EFFECTIVE HYDROGENATION OF CARBON-CARBON TRIPLE BONDS BY NaBH4/PdCl2 IN POLYETHYLENE GLYCOL/CH2Cl2: USEFULNESS OF PEG IN SYNTHETIC REACTIONS
The NaBH4-PdCl2-polyethylene glycol-CH2Cl2 system has been found to be effective for the hydrogenation of carbon-carbon triple bonds to the corresponding cis-alkenes.
Suzuki, N.,Kaneko, Y.,Tsukanaka, T.,Nomoto, T.,Ayaguchi, Y.,Izawa, Y.
p. 2387 - 2392
(2007/10/02)
DIENCARBONSAEUREN AUS 1,3-DIENEN UND CO2 DURCH C-C-VERKNUEPFUNG AN NICKEL(0)
(Lig)Ni0 systems react with 1,3-dienes in the presence of CO2 to give nickela carboxylates.The influence of ligands and temperature on the regioselectivity of the C-C bond formation is elucidated.In some cases the nickela carboxylates undergo reductive elimination under the influence of maleic anhydride, and the coupled diene/CO2 moiety rearranges to give the diene carboxylic acid.A possible reaction sequence is discussed.
Hoberg, H.,Schaefer, D.,Oster, B. W.
p. 313 - 320
(2007/10/02)
Selective Reactions in Polyethylene Glycol. Hydrogenation of Acetylenes by NaBH4-PdCl2 in Polyethylene Glycol-Methylene Dichloride
The NaBH4-PdCl2-polyethylene glycol-CH2Cl2 system has been found to be effective for the hydrogenation of acetylenic triple bonds to the corresponding cis-alkenes.
Lithium/Ammonia Reductions of 2-Thiophenecarboxylic Acids
Lithium/ammonia reductions of 2-thiophenecarboxylic acids (1) in the absence of a proton source afforded mixtures of products.In the presence of methanol acyclic mercapto carboxylic acids (4) were the major products.Ring closure of 4 to the corresponding thiolactones (12) showed the double bonds in 4 to be of cis geometry.Attempts were made to prepare Z olefinic compounds derived from these mercapto carboxylic acids.Lithium 2-thiophenecarboxylate salts (2) afforded good yields of the corresponding 2,5-dihydro-2-thiophenecarboxylic acids (3).The presence of substituents on the ring and the ratio of metal to acid were significant factors in determining the nature of this products.A mechanism is proposed to explain the products observed.
Blenderman, Walter G.,Joullie, Madeleine M.,Preti, George
p. 3206 - 3213
(2007/10/02)
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