Oligomeric Flavanoids. Part 6. Evidence Supporting the Inversion of Absolute Configuration at 3-C Associated with Base Catalyzed A-/B-Ring Interchange of Precursors Having 2,3-trans-3,4-cis-Flavan-3-ol Constituent Units

s i n g i n t e r c h a n g e d r e s o r c i n o l A-and pyrocatechol 8 -r i n g s leg.( 28).(30) vs. (g), (25) 1 r e q u i r e d by t h e mechanism f o r t h e i r formation, a r e unequivocally confirmed by comparison of the cd d a t a of t h e d i f f e r e n t enantiomeric-and quasi-enantiomeri... View More