C-scorpionate iron(II) complexes as highly selective catalysts for the hydrocarboxylation of cyclohexane

Add time:07/23/2019    Source:sciencedirect.com

The C-scorpionate iron(II) complexes [FeCl2{κ3-HC(pz)3}] (1) (pz = pyrazol-1-yl), Li[FeCl2{κ3-SO3C(pz)3}] (2) and the new [FeCl2{κ3-HOCH2C(pz)3}] (3) act as catalysts for the hydrocarboxylation of cyclohexane (with CO and H2O) to cyclohexanecarboxylic acid in a remarkable yield (up to 60%) and under mild conditions. The catalysts selectivity for the acid can be tuned by CO pressure, catalyst amount and reaction temperature. Complex [FeCl2{κ3-HC(pz)3}] (1) provides the most effective catalyst requiring low CO pressure. This work constitutes an unprecedented use of iron complexes as catalysts for the hydrocarboxylation of alkanes.

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