week 1 - 4 - Chemistry S-20ab Week 1 An Introduction to...

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Chemistry S-20ab Week 1 52 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: H 3 C CH 3 + H Br Reading : Section 4.7
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Chemistry S-20ab Week 1 53 Regioselectivity: “Markovnikov ! s Rule” Now consider the following reaction. Can you predict what will happen? H 3 C + H Br CH 3 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 additions to alkenes? 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
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Week 1 54 The Stability of Carbocations The relative stability of carbocations exhibits the following trend: H C H H H C H CH 3 CH 3 C H CH 3 CH 3 C H 3 C CH 3 < < < How can we explain this trend? Here are two other examples of “carbocations.” Can you make any statement about their stability, relative to the carbocations above (and relative to each other)? CH
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week 1 - 4 - Chemistry S-20ab Week 1 An Introduction to...

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