Lecture20outline

Lecture20outline - I. Review The Stork-Danheiser reaction...

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I. Review • The Stork-Danheiser reaction appears to be a 1,4-addition/elimination sequence of an organolithium reagent into a β -alkoxyenone • On closer examination, the reaction proceeds through the expected 1,2-addition to form a tertiary allylic alcohol that ionizes in the presence of acid to form an α , β -unsaturated oxocarbenium ion that react with water to for an α , β -unsaturated ketone • Carbohydrates are generally thought of as energy sources, but they have multiple important roles in biology • Carbohydrates also serve as signalling molecules in the metabolic process • Many cells have very specific carbohydrate patterns on their surfaces that play a role in inflammation and viral infection • Cancer cells have specific patterns of carbohydrates on their surfaces that can aid in devising vaccines for specific types of cancer • Carbohydrates also play an important structural role in structures like cellulose, DNA, and RNA • Carbohydrates are literally hydrates of carbon from a formula perspective, with a general molecular formula of (CH
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Lecture20outline - I. Review The Stork-Danheiser reaction...

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