Polymer-supported sulfonated magnetic resin: An efficient reagent for esterification of O-alkyl alkylphosphonic-and carboxylic-acids
A mild and efficient synthetic method has been developed for the esterification of O-alkyl alkylphosphonic-and carboxylic-acids using polymer-supported sulfonated magnetic resins. Polymer-supported resins are recovered using an external magnet and reused several times.
Reductive cleavage versus hydrogenation of allyl aryl ethers and allylic esters using sodium borohydride/catalytic ruthenium(III) in various aqueous solvent mixtures
The reduction of allyl aryl ethers using sodium borohydride in the presence of a catalytic amount of ruthenium(III) chloride in various aqueous solvent mixtures at 0 °C was examined. In aqueous tetrahydrofuran, hydrogenation was the favored pathway (85-100% yield of the corresponding aryl propyl ether); whereas in aqueous N-methylformamide, reductive cleavage predominated (4:1 mixture of phenolic product/aryl propyl ether). In order to gain some insight into the mechanism for this process, 3-octyn-1-ol and trans-2-decen-1-yl acetate were subjected to similar reductive conditions; and both substrates afforded products inconsistent with a single-electron-transfer mechanism.
Babler, James H.,White, Nicholas A.,Kowalski, Eric,Jast, Jeffrey R.
experimental part
p. 745 - 748
(2011/03/21)
Regiochemical control in palladium(0) and palladium(II) catalysed alkene-formate ester carbonylation reactions
Palladium(0) complexes [Pd(PPh3)4 or Pd(dba) 2], (dba = dibenzylideneacetone) in the presence of 1,4-bis(diphenylphosphino)butane, can catalyse the reaction of alkenes and formate esters to give linear carboxylic esters as the major product, while the branched chain isomer was the principal ester obtained by use of a palladium(II) complex [bis(triphenylphosphine)palladium dichloride] as the catalyst.
Lin, Ivan J. B.,Alper, Howard
p. 248 - 249
(2007/10/02)
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