This LO discuss various aspects of a reversible hydrogen activation by a metal-free phosphonium-borate compound. Attentions are paid to the specific and usual reaction between highly steric phosphine and borane reactants to form a zwitterionic phosphonium borate product. NMR spectroscopy, kinetics and thermodynamics of the hydrogen activation with the phosphonium borate product are also discussed. The original work was published in Science by Douglas W. Stephan and co-workers.
This LO is part of a special VIPEr collection honoring the 2022 ACS National Award recipients in the field of inorganic chemistry. Douglas W. Stephan was the recipient of the F. Albert Cotton Award in Synthetic Inorganic Chemistry.
Students should be able to:
a) Rationalize the steric effect on the chemical and physical properties of the compounds
b) Sketch a qualitative 19F NMR spectrum of a small molecule
c) Identify reaction intermediates and mechanism of a chemical reaction
d) Perform a calculation to determine the enthalpy and the entropy of activation from the Eyring Plot
This LO was written as part of a collection for the 2022 ACS award winners. It has not been implemented in classroom.