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13C1H shift correlation with full 1h1H decoupling

✍ Scribed by Marion Perpick-Dumont; William F. Reynolds; Raul G. Enriquez

Publisher: John Wiley and Sons
Year: 1988
Tongue: English
Weight: 396 KB
Volume: 26
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.1260260503

No coin nor oath required. For personal study only.

✦ Synopsis

A pulse sequence for obtaining 13C-lH shift-correlated spectra with full 'H-'H decoupling b described and evaluated. It is concluded that the sequence provides excellent resolution, even for strongly coupled methylene group The sensitivity is superior to those of existing sequences based on "C detection for organic compoonds in tbe molecular weight range up to CQ 500. KEY WORDS I3C-'H shift correlated spectra Full 'H-'H decoupling Pulse sequence shift-correlated sequence with vicinal I H-'H dec~upling;~ (c) COLOC-based 13C-' H shin-correlated sequen~e;~.' (d) modified COLOC-based sequence evaluated in this work. The subscript after each pulse refers to the phase (@) listed in Table 1.

into T.6v7

Consequently, some of the potential advantages of full 'H-'H decoupling are lost.

Better resolution can be obtained by choosing T % (2n + 1)/2J(CH), where n 2 Z7 However, this introduces two new problems. First, in molecules with a range of 'J(CH) values, there will be inefficient polarization transfer for carbons where 'J(CH) differs significantly from the average value used to determine T.7

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