(1,5-Cyclooctadiene)[1,4-bis(diphenylphosphino)butane]iridium(I) Tetrafluoroborate

[78036-20-1]  · C36H40BF4IrP2  · (1,5-Cyclooctadiene)[1,4-bis(diphenylphosphino)butane]iridium(I) Tetrafluoroborate  · (MW 813.685)

(reagent for hydrogenation;1 isomerization of butenyl- to allylsilanes2)

Physical Data: dec. on attempted melting.

Solubility: insol Et2O, pentane; sol CH2Cl2, MeOH, etc.

Form Supplied in: orange powder. Drying: used as supplied in anhydrous solvent.

Analysis of Reagent Purity: 31P NMR indicates presence of free phosphine ligand and phosphine oxides.

Handling, Storage, and Precautions: store under argon in freezer; stable as solid; solutions are air sensitive. This compound should be handled in a fume hood.

The complex has enjoyed relatively little use in organic synthesis. For iridium-catalyzed homogeneous hydrogenation of alkenes, Crabtree's iridium complex ((1,5-Cyclooctadiene)(tricyclohexylphosphine)(pyridine)iridium(I) Hexafluorophosphate) is generally preferred, although this readily prepared Ir complex is active.1 It is more reactive than its rhodium counterpart in the catalytic isomerization of butenyl- to allylsilanes.2

1. Brown, J. M.; Derome, A. E.; Hall, S. A. T 1985, 41, 4647.
2. Matsuda, I.; Kato, T.; Sato, S.; Izumi, Y. TL 1986, 27, 5747.

John M. Brown & James A. Ramsden

University of Oxford, UK

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