Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 348, Issue 1-2, Pages 93-100Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200505279
Keywords
allylic alcohol; ammonium ligands; isomerization, recycling; ruthenium; water-soluble
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The water-soluble complexes [RuCl2(eta(6)-p-cymene){kappa-(P)-PPh3-n(OCH2CH2NMe3)(n)}][SbF6](n) [n = 1 (4a), 2 (4b) or 3 (4c)] have been prepared from the neutral precursors [RuCl2(eta(6)-p-cymene){kappa-(P)-PPh3-n(OCH2CH2NMe2)(n)}] [n = 1 (2a), 2 (2b) or 3 (2c)] and MeI via quaternization of the nitrogen atom of the terminal aminoalkyl groups, and subsequent counteranion exchange by the treatment with AgSbF6. Complexes 2a-c and 4a-c have proven to be highly active catalysts for isomerization of allylic alcohols in THF and aqueous media, respectively. Moreover, the water-soluble catalysts 4a-c can be reused after a simple extraction process at the end of the reaction. In particular, 4c presents a remarkable capability to be recycled, being active during 10 successive runs.
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