| Abstract: | 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 ]. |
