CHEM 2020 Lecture Notes - Lecture 12: Ozonolysis, Radical Ion, Dehydrohalogenation
24 Jan 2018
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Document Summary
For simplicity we ignore the fact that 3 moles of an alkene can react with each mole of. The simultaneous addition of boron and hydrogen to the double bond leads to a syn. Addition boron and hydrogen add across the double bond on the same side of the molecule. Anti addition boron and hydrogen add across the double bond on the opposite sides. A halogen molecule is electrophilic; a nucleophile can react with a halogen displacing a halide ion. Addition of halogens to an alkene creates a halonium ion. Iodination is not usually done because diiodide decomposes easily. Step two: the halide ion opens the halonium ion (attacks from back) The addition of bromine to cyclopentene is a stereospecific anti addition. Halohydrin is an alcohol with a halogen on the adjacent carbon atom. The electrophilic halogen adds to the alkene to give a halonium ion, which is also.
