most of the additions of bromine to double bonds gave entirely antistereochemistry. Explain why the addition to phenanthrene gives a mixture of synand anti stereochemistry.  When the product from (c) is heated, HBr is evolved and 9-bromophenanthrene results.Propose a mechanism for this dehydrohalogenation.

Organic Chemistry
8th Edition
ISBN:9781305580350
Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Chapter19: Enolate Anions And Enamines
Section: Chapter Questions
Problem 19.40P: Enamines normally react with methyl iodide to give two products: one arising from alkylation at...
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most of the additions of bromine to double bonds gave entirely anti
stereochemistry. Explain why the addition to phenanthrene gives a mixture of syn
and anti stereochemistry.
  When the product from (c) is heated, HBr is evolved and 9-bromophenanthrene results.
Propose a mechanism for this dehydrohalogenation.

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