期刊
MAGNETIC RESONANCE IN CHEMISTRY
卷 51, 期 9, 页码 509-516出版社
WILEY-BLACKWELL
DOI: 10.1002/mrc.3977
关键词
selHSQMBC; proton-carbon coupling constants; HSQMBC; HMBC; IPAP
资金
- MICINN [CTQ2009-08328, CTQ2012-32436]
- Bruker Espanola S.A.
The effects of phase modulation due to homonuclear proton-proton coupling constants in HSQMBC-IPAP and HMBC-IPAP experiments are experimentally evaluated. We show that accurate values of small proton-carbon coupling constants, (n)J(CH), can be extracted even for phase-distorted cross-peaks obtained from a selHSQMBC experiment applied simultaneously on two mutually J-coupled protons. On the other hand, an assessment of the reliability of (n)J(CH) measurement from distorted cross-peaks obtained in broadband IPAP versions of equivalent HMBC and HSQMBC experiments is also presented. Finally, we show that HMBC-COSY experiments could be an excellent complement to HMBC for the measurement of small (n)J(CH) values. Copyright (c) 2013 John Wiley & Sons, Ltd.
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