(a) Give a biosynthetic mechanism for the formation of the cyclic terpene limonene (Fig. 17.4) beginning with...

Question:

(a) Give a biosynthetic mechanism for the formation of the cyclic terpene limonene (Fig. 17.4) beginning with an intramolecular reaction of the following carbocation. (Assume acids and bases are present as necessary.) +CH

(b) Draw a curved-arrow mechanism for the biosynthesis of the carbocation intermediate in part (a) from geranyl pyrophosphate. HC. HC COH Fev protein (a) CH3 CH3 from a cysteine residue of the protein COH Fev S (b) protein FIGURE 17.4