The 6 R configuration of (+)‐cis‐γ‐irone [(+)‐4] was established by chemical correlation with (—)‐camphor. (+)‐cis‐γ‐irone [(+)‐4] was converted into (+)‐cis‐α‐irone [(+)‐1], (−)‐trans‐α‐irone [(minus;;)‐2], and (+)‐β‐irone [(+)‐3], which therefore also have the 6 R configuration. The 2 S configurations of (+)‐cis‐α‐irone [(+)‐1] and (+)‐trans‐α‐irone [(+)‐2] were determined by comparison of their circular dichroism with that of R‐α‐ionone [(+)‐5]. The 2 S configuration of (+)‐cis‐γ‐irone [(+)‐4] was established by chemical correlation with (+)‐cis‐α‐irone [(+)‐1].
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Rautenstrauch et al. (1971) studied this question.
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