Reaktion von 2,3,4‐Tri‐ O ‐acetyl‐α‐ L ‐rhamnopyranosylbromid mit ethanolischer Trimethylamin‐Lösung

Reaction of 2,3,4‐Tri‐ O ‐acetyl‐α‐ L ‐rhamnopyranosyl Bromide with an Ethanolic Solution of Trimethylamine Reaction of 2,3,4‐tri‐ O ‐acetyl‐α‐ L ‐rhamnopyranosyl bromide ( 1 ) with an ethanolic solution of trimethylamine yielded 2,3‐di‐ O ‐acetyl‐1,2‐ O ‐(1‐ethoxyethylidene)‐β‐ L ‐rhamnopyranose (2) instead of 1,4‐Anhydro‐2,3‐di‐ O ‐acetyl‐α‐ L ‐rhamnopyranose ( 3 ) as was earlier described in the literature. The structure of compound 2 was established by analysis and spectroscopical data.