Abstract
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° 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 α/β cross-peaks from which nJ(CH) values can be easily measured by analyzing their relative frequency displacements in the detected dimension. Copyright © 2012 John Wiley & Sons, Ltd.
Original language | English |
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Pages (from-to) | 717-721 |
Journal | Magnetic Resonance in Chemistry |
Volume | 50 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1 Nov 2012 |
Keywords
- HSQMBC
- HSQMBC-COSY
- IPAP
- long-range proton-carbon coupling constants