Homonuclear Band-selective Decoupling

It has been demonstrated recently [16,38-41] that homonuclear band-selective decoupling can be used as an efficient means of simplification of multiplet 

---

V.M.R. Kakita, J. Bharatam, Real-time homonuclear broadband and band-selective decoupled pure-shift ROESY, Magn. Reson. Chem. 52 (2014) 389—394. 

Broadband Hartmann-Hahn sequences, such as DIPSI-2 or WALTZ-16, can be made band-selective by reducing the rf amplitude of the sequences (Brown and Sanctuary, 1991). Richardson et al. (1993) used a low-amplitude WALTZ-17 sequence for band-selective heteronuclear Hartmann-Hahn transfer between N and in order to minimize simultaneous homonuclear Hartmann-Hahn transfer between and The DIPSI-2 sequence was successfully used by Gardner and Coleman (1994) for band-selective Hartmann-Hahn transfer between C d and H spins. So far, no crafted multiple-pulse sequences have been reported that were optimized specifically for band-selective heteronuclear Hartmann-Hahn transfer. Based on the results of Section X, it is expected that such sequences with well defined regions for coherence transfer and effective homonuclear decoupling will result in increased sensitivity of band-selective heteronuclear Hartmann-Hahn experiments. 

Figure 5 Band-selective homonuclear H- H WURST decoupling of Si(CH2)CH3 resonances in compound 1 recorded at 400 MHz ( H) frequency on a Varian Unity Plus spectrometer, (a) The ordinary spectrum (b) expansion of the Si-H region of (a) (c) the same as (b) in a band-selectively H- H decoupled spectrum with decoupling band centred on SiCH2 and SiCHj peaks between -0.6 and +0.6 ppm...

Garbow JR, Weitekamp DP, Pines A (1982) Bilinear rotation decoupling of homonuclear scalar interactions. Chem Phys Lett 93 504-509 Gamier J, Mahuteau J, Plat M, Merienne C (1989) The complete assignment of the C and NMR spectra of jadiffine. Phytochemistry 28 308-309 Geen H, Freeman R (1991) Band-selective radiofrequency pulses. J Magn Reson 93 93-141... 

ROESY spectrum can be achieved with a BASHD-ROESY pulse sequence, incorporating band selection and homonuclear decoupling in the H" region of the spectra. Band selection in the evolution dimension is performed with the DPFGSE technique as described above. 

---