Ir(NHC)2Cl catalysts are synthesized from [Ir(COE)2Cl]2 and NHC-Ph ligands (Ph = mesityl and 1,3,5-trimethyphenyl) in the presence of tBuOK. The catalysts are used in the catalytic hydrogenolysis of various carbamate substrates using D-glucose as an alternative and renewable H2 donor. Catalytic hydrogenolysis of benzyl carbamate cleanly forms benzyl alcohol as the only product by 1H NMR spectroscopy, indicating a selective cleavage of the ester C-O band in the carbamate structure. Other carbamates containing different steric and electronic properties are later employed. The reactivity of carbamates is greatly dependent on their steric hindrance. Sterically hindered carbamates such as benzyl diethylcarbamate and methoxybenzyl diethycarbamate exhibit slower rate of reactions than carbamates containing smaller substitutents (ethyl dimethyl carbamate)

Green C-O bond hydrogenolysis of carbamates using D-glucose as alternative and renewable H2 donor

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