Because caronic acid is optically active, its carboxyl groups must be trans to each other. (Thecis stereoisomer is an optically inactive meso form.) The structure of (1)-chrysanthemic acidmust therefore be either the following or its mirror image.The carboxyl group and the 2-methyl-1-propenyl side chain must be trans to each other.26.20(a)Hydrolysis of phrenosine cleaves the glycosidic bond. The carbohydrate liberated by thishydrolysis is D-galactose.Phrenosine is a b-glycoside of D-galactose.(b)The species that remains on cleavage of the galactose unit has the structureThe two substances, sphingosine and cerebronic acid, that are formed along with
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