Chemistry CHEM S-20ab Lecture Notes - Lecture 4: Cyclohexene, Syn And Anti Addition, Bromine
30 Apr 2018
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Chemistry E-2a: Lecture 3 October 2, 2008
9
An Introduction to Reactions of Alkenes
• A review: What are the important orbitals in an alkene?
• Let’s see if we can predict what will happen in the following reaction:
+HBr
Reading: Section 4.7
Chemistry S-20ab
Week 1
52
Chemistry E-2a: Lecture 3 October 2, 2008
10
Regioselectivity: “Markovnikov!s Rule”
• Now consider the following reaction. Can you predict what will happen?
+
HBr
• What is the observed product of this reaction? What does this observation tell you about
the mechanism of this reaction?
• Is there a general rule that we can formulate about alkene additions?
• The central lesson: First, predict what will happen. Then, compare that prediction with
the experimental result. Finally, refine your understanding of the reaction. PCR!
Reading: Section 4.7
Chemistry S-20ab
Week 1
53
