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The decarbonylation of aldehydes with stoichiometric amounts of [RhCl(PPh3)3] was

reported by

Tsuji and Ohno in 1965. The reaction proceeds at around room

temperature and generates trans-[RhCl(CO)(PPh3)2]. The chemical equation for

decarbonylation is shown below:

Propose the reaction mechanism for the above reaction. For each step in the

mechanism, name the reaction involved. You should also determine the oxidation

state of the metal, the electron count and the geometry of all the intermediates involved.

Note that migratory extrusion of CO (the reverse of migratory insertion) from a

coordinated acyl group is the rate-determining step.

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