Carbon monoxide reactions with

The mechanism is well understood, involving complexation of the rhodium with iodine and carbon monoxide, reaction with methyl iodide (formed from the methanol with hydrogen iodide), insertion of CO in the rhodium-carbon bond, and hydrolysis to give product with regeneration of the complex and more hydrogen iodide. 

Senanayake SD, Soon A, Kohlmeyer A, Sohnel T, Idriss H, (2005) Carbon monoxide reaction with UO fl 11) single crystal surfaces A theoretical and experimental study. J Vac Sci Technol... 

The role of siroheme in the reduction of nitrite is supported by the observation that nitrite perturbs the spectrum of the oxidized or reduced enzyme. Carbon monoxide reaction with the reduced siroheme can be followed spec-trophotometrically. The complex can be dissociated with oxygen. The kinetics of CO-complex formation and dissociation correspond with those for CO inhibition of nitrite reductase. The inhibition of nitrite reductase by p-chloromercuribenzoate, phenyl mercury acetate, and sodium mersalyl demonstrate the involvement of SH groups presumably associated with cysteine residues found in nitrite reductase. Epr studies and spectral data indicate the oxidation/reduction of iron sulfur centers and the formation of a NO-heme complex however, other intermediates have not been confirmed (Aparicio et al., 1975 Vega and Kamin, 1977 Hucklesby et al., 1979). 

Several consecutive runs were made in which the reactor was first contacted with carbon monoxide (until no further reactions occurred) and then with hydrogen (to remove all carbon from the surface). As a result of these treatments, little or no surface oxides were present on the walls of the reactor, and carbon monoxide reacted only by disproportionation. Preliminary evidence indicates that carbon monoxide reactions with the reduced (or at least partially reduced) surfaces were as fast if got more so than with the more oxidized surfaces at 700°, 800°, and probably also 900°C. 

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