Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 326, Issue 1-2, Pages 15-20Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2010.05.003
Keywords
Allylic alcohols; Redox isomerization; Phosphate coordination; Ruthenium; Methyl-PTA
Categories
Funding
- Junta de Andalucia through PAI [FQM-317, FQM-03092]
- MCYT (Spain) [CTQ2006-06552/BQU]
- Hungarian-Spanish Intergovernmental Collaboration in Science and Technology [TeT E-10/2005: HH2005-0001]
- Hungarian National Research and Technology Office - National Research Fund [NKTH-OTKA K 68482, OTKA IN 78040]
- Gobierno Autonomo de Canarias
- Hungarian Ministry of Education for a Bekesy Gyorgy
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In aqueous solutions at 80 degrees C, [RuClCp(mPTA)(2)](OSO2CF3)(2) (1) and [RuCp(mPTA)(2)(OH2 kappa O)1(OSO2CF3)(3)center dot(H2O)(C4H10O)(0.5) (3) (mPTA: N-methyl-PTA) were found effective catalysts of the redox isomerization of alk-1-en-3-ols to the corresponding ketones, characterized by initial turnover frequencies (TOF) of 162 h(-1) (3) and 9.6 h(-1) (1) in 1-octen-3-ol isomerization. A sharp maximum of the reaction rate as a function of pH was observed with 1 in phosphate buffer solutions. Kinetic and P-31 NMR measurements revealed for the first time in aqueous organometallic catalysis that component(s) of phosphate buffer (most probably HPO42-) strongly interact(s) with the catalyst complexes and this interaction leads to a dramatic loss of the catalytic activity. (C) 2010 Elsevier B.V. All rights reserved.
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