Construct 2 keygen9/1/2023 ![]() ![]() In such cases, recourse to the ADEQUATE experiments should be considered. Despite the versatility and extensive applications of the HMBC experiment, it can still fail to elucidate structures of molecules that are highly proton-deficient, e.g., those that fall under the so-called "Crews rule". The two-bond and four-bond outliers must be identified specifically to avoid spectral and/or structural misassignment. The (1)H-(13)C HMBC experiment provides a versatile and relatively sensitive means of establishing predominantly (3)JCH connectivity with the occasional (2)JCH or (4)JCH correlation being observed. Long-range heteronuclear shift correlation methods have served as the cornerstone of modern structure elucidation protocols for several decades. ![]()
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