AbstractThe first syntheses ofsyn‐12‐hydroxydieldrin,syn‐12‐hydroxyendrin andanti‐12‐hydroxyendrin have been accomplished by debenzoylation and epoxidation of three isomeric adduction products of hexachlorocyclopentadiene and 1,7,7‐trinorborna‐2,5‐dien‐7‐yl benzoate. A third known metabolite of endrin, 12‐ketoendrin, and a putative metabolite of dieldrin, 12‐ketodieldrin, were prepared from the corresponding alcohols by oxidation with chromium trioxide. Characterisation of the three debenzoylated intermediates assyn‐12‐hydroxyaldrin, andsyn‐ andanti‐12‐hydroxyisodrin constitutes the first syntheses of these three possibl
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