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2 results on '"Changguang Yao"'

1. Interrogating the steric outcome during H2 heterolysis: in-plane steric effects in the regioselective protonation of the PN3P-pincer ligand

Author

Chunhui Zhou, Changguang Yao, Kuo-Wei Huang, and Tonghuan Zhang

Subjects
Steric effects, 010405 organic chemistry, Ligand, chemistry.chemical_element, Regioselectivity, Protonation, 010402 general chemistry, 01 natural sciences, Heterolysis, Medicinal chemistry, 0104 chemical sciences, Inorganic Chemistry, Nickel, In plane, chemistry, Pincer ligand
Abstract

H2 heterolysis to generate well-defined nickel hydride-proton complexes was achieved by the 2nd generation PN3P-pincer nickel platform. The regioselective protonation in the ligand framework was demonstrated for the first time to highlight the importance of in-plane hindrance during the H2 splitting process.

Published
2019

2. Monomeric nickel hydroxide stabilized by a sterically demanding phosphorus–nitrogen PN3P-pincer ligand: synthesis, reactivity and catalysis

Author

Lan-Chang Liang, Emanuele Aresu, Huaifeng Li, Chao Guan, Chunhui Zhou, Priyanka Chakraborty, Kuo-Wei Huang, and Changguang Yao

Subjects
Nitrile, 010405 organic chemistry, Ligand, Aryl, chemistry.chemical_element, 010402 general chemistry, 01 natural sciences, Medicinal chemistry, 0104 chemical sciences, Inorganic Chemistry, Nickel, chemistry.chemical_compound, chemistry, Nucleophile, Hydroxide, Reactivity (chemistry), Pincer ligand
Abstract

A terminal nickel hydroxide complex (PN3P)Ni(OH) (3) bearing the 2nd generation phosphorus–nitrogen PN3P-pincer ligand has been synthesized and structurally characterized. As a nucleophile, 3 reacts with CO to afford the hydroxycarbonyl complex 4, (PN3P)Ni(COOH). 3 can also activate CO2 and CS2 to produce nickel bicarbonate (PN3P)Ni(OCOOH) (5) and bimetallic dithiocarbonate [(PN3P)NiS]2CO (6) respectively, as well as to promote aryl isocyanate and isothiocyanate insertion into the Ni–OH bond to give the corresponding (PN3P)NiEC(O)NHAr complexes (E = O, 7; E = S, 8). In addition, 3 catalyzes the nitrile hydration to various amides with well-defined intermediates (PN3P)Ni–NHC(O)R (R = Me, 9; R = Ph, 10).

Published
2018

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