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Cleavage of phorbol-3-ol-12,13,20-triacetate with sodium-periodate proves the presence of an α,β- unsaturated tertiary 1,2-ketol group in phorbol and its location in the five-membered ring. Accordingly 4-O-methyl-phorbol-3-ol-12,13,20-triacetate is not cleaved by sodium periodate, and by zinc/acetic acid phorbol-12,13,20-triacetate is converted to a 4-deoxy-compound.

Zur Chemie des Phorbols, VII: Die α, β-ungesättigte tertiäre 1.2-Ketolgruppierung im Phorbol