Ether–phosphines | An-Najah Staff

Synthesis and Characterization of 1,3-Diamine(Phosphine)-Ruthenium(Ii) Complexes Using Monodentate and Bidentate Phosphine Ligands

Mon, 2013-04-15 17:13 — Ismail Warad

Journal Title, Volume, Page:

Journal of Saudi Chemical Society, Vol. 11, No. 1; pp. 15-24 (2007)

Year of Publication:

2007

Link:

http://faculty.ksu.edu.sa/73826/Documents/16.pdf

Authors:

Ismail Warad

Department of Chemistry, Science College, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Preferred Abstract (Original):

The neutral Ru(II), chelating phosphine or diphosphine with 1,3-diamine (1,3-diamino-2-propanol) of type [RuCl2(PP)(NN)], are readily synthesized in very good yields at an inert atmosphere using dichloromethane as solvent. For the first time, the ruthenium(II) complexes: [trans-dichloro-(bis(triphenylphosphine)(1,3-diamino-2-propanol)ruthenium(II)] (2), [trans-dichloro(1,3-bis(diphenyl-phosphino)propane)(1,3-diamino-2-propanol)ruthenium(II)] (4) and [trans-dichloro(bis(ether-phosphine)-(1,3-diamino-2-propanol)ruthenium(II)] (6) have been prepared at room temperature starting from [RuCl2(PPh3)3],[RuCl2(Ph2PCH2CH2OCH3)2] and [RuCl2(dppp)2], respectively. Trans-RuCl2 with nitrogen atoms are trans to phosphorus atoms are structurally favored (kinetic) isomer. This structural phenomenon has been monitored by 31P{1H} NMR in CD2Cl2. All the mentioned complexes were fully characterized by NMR, IR, and FAB-MS as well as elemental analysis.

Supported Organometallic Complexes Part 34: Synthesis and Structures of An Array of Diamine(Ether–Phosphine)Ruthenium(II) Complexes and Their Application In The Catalytic Hydrogenation of Trans-4-Phenyl-3-Butene-2-One

Wed, 2013-03-13 17:09 — Ismail Warad

Journal Title, Volume, Page:

Inorganica Chimica Acta Volume 350, 4 July 2003, Pages 49–56

Year of Publication:

2003

Link:

http://www.sciencedirect.com/science/article/pii/S0020169302015359

Authors:

Ekkehard Lindner

Institut für Anorganische Chemie der Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany

[email protected]

Ismail Warad

Institut für Anorganische Chemie der Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Klaus Eichele

Institut für Anorganische Chemie der Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany

Hermann A Mayer

Institut für Anorganische Chemie der Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany

Preferred Abstract (Original):

The novel diamine–bis(ether–phosphine)ruthenium(II) complexes Cl2Ru(η1-Ph2PCH2 CH2OCH3)2(diamine)2(3L1–3L11) have been obtained by reaction of equimolar amounts of Cl2Ru(P∩O)2 (2) with the respective diamines L1–L11 in good yields. X-ray structural investigations of 3L2 and 3L8 show monoclinic unit cells with the space group P21/c. The octahedrally coordinated ruthenium atoms have each two trans-chlorides and cis-phosphines which is in agreement with NMR studies in solution. With the exception of 3L4 all mentioned ruthenium complexes are highly catalytically active in the hydrogenation of the α,β-unsaturated ketone trans-4-phenyl-3-butene-2-one. In most cases the conversions and selectivities toward the formation of the unsaturated alcohol trans-4-phenyl-3-butene-2-ol were 100% with high turnover frequencies under mild conditions. Novel diamine–bis(ether–phosphine)ruthenium(II) complexes have been prepared and characterized. X-ray structural investigations of 3L2 and 3L8 show monoclinic unit cells with the space group P21/c. These complexes are highly catalytically active in the hydrogenation of an α,β-unsaturated ketone, with excellent conversions and selectivities under mild conditions.