A Novel Example of Reversible Ring Opening: The Epimerization at C(3) of Sugar 3‐Hydroxy‐Δ1‐pyrazolines Reaction of 1 (either geometrical isomer) with hydrazine followed by in situ Ag2O oxidation led to two pairs of interconverting isomers 4 ⇄ 5 and 6 ⇄ 7. By the same treatment, (Z)‐10 and (or) (E)‐...
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