CHEM 213 Chapter Notes - Chapter 11.12-11.15: Bromoethane, Peroxy Acid, Syn And Anti Addition
20 Feb 2017
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Dialkyl ethers react with few things besides acids: lack of reactivity combined with ability to solvate cations makes dialkyl ethers good solvents. Ethers can make oxonium salts by reacting with proton donors (acids: which is an ether a positively charged o (due to an added proton) Cleaving ethers: ethers can be cleaved by reacting dialkyl ethers with strong acids plus heat. Causes c o bond to break, making two identical alkyl groups: mechanism. 1. formation of an oxonium salt by addition of an acid (ex. Hbr: the h is rst donated, then the ion grabs off a carbon from the oxygen, forming an ethyl bromide and an ethanol. 2. ethanol reacts with hr and makes another ethyl bromide and a water. Epoxides = cyclic ethers with three-membered rings: also called oxiranes. Synthesis of epoxides: epoxidation reacting alkene with a proxy acid (r co3h a. k. a. a peracid) Forms an epoxide and a carboxylic acid. Syn addition of oxygen to the alkene.
