 John Wiley & Sons, Ltd.
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