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Opening the oxirane ring of 12,13-epoxydesmycosin dimethylacetal (1) by catalytic hydrogenation gave the 10,11-dihydro-12,13-epoxy derivative (3) as the main product. Reductive oxirane cleavage was accomplished with dissolved metal (Zn) giving the 10,13-dihydro-13-hydroxy compound (6). Mild acid hydrolysis of 6 gave expected 10,13-dihydro-13-hydroxydesmycosin (8), but hydrolysis of 3, under the same conditions, gave three tautomeric desepoxy products.

Nwe Dihydro and Tetrahydro Derivatives of Desmycosin. III. The Opening of Oxirane Ring of 12,13-Epoxydesmycosin.