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The conformational behavior of the cyclohexenone ring in abscisic acid (1) and its analogs (2-5) with a fused cyclopropyl ring was investigated by a low-temperature NMR analysis and computer-aided calculations of the model compounds. The 1 H signals of 1 separated into two sets below 250K, which was a coalescence temperature, in a 99.4:0.6 ratio at 185K, although the small set of signals was...
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