Herein a non-precious transition-metal catalyst system for the selective synthesis of dialkoxymethane ethers from carbon dioxide and molecular hydrogen is presented. The development of a tailored catalyst system based on cobalt salts in combination with selected Triphos ligands and acidic co-catalysts enabled a synthetic pathway, avoiding the oxidation of methanol to attain the formaldehyde level of the central CH unit. This unprecedented productivity based on the molecular cobalt catalyst is the first example of a non-precious transition-metal system for this transformation utilizing renewable carbon dioxide sources.
The direct hydrogenation
of carbon dioxide to methanol represents
a challenging transformation for molecular catalyst, and only a few
systems facilitate this reaction. Herein, molecular complexes based
on the tridentate tdppcy ligand are described, enabling the variable
synthesis of structurally tailored catalytic systems. In combination
with selected ruthenium precursors and suitable cocatalysts the direct
hydrogenation of carbon dioxide could be demonstrated with unprecedented
activity. Moreover, the versatile catalyst allowed the reaction in
two-phase systems, paving the way to adapted reaction concepts for
the utilization of the renewable carbon source carbon dioxide.
Herein a highly active non-precious transition metal catalyst for the homogeneous hydrogenation of carbon dioxide to formate is presented. Detailed ligand optimisation enabled the development of a nickel-based catalytic system with exceptional productivity.
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