- Cationic ruthenium complex of the formula [RuCl(2,6-diacetylpyridine)(PPh3)2]BArF and its catalytic activity in the formation of enol esters
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A new ruthenium 2,6-diacetylpyridine complex was synthesized and applied in the atom-economic synthesis of enol esters through Markovnikov-directed addition of carboxylic acids to terminal alkynes. The ruthenium complex [RuCl(dap)(PPh3)2]+BArF? was synthesized from [RuCl2(PPh3)2] and the corresponding ligand 2,6-diacetylpyridine (dap). The complex was characterized structurally. The new ruthenium complex was utilized under ambient conditions as a catalyst in the Markovnikov addition of carboxylic acids to terminal alkynes to afford the corresponding enol esters in 93% to 52% isolated yields (85 °C, 16 h reaction time, 1 mol% catalyst loading).
- Stark, Matthew J.,Tang, Douglas T.,Rath, Nigam P.,Bauer, Eike B.
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supporting information
p. 873 - 877
(2018/02/09)
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- Control over C-O and C-C bond formation: ruthenium catalyzed regiospecific addition of carboxylic acid to alkyne and stereoselective dimerization of alkyne
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A cationic ruthenium(II) complex, [Ru(PPh3)2(CH3CN)3Cl][BPh4] (1), has been found to be an effective catalyst for stereoselective dimerization of alkynes in the presence of a base, and for regiospecific addition of carboxylic acids to alkynes in presence of the Lewis acid, BF3·Et2O.
- Tripathy, Jyotsna,Bhattacharjee, Manish
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supporting information; body text
p. 4863 - 4865
(2009/11/30)
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- Mecanisme d'acetolyse d'esters d'enol styreniques
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We have studied the reaction of enol esters in acidic media: wherein Z = H, CH3, CH2Cl, CHCl2 and CCl3.The raction is first order.Log kex = α H'0 + β (H'0 = acidity function of Hammett) with α-1.A general acid catalysis is observed.Following a discussion of possible SN, AAC2 and ASE2 mechanisms, we propose an ASE2 mechanism for this reaction.
- Montheard, Jean-Pierre,Camps, Marcel,Chatzopoulos, Michel,Benzaid, Ahmed
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p. 109 - 116
(2007/10/02)
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