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Mechanism of Iridium Catalysed Reaction

 

The Iridium Cyle

click below to see the cyle build up step by step

 

 

 

 

 

 

 

 

 

 

The promotor must be intervening to speed up the slower steps of the cycle.

 

The addition of iodomethane to iriduium (step 1) is about 150 times faster than addition to rhodium.

Question

a) Watch the cycle carefully. Is the first step still rate determining?

b) The observed overall rate law is

Rate = [catalyst] x [CO]
                       [I-]


Explain why this is consistent with what you noticed about the cycle.

c) Sketch the energy profile you would expect for the first two steps of the iridium cycle.

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