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Ru(dppbsa)-catalyzed hydrodeoxygenation and reductive etherification of ketones and aldehydes

Authors
  • Sun, Rui
  • guo, hon-yu
  • shuang-shuang, ma
  • wang, yao-feng
  • zheng-kun, yu
  • bao-hua, xu
Publication Date
Feb 14, 2022
Source
Institutional Repository of Institute of Process Engineering, CAS (IPE-IR)
Keywords
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Abstract

Methods for the Ru(dppbsa)-catalyzed hydrodeoxygenation and reductive etherification of ketones and aldehydes were developed. Carbonyl substrates without beta-CH functionality follow a hydrogenation-hydrogenolysis path, wherein the hydrogenolysis of the alkanol intermediates is the rate-limiting step. By contrast, a hydrogenation-dehydration-hydrogenation path is followed by carbonyl substrates with beta-CH functionality, suffering from rate-limiting sulfonate ligand-assisted reversible H-2 cleavage. This hydrodeoxygenation is competitive with reductive etherification when using alkanols as hydrogen surrogates. The chemoselectivity can be adjusted based not only on the bond strengths of O-H and C-H bonds in the alkanols but also on the steric hindrance of the carbonyl substrates. As a result, both hydrodeoxygenation and reductive etherification exhibit excellent aldehyde tolerance, while the reductive etherification of ketones is highly hindered based on this protocol.

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