Mechanism

2052's picture

Kinetics and Mechanism of Osmium(VIII)-Catalyzed Oxidation of Thiomorpholine by Alkaline Hexacyanoferrate(III)

Journal Title, Volume, Page: 
Journal of Applied Sciences, 2002, Volume: 2, Issue: 7, Page No.: 742-746, DOI: 10.3923/jas.2002.742.746
Year of Publication: 
2002
Authors: 
Mohammed M. Al Subu
Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Biomedical Sciences, Faculty of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine
Preferred Abstract (Original): 

Thiomorpholine (tetrahydro-1,4-thiazine), in the presence of Os(VIII) as catalyst, is oxidized by alkaline hexacyanoferrate(III) to 2-hydroxythiomorpholine. There is a first-order dependence in [Fe(CN)63-] and [Os(VIII)] and zero-order dependence in [thiomorpholine] and [OH-]. The observed rate constant was dependent on [Fe(CN)64-] the type of electrolyte and the permitivitty of the reaction medium (10-40% ethanol). The proposed mechanism includes the formation of a transient [OsO4(OH)2 ]2--thiomorpholine complex prior to the rate-determining regeneration of OsVIII by [Fe(CN)63-]. The values of the enthalpy and entropy of activation are calculated from rate constant values measured at different temperatures (20-40 ° C).

Hikmat S. Hilal's picture

Short Communication: The Mechanism of 1- Octene Isomerization and Hydrosilylation Reaction Catalysed by Ru3(CO)12

Journal Title, Volume, Page: 
An-Najah J. Res., Vol. II, No. 8, P:175-183
Year of Publication: 
1994
Authors: 
Hikmat S. Hilal
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Current Affiliation: 
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Waheed Jondi
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Shukri Khalaf
Department of Chemistry, An-Najah N. University, Nablus, PO Box 7, West Bank, Palestine
Preferred Abstract (Original): 

Isomerization and hydrosilylation reactions of terminal olefins have been reported under thermal and photochemical conditions using Ru3 (C0) 12, 1, and HRu3 (CO)!!, 2,11 '0 In a very recent work, we reported E LI that 1 catalyses both Isomerization and hydrosilylation reactions of 1-octene (eq. 1). It has been found that the isomerization reaction occurs via lower nuclearity catalytic species that result from fragmentation of the mother cluster 1. Evidence in favour of concurrent cluster catalysis was also reported. On the other hand, the hydrosilylation reaction occurred via cluster catalysis at first and after some-time fragment catalysis occurred.

see the full file here

Syndicate content