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Your search keyword '"Siu-Man Ng"' showing total 2 results
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2 results on '"Siu-Man Ng"'

1. Coupling reactions of CO2 with neat epoxides catalyzed by PPN salts to yield cyclic carbonates

Author

Wing Nga Sit, Siu Man Ng, Kar Yan Kwong, and Chak Po Lau

Subjects
Carbonates -- Chemical properties, Biological sciences, Chemistry
Abstract

A demonstration showing that the bis(triphenylphosphine)immium (PPN) manganese carbonyls and more interestingly the off-the-shelf reagent PPN(super +)Cl(super -) are good catalysts for the coupling reactions of CO2 with epoxides to yield cyclic carbonates is presented. The reactions are clean with no polycarbonate contamination and are performed in neat substrates with no need of organic solvents.

Published
2005

2. Dihydrogen-bond-promoted catalysis: catalytic hydration of nitriles with the indenylruthenium hydride complex (eta(super 5)-C9H7)Ru(dppm)H (dppm = Bis(diphenylphosphino)methane)

Author

Wai Kit Fung, Xin Huang, Man Lok Man, Siu Man Ng, Mei Yuen Hung, Zhenyang Lin, and Chak Po Lau

Subjects
Ruthenium -- Chemical properties, Hydrogen bonding -- Research, Nitriles -- Chemical properties, Chemistry
Abstract

The promotion of a catalytic reaction by the use of a M-H...H-X dihydrogen-bonding interaction in an indenylruthenium hydride system is discussed. The reaction barrier of (eta5-C9H7)Ru(dppm)H is lowered by the presence of a Ru-H...H-OH dihydrogen-bonding interaction in the transition state.

Published
2003

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