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The absolute configuration of (+)‐α‐ionone 3 ( R ), the absolute configurations at C(6) of (+)‐ cis ‐α‐irone 5 (6 S ) and (−)‐trans‐α‐irone 6 (6 R ), and the absolute configurations of (+)‐ cis ‐abscisic acid 10 ( S ) and (+)‐ trans ‐abscisic acid 11 ( S ) are deduced from the CD.‐spectra.
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Ohloff et al. (1973) studied this question.
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