6737-11-7Relevant articles and documents
The multiple roles of imidazolium ionic liquids in transition-metal catalysis: The palladium-catalyzed telomerization of 1,3-butadiene with acetic acid
Balbino, Jo?o M.,Peral, Daniel,Bay?n, J. Carles,Dupont, Jairton
, p. 972 - 977 (2015/03/18)
The telomerization of 1,3-butadiene with acetic acid catalyzed by palladium(II) acetate associated with a series of phosphines in 3-(2-methoxyethyl)-1-methylimidazolium acetate was used to investigate the role of the ionic liquid. The ionic liquid plays multiple roles in this reaction as it acts as the solvent, stabilizer, ligand, and cocatalyst. The reaction performed in the presence of Dan2phos, a trifluoromethylated sulfonated triarylphosphine, at 100 °C for 24 h gave a turnover number of 14 600 with 89 % selectivity to telomers at 75 % 1,3-butadiene conversion and complete acetic acid conversion.
PROCESS FOR MAKING BUTENYL ESTERS FROM BUTADIENE
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Page/Page column 13-22, (2008/06/13)
A process for making a butenyl ester from butadiene by reacting butadiene or a hydrocarbon fraction containing butadiene with a saturated aliphatic monocarboxylic acid, wherein the catalyst is rhenium (VII) oxide or an organic sulphonic acid containing at least (2) sulphonic acid groups per molecule wherein the ratio of the number of carbon atoms to the number of sulphonic acid groups in the organic sulphonic acid is in the range 1 : 1 to 1 : 0.15. Preferred catalysts are organic disulphonic acids for example ethane-1,2-disulphonic acid. The process can be used for making unsaturated esters, or, by hydrogenation of the product, for making saturated esters such as for example butyl acetate. Catalyst can be purified and recycled to the reactor.
THE NITROGENATED ALLYLIC SYSTEM AS AN INTRAMOLECULAR NUCLEOPHILE: A NEW ROUTE TO PYRAZOLES
Momose, Takefumi,Toyooka, Naoki,Ikuta, Takashi,Yanagino, Hironobu
, p. 789 - 793 (2007/10/02)
A new route to pyrazoles via the cyclization of N-allyl-N-nitrosoamides is described.