Abstract
Cathedulin E2 yields on ethanolysis a new 1-eq, 2-ax, 8-ax, 9-ax, 15-pentahydroxylated agarofuran, as deduced from 1H, 13C, and nuclear Overhauser n.m.r. Data, together with cyclic carbonate formation. Ethyl acetate, benzoate, and nicotinate in the molar ratio 2 : 1 : 2 are also produced. Graded alcoholysis (methanolic triethylamine, 5°C) gives an 8-denicotinoyl derivative identical with cathedulin E8 from Catha edulis, whilst at 25 °C the 8,15-bis(denicotinyl) derivative is produced. Aqueous-methanolic sodium hydrogencarbonate further strips the 1- and 2-acetate residues leaving only the 9-benzoate ester. The placing of these ester residues is deduced from a study of the spectral changes caused by graded hydrolysis, thus leading to complete structural proposals for cathedulin E2 and E8.
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 callMore From: Journal of the Chemical Society, Perkin Transactions 1
Disclaimer: 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.
