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- W1550056692 abstract "Abstract Ruthenium complexes [Ru(CO) 2 (PPh 3 ) 2 (O 2 CR) 2 ] – 3a (R = CH 2 OCH 3 ), 3b (R = i Pr), 3c (R = t Bu), 3d (R = 2‐ c C 4 H 3 O), and 3e (R = Ph) – were synthesized by treatment of Ru(CO) 3 (PPh 3 ) 2 with the corresponding carboxylic acids. The molecular structures of the newly synthesized complexes in the solid state are discussed. Compounds 3a – e were successfully applied as catalysts in the addition of carboxylic acids to propargylic alcohols to give the corresponding β‐oxo esters in good to excellent yields even in air. The different carboxylate ligands do not have an influence on the productivities, because the carboxylates exchange rapidly under the applied reaction conditions, as was confirmed by 31 P{ 1 H} NMR spectroscopic studies. The addition of catalytic amounts of Na 2 CO 3 resulted in an increase in β‐oxo ester formation. The reaction is tolerant to the use of versatile functional groups on the propargylic alcohols and carboxylic acids, revealing a broad substrate generality. In contrast to most other known catalytic systems, even sterically hindered substrates, including 2,4,6‐trimethylbenzoic acid, 1,1‐diphenylprop‐2‐yn‐1‐ol, or the biologically active steroid ethisterone, were successfully converted." @default.
- W1550056692 created "2016-06-24" @default.
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- W1550056692 date "2015-04-27" @default.
- W1550056692 modified "2023-10-16" @default.
- W1550056692 title "Ruthenium Carboxylate Complexes as Efficient Catalysts for the Addition of Carboxylic Acids to Propargylic Alcohols" @default.
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- W1550056692 doi "https://doi.org/10.1002/ejic.201500203" @default.
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