final exam - ANSWER KEY CHEM 4571 Organometallic Chemistry...

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CHEM 4571 - Organometallic ChemistryANSWER KEYFINAL EXAM -- May 2008 1. (50 pts)Bergman and coworkers reported the following transformation (JACS, 2002, 124, 4192-4193) that was also presented in your notes: RhNH3CMe3P*CCH3+ HSiPh3RhCH3CMe3P*NSiPh3+CH4a) (35 pts) Shown below is a hypothetical catalytic cycle to transform acetonitrile (NCCH3) and HSiPh3into the silyl-substituted isocyanide (CNSiPh3) and CH4. Label the forward steps (going clockwise) in the catalytic cycle using the boxes provided. There may be more than step per box – if the order is important label the steps 1) and 2), otherwise don’t number the steps.Check this box if you want your graded test put out in the public boxes outside Prof. Stanley’s office:
Organometallics Final Exam – 2008 b) (5 pts)The last ligand substitution step in the cycle (perhaps the simplest step) is very unlikely to occur and keeps this from being a real catalytic reaction. Clearly discuss why this step is unlikely to happen. 2
c) (5 pts)What other step in the catalytic cycle is rather unusual and difficult? Clearly discuss.

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