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13C1H shift correlation with full 1H1H decoupling. II —Further significant improvements in resolution and sensitivity

In previous work a modified COLOC sequence combined with a selective BIRD pulse which allows one to obtain one‐bond 13C1H shift‐correlated spectra with full 1H1H decoupling and good (ca 15 Hz)f1 resolution, in addition to improved sensitivity over earlier sequences measured under the same conditions, was developed. In this paper it is demonstrated that a further modification of this sequence to allow the pair of 1H and 13C 180° pulses to traverse the entire fixed evolution period allows excellent (ca 7–8 Hz) f1 resolution plus a further increase in sensitivity (in the same time) of almost √2. Factors contributing to the sensitivity advantages relative to other sequences were examined. Whereas some artifacts are noted for tightly coupled CH2 groups, these may actually aid in the accurate determination of very small chemical shift differences. The precision of measurement of 1H chemical shifts is ca 1 Hz.