Abstract
AbstractA complete and unambiguous assignment of the 1H and 13C NMR spectra of peracetylated catechin‐(4α‐8)‐catechin‐(4α‐8)‐catechin procyandin trimer was accomplished by reverse two‐dimensional chemical shift correlation methods. An HMBC spectrum showed, for the first time, evidence of the sites of condensation between the interflavan units of a trimer. The 2,3‐trans stereochemistry of the C‐ and F‐rings are easily deduced from measurement of 3J coupling constants. The multiplicity analysis of the protons of the i‐ring in the terminal unit does not lead to such an assignment. A ROESY experiment is needed to confirm the 2,3‐trans relationship. Molecular mechanics calculations explain the unexpected coupling constants of these protons.
Sign-in/Register to access full text options 
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.
