- Sml2-promoted reformatsky-type reaction and acylation of alkyl 1-chlorocyclopropanecarboxylates
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(Chemical Equation Presented) In the presence of HMPA in THF, highly stereoselective Sml2-promoted substitutions of alkyl 1-chlorocyclopropanecarboxylates 1 using various ketones, aldehydes (Reformatsky-type reaction), and acyl chlorides (acyla
- Nagano, Takao,Motoyoshiya, Jiro,Kakehi, Akikazu,Nishii, Yoshinori
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supporting information; experimental part
p. 5453 - 5456
(2009/06/28)
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- Diruthenium(I,I) saccharinate complexes: Synthesis, molecular structure, and evaluation as catalysts for carbenoid reactions of diazoacetates
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The dinuclear ruthenium complexes [Ru2(μ-sac)2(CO)6] (1), [Ru2(μ-sac)2(CH3CN)2(CO)4] (3), [Ru2(μ-sac)2(CO)5(PPh3)] (4) and [Ru2(μ-sac)2(CO)4(PPh3)2] (5) as well as the tetranuclear ruthenium complex [Ru2(μ-sac)2(CO)5]2 (2) (sac = saccharinate, C7H4NO3S-) were synthesized starting from Ru3(CO)12 and saccharin. X-ray crystal structure analysis of 1, 3A × p-xylene, 4 × CH2Cl2 and 5 × 3CH2Cl2 showed that the Ru22 + core is bridged through the amidate moieties of the two saccharinate ligands, with a head-tail arrangement in complexes 1, 3A and 5, and a head-head arrangement in 4. For complex 3, an equilibrium mixture of the head-head regioisomer 3A and a second species 3b exists in solution. Complexes 1 and 2 are suitable catalysts for the cyclopropanation of nucleophilic alkenes (styrene, cyclohexene and 2-methyl-2-butene) with methyl diazoacetate.
- Buck, Stefan,Maas, Gerhard
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p. 2774 - 2784
(2007/10/03)
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- Calixarenes as ligands for transition-metal catalysts: A bis(calix[4]arene-11,23-dicarboxylato) dirhodium complex
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A novel dirhodium tetracarboxylate complex is described in which two calix[4]arene macrocycles, bridged at the upper rim by a Rh-Rh unit, serve as ligands and whose solid-state structure shows an unusual coordination of a toluene molecule in the axial pos
- Seitz, Juergen,Maas, Gerhard
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p. 338 - 339
(2007/10/03)
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- Deprotonation and Diastereoselective Alkylation of Methyl Cyclopropanecarboxylates
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Using model compounds it is demonstrated when deprotonation of methyl cyclopropanecarboxylates leads to ester condensation products and when alkylation of the ester enolate can be performed.Under certain structural conditions (steric and electronic effect
- Reichelt, Ingrid,Reissig, Hans-Ulrich
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p. 3895 - 3914
(2007/10/02)
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- Transition-Metal-Catalyzed Reactions of Diazo Compounds. 1. Cyclopropanation of Double Bonds
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Rhodium(II) and palladium(II) carboxylates are efficient catalysts for the cyclopropanation of olefins by diazo esters.Intramolecular competitions within diolefins and intermolecular competitions between pairs of monoolefins showed quite different cyclopr
- Anciaux, Andre J.,Hubert, Andre J.,Noels, Alfred F.,Petiniot, N.,Teyssie, Philippe
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p. 695 - 702
(2007/10/02)
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