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Synthesis of PEG–iridium conjugates and their use as hydrogenation catalysts in a water/substrate two-phase medium |
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| Authors: | Jennifer A Loch Cornelia Borgmann Robert H Crabtree |
| Institution: | Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT 06520-8107, USA |
| Abstract: | New syntheses of PEG-(OCH2C5H4N)2 and PEG-(OC6H4PPh2)2 (PEG: poly(ethylene glycol)) conjugates are reported. An iridium hydrogenation catalyst 1, is shown to catalyze hydrogenation in a water/substrate two-phase system. Attachment of 1 to PEG to make 2 and 3 succeeds in making the complex water-soluble and allows it to retain some of its catalytic ability, but leads to micelle formation that inhibits the separation of organic and aqueous phases. |
| Keywords: | PEG–iridium conjugates Conjugates Catalyst Two-phase catalysis |
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