Colnelenic acid

A novel enzyme system, so far only identified in potato tubers, converts the 9-hydroperoxides of linoleic and linolenic acids to divinyl ether derivatives (colneleic and colnelenic acids, respectively) in which an atom of oxygen is inserted into the fatty acid chain (Galliard and Phillips, 1972 Galliard... 

Colneleic and colnelenic acids are degraded by oxidative cleavage of the ether to form aldehydic fragments. The. degradation is catalyzed by an enzyme in potato tubers but also occurs in the presence of Fe " ions and some nonheme proteins, e.g., ferredoxin. 

Isomers of colneleic and colnelenic acids were isolated from homogenates of leaves of Clematis vitalba (Ranunculaceae). 

Up to now this reaction has only been observed with extracts of potato tubers. The 9-hydroperoxy isomers of linoleic and linolenic acids appear to be the exclusive substrates for the reaction. During the reaction one of the hydroperoxy oxygen atoms is inserted into the fatty acid chain to form a divinyl ether linkage. The products from linoleic and linolenic acids have been termed colneleic and colnelenic acids, respectively (5) (Fig. 2). 

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