An approach has been developed to determine the regioselectivity of hydrometalation in homogeneous and heterogeneous hydrogenation of alkenes. By studying the electronic effects on the orientation of hydrometalation it is found with palladium and rhodium that this key step is a two electron process
Structural properties of the nickel ions in urease: novel insights into the catalytic and inhibition mechanisms
β Scribed by Stefano Ciurli; Stefano Benini; Wojciech R. Rypniewski; Keith S. Wilson; Silvia Miletti; Stefano Mangani
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 472 KB
- Volume
- 190-192
- Category
- Article
- ISSN
- 0010-8545
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β¦ Synopsis
relationships between the structural features of the Ni-containing active site and the physico-chemical and biochemical properties of this metallo-enzyme. In addition, the recently determined structure of a complex between urease and a transition state analogue is discussed as it leads to a novel, thought-provoking proposal for the enzyme mechanism.
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Four novel dioxidomolybdenum(VI) complexes [MoO 2 (L x )-(CH 3 OH)] have been synthesized, using 2[(E)-(2-hydroxy-2phenylethylimino)methyl]phenol derivatives as tridentate ONO donor Schiff base ligands (H 2 L x ) and MoO 2 (acac) 2 . A monoclinic space group was determined by X-ray crystallography f