Hydrohalogenation of Alkynes | HBr vs HBr/ROOR | 9.5 Organic Chemistry

Chad covers hydrohalogenation of alkynes in this lesson. He reviews hydrohalogenation of alkenes which involves the Markovnikov addition of hydrogen and a halogen across an alkene and the anti-Markovnikov addition of HBr with a peroxide. He then proceeds that both of these reactions can be performed on alkynes either once or twice depending on how much of the reagents are used (1 equivalent or 2). Finally, Chad also shows how with an internal alkyne Markovnikov and anti-Markovnikov don’t apply as both sides of the alkyne are equally substituted and therefore a mixture of products results.

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00:00 Lesson Introduction
00:22 Review of Hydrohalogenation of Alkenes
00:50 Hydrohalogenation of Terminal Alkynes (Markovnikov)
03:48 Hydrohalogenation of an Internal Alkyne
04:38 Addition of HBr / ROOR

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