Abstract
Optically pure (+)-2,3-trans-3,4-trans-flavan-3,3′,4,4′,7-pentaol [(+)-mollisacacidin] and (+)-2,3-trans-flavan-3,3′,4′,5,7-pentaol [(+)-catechin] condense rapidly in 0·1 M HCl to give good yields of 4,8-linked diastereoisomeric biflavonoid proanthocyanidins of all-trans and 2,3-trans-3,4-cis-2,3-trans configurations, and also the 4,6-linked all-trans isomer; c.d. comparison thus enables confirmation of the absolute configurations of three known 4,8-linked all-trans biflavonoids from black wattle bark as 2R,3S,4S–2R,3S, and also identification of a fourth as 2R,3S,4R–2R,3S.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
