Mononuclear η6-p-cymeneosmium(II) complexes and their reactions with Al2Me6and other methylating reagents
- 1 January 1985
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 3,p. 573-578
- https://doi.org/10.1039/dt9850000573
Abstract
An improved-yield synthesis of the η6-p-cymeneosmium(II) chloride complex [(p-MeC6H4CHMe2)2Os2Cl4](1) has allowed the development of the chemistry of the mononuclear complexes, [(p-MeC6H4CHMe2)OsLCl2](2)[L = CO, CNCMe3, Me2SO, PMe3, PPh3, or P(OPh)3]. These gave [(p-MeC6H4CHMe2)OsL(Me)Cl](3)(L = CO, CNCMe3, Me2SO, or PMe3) with Al2Me6. Reaction of [(p-MeC6H4CHMe2)Os(Me2SO)(Me)Cl] with L′[PPh3 or P(OPh)3] gave the complex [(p-MeC6H4CHMe2)OsL′(Me)Cl]. Al2Me6 reacted with [(p-MeC6H4CHMe2)OsL′Cl2] to give chiefly the ortho-metallated complexes [(p-MeC6H4CHMe2)Os{PPh2(o-C6H4)}X](5)(X = Cl), (6)(X = Me), and [(p-MeC6H4CHMe2)Os{P(OPh)(OC6H4-o)2}](8); however, the triphenylphosphine complex also gave the mono- and the di-methyl complexes [(p-MeC6H4CHMe2)Os(PPh3)(Me)X](X = Cl or Me). The complexes have been characterised by their i.r., 1H, 13C, and 31P n.m.r. spectra and their e.i. mass spectra. The p-cymene ring remains η6-bonded throughout these reactions and appears quite difficult to displace.Keywords
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