A detailed analysis of the proton magnetic resonance (PMR) spectra of humulinic acid A and humulinic B shows that the former is the trans and the the latter the cis form with structures I and II respectively. Evidence is advanced that J trans is smaller than J cis in ring compounds with several sp 2 carbon atoms in the ring.
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Alderweireldt et al. (1964) studied this question.
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