Alkane Soluble Transition Metal Complexes.
Final rept. 15 Apr 79-6 Oct 83, Semiannual rept. no. 3, 7 Apr-6 Oct 83,
ROYAL MILITARY COLL OF SCIENCE SHRIVENHAM (ENGLAND) DEPT OF CHEMISTRY AND METALLURGY
Pagination or Media Count:
A series of tertiary phosphines and tertiary phosphine oxides containing long alkyl chains have been synthesized. As expected they are very soluble in non-polar solvents, particularly hydrocarbons. As a consequence it is difficult to separate these compounds from intermediates and by-products formed during their synthesis. Accordingly it is necessary to purify all the reactants and to use reactions that give a minimum of side products. The same remarks apply to the synthesis of the transition metal complexes of these ligands. The transition metal complexes of the tertiary phosphine ligands have been prepared with rhodiumI, palladiumO, palladiumII, platinumO and platinumII. All are very soluble in non-polar organic solvents. This extreme solubility modifies the catalyticproperties of these complexes in homogeneous solution, as demonstrated by the enhanced ratio of normal branched aldehyde formed in the hydroformylation of 1-hexene in the presence of RhC1COL2 when para-alkyl groups are present on the triarylphosphine L. The value of extreme solubility on the catalytic properties of the resulting complexes is particularly well demonstrated by the ability of the platinumII complexes PtL2C12 together with tinII chloride to promote the partial hydrogenation of the polyolefins methyl linoleate and methyl linolenate to the corresponding monoolefins wtih high selectivity.
- Organic Chemistry