Journal
MAGNETIC RESONANCE IN CHEMISTRY
Volume 50, Issue 11, Pages 713-716Publisher
WILEY-BLACKWELL
DOI: 10.1002/mrc.3866
Keywords
BASHD-J-resolved-COSY; J-resolved-COSY; BASHD; selective excitation; multiplet signals; proton-proton coupling constants
Funding
- Ministry of Education, Culture, Sports, Science, and Technology [20580108, 24550108]
- Grants-in-Aid for Scientific Research [20580108, 24550108] Funding Source: KAKEN
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An effective pulse sequence for measuring HH coupling constants, named BASHD-J-resolved-COSY, has been developed. In the spin systems such as CHACHB(CH3)CHC, a methine proton HB splits into a multiplet owing to several vicinal couplings, resulting in attenuation of its cross-peak intensity. Therefore, the measurements of 3JHH with respect to HB are generally difficult in the E-COSY-type experiments. With the aim of accurate measurements of 3JH-H in such a spin system, we have developed a new pulse sequence, which selectively decouples the secondary methyl group. The proposed pulse sequence provides the simplified cross-peak patterns, which are suitable for reliable measurements of 3JH-H in a complicated natural product. Copyright (c) 2012 John Wiley & Sons, Ltd.
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