Sustainable Catalytic System Research Articles

ChemInform Abstract: C(sp3)—H Functionalization of Methyl Azaarenes: A Calcium‐Catalyzed Facile Synthesis of (E)‐2‐Styryl Azaarenes and 2‐Aryl‐1,3‐bisazaarenes.

AbstractA mild, efficient, and sustainable catalytic system for the C(sp3)—H functionalization of methyl azaarenes is reported.

Production of ultra-deep sulfur-free diesels using a sustainable catalytic system based on UiO-66(Zr).

The porous metal-organic framework UiO-66(Zr) obtained via non modulated synthesis, has revealed to be a notable heterogeneous catalyst, enabling extremely fast and very efficient desulfurization of a multicomponent model diesel and also a real diesel fuel.

Simple metal salts supported on montmorillonite as recyclable catalysts for intramolecular hydroalkoxylation of double bonds in conventional and VOC-exempt solvents

We describe herein an efficient and particularly sustainable catalytic system for the intramolecular hydroalkoxylation of double bonds.

Carbon–Carbon Cross‐Coupling Reactions Catalyzed by a Two‐Coordinate Nickel(II)–Bis(amido) Complex via Observable NiI, NiII, and NiIII Intermediates

AbstractRecently, the development of more sustainable catalytic systems based on abundant first‐row metals, especially nickel, for cross‐coupling reactions has attracted significant interest. One of the key intermediates invoked in these reactions is a NiIII–alkyl species, but no such species that is part of a competent catalytic cycle has yet been isolated. Herein, we report a carbon–carbon cross‐coupling system based on a two‐coordinate NiII–bis(amido) complex in which a NiIII–alkyl species can be isolated and fully characterized. This study details compelling experimental evidence of the role played by this NiIII–alkyl species as well as those of other key NiI and NiII intermediates. The catalytic cycle described herein is also one of the first examples of a two‐coordinate complex that competently catalyzes an organic transformation, potentially leading to a new class of catalysts based on the unique ability of first‐row transition metals to accommodate two‐coordinate complexes.

Carbon-carbon cross-coupling reactions catalyzed by a two-coordinate nickel(II)-bis(amido) complex via observable Ni(I) , Ni(II) , and Ni(III) intermediates.

Recently, the development of more sustainable catalytic systems based on abundant first-row metals, especially nickel, for cross-coupling reactions has attracted significant interest. One of the key intermediates invoked in these reactions is a Ni(III) -alkyl species, but no such species that is part of a competent catalytic cycle has yet been isolated. Herein, we report a carbon-carbon cross-coupling system based on a two-coordinate Ni(II) -bis(amido) complex in which a Ni(III) -alkyl species can be isolated and fully characterized. This study details compelling experimental evidence of the role played by this Ni(III) -alkyl species as well as those of other key Ni(I) and Ni(II) intermediates. The catalytic cycle described herein is also one of the first examples of a two-coordinate complex that competently catalyzes an organic transformation, potentially leading to a new class of catalysts based on the unique ability of first-row transition metals to accommodate two-coordinate complexes.

Protic ionic liquids: A highly efficient catalyst for synthesis of cyclic carbonate from carbon dioxide and epoxides

An efficient, inexpensive, easily prepared and sustainable catalytic system of protic ionic liquids was developed for cycloaddition of CO2 and epoxides to produce cyclic carbonates without using any co-catalyst and organic solvent. The effects of the acidity and structure of protic ionic liquid on the catalytic performance were investigated and the various reaction conditions were optimized. Notably, this catalyst was used for five times at least without appreciable loss of catalytic activity and applied for various epoxide for synthesis of corresponding cyclic carbonate in high selectivity and yield. Additionally, a mechanism for the synergistic effects of cation and anion in protic ionic liquids was also proposed.