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Evaluation of pulse sequences combining 13C-1H shift correlation and heteronuclear J spectroscopy with full 1H-1H decoupling

✍ Scribed by Marion Perpick-Dumont; William F. Reynolds; Raúl G. Enríquez

Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
616 KB
Volume
26
Category
Article
ISSN
0749-1581

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✦ Synopsis

Three different two-dimensional "C-'H shift-correlation sequences which detect 'H chemical shifts and one bond

'3C-'H[J(CH)I couplings in f, with full 'H-'H decoupling are described and evaluated. They are particularly useful for detecting small differences in 'J(CH) for nonquivalent methylene groups in natural products and other complex organic molecules. The best of the three allows determination of 'J(CH) and 'H chemical shifts to a precision better than 1 Hz, with sensitivity comparable to previous shift-correlation and J-resolved pulse sequences. 'J(CH) Values for a typical alkaloid suggest that these parameters are a useful probe of conformational, electronic and ring size effects in natural products.

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