Synthesis, reactions and catalytic activities of iridium complexes intercalated into montmorillonite
- 1 January 1993
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 4,p. 581-585
- https://doi.org/10.1039/dt9930000581
Abstract
Reactions of cationic iridium(I) complexes, [Ir(cod)(PPh3)2]ClO41 and [Ir(cod)(PPh3)(PhCN)]ClO42(cod = cycloocta-1,5-diene) with water-swelled sodium montmorillonite have been shown to produce iridium complex-intercalated clays, [Ir(cod)(PPh3)2]+–montmorillonite 1c and [Ir(cod)(PPh3)-(PhCN)]+–montmorillonite 2c. Compounds 1c and 2c react with CO to produce [Ir(CO)x(PPh3)2]+(from 1c) and [Ir(CO)y(PPh3)]+(from 2c) intercalated clays. Reactions of 1c and 2c with H2 produce cyclooctane and unknown iridium complexes remaining in the layers of the clay. While both the catalytic hydrogenation and isomerization (double-bond migration and cis–trans conversion) of olefins with 1 and 2 are in general retarded by intercalation of the catalysts, isomerization is relatively more suppressed than hydrogenation. Selective hydrogenation of the vinyl group of 4-vinylcyclohexene was found to be somewhat higher with 1c than with 1.Keywords
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