Issue 14, 1992

Phosphinobenzyl- and aryl-silanes and their triosmium cluster carbonyl derivatives

Abstract

The Grignard reagents MgR(Br)(R = C6H4CH2SiMe2H-o or C6H4CH2SiMeH2-o) have been found to undergo unusual reactions with Ph2PCl to afford o-Ph2PC6H4CH2SiMe2H I and o-HMe2SiC6H4CH2PPh2II and o-Ph2PC6H4CH2SiMeH2III and o-H2MeSiC6H4PPh2IV respectively. Reactions of the respective bidentate ligands I, II, III and IV with [Os3(CO)10(MeCN)2] gave the novel triosmium cluster [Os3(µ-H)(CO)10(L–L)]1, 2, 3 and 4 involving cleavage of one Si–H bond. Similar reactions of ligands II and IV with [Os3(µ-H)2(CO)10] afforded two new clusters [Os3(µ-H)3(CO)8(L–L)]5 and 6 respectively. The structures of 1, 2, 4 and 5 have been determined by single-crystal X-ray diffraction techniques. In each case, the ligand assumes a chelating mode across the long edge of the osmium triangle which is also bridged by a hydride. The high-performance liquid chromatographic behaviour of these clusters has also been determined and correlated with the size and nature of the ligands.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1992, 2161-2169

Phosphinobenzyl- and aryl-silanes and their triosmium cluster carbonyl derivatives

H. G. Ang, B. Chang and W. L. Kwik, J. Chem. Soc., Dalton Trans., 1992, 2161 DOI: 10.1039/DT9920002161

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