Freshman Organic Chemistry II (CHEM 125B)
Alkenes may be oxidized to diols by permanganate or by OsO4 catalysis. Metal catalysts provide orbitals that allow simultaneous formation of two bonds from metal to alkene or H2. Coupling such oxidative additions to reductive eliminations, provides a low-energy catalytic path for addition of H2 to an alkene. Such catalytic hydrogenation is often said to involve syn stereochemistry, but the primary literature shows that addition can be anti when allylic rearrangement occurs on the catalyst. Similar oxidative/reductive cycles operate in olefin metathesis and metal-catalyzed polymerization. Careful catalyst design allows control over polymer stereochemistry (tacticity). Polymerizations catalyzed by free-radicals or acids typically lack stereochemical control, but there are ways to control regiochemistry and chain length. Latex, a natural polymer, coagulates to form a rubber ball.
00:00 - Chapter 1. Alkene Dihydroxylation
04:28 - Chapter 2. Catalytic Hydrogenation of Alkenes: Oxidative Addition, Reductive Elimination
15:08 - Chapter 3. Catalytic Hydrogenation of Alkenes: Stereochemistry
25:50 - Chapter 4. Olefin Metathesis, Polymerization, and Tacticity
39:00 - Chapter 5. Radical Polymerization
43:16 - Chapter 6. Electrophilic Oligomerization and Polymerization and Rubber
Complete course materials are available at the Open Yale Courses website: http://oyc.yale.edu
This course was recorded in Spring 2011.
Tagged under: alkene dihydroxylation,catalytic hydrogenation,oxidative addition,reductive elimination,olefin metathesis,Grubbs catalyst,ROMP,Ziegler-Natta catalyst,tacticity,Kaminsky catalyst,dispersity,radical polymerization,oligomerization,latex,rubber
Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.
Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip
Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans
1. Students enter a simple code
2. You play the video
3. The students comment
4. You review and reflect
* Whiteboard required for teacher-paced activities
With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.
Carry out a quickfire formative assessment to see what the whole class is thinking
Create interactive presentations to spark creativity in class
Student teams can create and share collaborative presentations from linked devices
Turn any public video into a live chat with questions and quizzes