Chapter 31: Q20P (page 1250)
One component of lanolin, the wax that coats sheep’s wool, is derived from cholesterol and stearic acid. Draw its structure, including the correct stereochemistry of all stereogenic centers.
Short Answer
Answer
Chapter 31: Q20P (page 1250)
One component of lanolin, the wax that coats sheep’s wool, is derived from cholesterol and stearic acid. Draw its structure, including the correct stereochemistry of all stereogenic centers.
Answer
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Get started for freeThe main fatty acid component of the triacylglycerols in coconut oil is lauric acid, . Explain why coconut oil is a liquid at room temperature even though it contains a large fraction of this saturated fatty acid.
Farnesyl diphosphate is cyclized to sesquiterpene A, which is then converted to the bicyclic product epi-aristolochene. Write a stepwise mechanism for both reactions.
An isoprene unit can be thought of as having a head and a tail. The “head” of the isoprene unit is located at the end of the chain nearest the branch point, and the “tail” is located at the end of the carbon chain farthest from the branch point. Most isoprene units are connected together in a “head-to-tail” fashion, as illustrated. For both lycopene (Problem 31.26), and squalene (Figure 31.9), decide which isoprene units are connected in a head-to-tail fashion and which are not.
Classify each terpene and terpenoid in Problem 31.26 (e.g., as a monoterpene, sesquiterpene, etc.).
Unlike many fats and oils, the cocoa butter used to make chocolate is remarkably uniform in composition. All triacylglycerols contain oleic acid esterified to the OH group of glycerol, and either palmitic acid or stearic acid esterified to the OH groups. Draw the structures of two possible triacylglycerols that compose cocoa butter.
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