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

The C-scorpionate iron(II) complexes [FeCl2{kappa(3)-HC(pz)(3)}](1) (pz = pyrazol-1-yl), Li[FeCl2{kappa(3)-SO3C(pz)(3)}] (2) and the new [FeCl2{kappa(3)-HOCH2C(pz)(3)}] (3) act as catalysts for the hydrocarboxylation of cyclohexane (with CO and H2O) to cyclohexanecarboxylic acid in a remarkable yiel...

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Bibliographic Details
Main Author: Matias, Inês (author)
Other Authors: Da Costa Ribeiro, Ana Paula (author), Alegria, Elisabete (author), Pombeiro, Armando (author), Martins, Luisa (author)
Format: article
Language:eng
Published: 2019
Subjects:
Hydrocarboxylation
Iron
Scorpionate
Homogeneous catalysis
Aqueous medium
Cyclohexane
Carboxylic acid
Online Access:http://hdl.handle.net/10400.21/9923
Country:Portugal
Oai:oai:repositorio.ipl.pt:10400.21/9923
Description
Summary:The C-scorpionate iron(II) complexes [FeCl2{kappa(3)-HC(pz)(3)}](1) (pz = pyrazol-1-yl), Li[FeCl2{kappa(3)-SO3C(pz)(3)}] (2) and the new [FeCl2{kappa(3)-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{kappa(3)-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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