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- W2048891698 abstract "Abstract Modified two‐dimensional (2D) triple‐resonance H(C)P and H(P)C experiments based on INEPT/HMQC and double‐INEPT schemes are applied to the study of organophosphorus compounds at natural abundances. The implementation of effective 1 H 13 C gradient selection, additional purging pulsed field gradients, spinlock pulses, and improved phase cycling is demonstrated to allow weak correlation signals based on long‐range couplings to be readily observed. Through the combination of two heteronuclear long‐range coupling constants, n J CH and n J PC in H(C)P experiments or n J PH and n J PC in H(P)C experiments, protons can be correlated to a second heteronucleus through 4–7 chemical bonds. These experiments thus overcome the inherit limitations of classical 1 H‐X HMBC experiments, which require a nonzero value of the heteronuclear coupling constant n J XH . Ultra‐broadband inversion composite pulses are successfully employed in the H(P)C INEPT/HMQC and H(P)C double‐INEPT pulse sequences to increase the utility of the experiments and the quality of obtained spectra. This work extends and completes a set of 2D phase‐sensitive triple‐resonance experiments applicable at natural abundances, and also offers insight into the methodology of triple‐resonance experiments and the application of pulsed field gradients. A one‐dimensional triple‐resonance experiment employing carbon detection is suggested for accurate determination of small n J PC . Copyright © 2007 John Wiley & Sons, Ltd." @default.
- W2048891698 created "2016-06-24" @default.
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- W2048891698 date "2007-07-30" @default.
- W2048891698 modified "2023-10-13" @default.
- W2048891698 title "H(C)P and H(P)C triple‐resonance experiments at natural abundance employing long‐range couplings" @default.
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- W2048891698 doi "https://doi.org/10.1002/mrc.2056" @default.
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