'Cyclic bromonium ion' presentation slideshows

Chapter 4

Chapter 4. Reaction of Alkenes. Electrophilic addition to an alkene. slow. fast. Electrophilic addition of a hydrogen halide to a symmetrical alkene. Electrophilic addition of a hydrogen chloride to an asymmetrical alkene. Why?. Stabilization of a carbocation by hyperconjugation.

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Addition of Br 2 and Cl 2

Addition of Br 2 and Cl 2. Stereochemistry. Anti Addition (halogens enter on opposite sides) ; Stereoselective Syn addition (on same side) does not occur for this reaction. Mechanism, Step 1. Step 1, formation of cyclic bromonium ion. Step 2. Detailed Stereochemistry, addition of Br 2.

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Chemistry

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Formation of glycols with Syn Addition

Formation of glycols with Syn Addition. Osmium tetroxide. Syn addition. also. KMnO 4. Anti glycols. Using a peracid, RCO 3 H, to form an epoxide which is opened by aq. acid. epoxide. The protonated epoxide is analagous to the cyclic bromonium ion. Peracid: for example, perbenzoic acid.

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6.14 Addition of Halogens to Alkenes

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CHE-240 Unit 3

CHE-240 Unit 3. Physical and Chemical Properties and Reactions of Alkenes and Alkynes CHAPTER EIGHT TERRENCE P. SHERLOCK BURLINGTON COUNTY COLLEGE 2004. Reactivity of C=C. Electrons in pi bond are loosely held. Electrophiles are attracted to the pi electrons.

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