A Novel Example of Reversible Ring Opening: The Epimerization at C(3) of Sugar 3‐Hydroxy‐Δ 1 ‐pyrazolines Reaction of 1 (either geometrical isomer) with hydrazine followed by in situ Ag 2 O oxidation led to two pairs of interconverting isomers 4 ⇄ 5 and 6 ⇄ 7 . By the same treatment, (Z)‐ 10 and (or...
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