The Reaction of Organoboranes with Lithium Salts of Trisylhydrazones of Cycloalkanones Followed by Treatment with Iodine
作者:Tsutomu Baba、Kamlakar Avasthi、Akira Suzuki
DOI:10.1246/bcsj.56.1571
日期:1983.5
The titled reaction proceeds smoothly under mild conditions to give corresponding 1-alkylcycloalkenes in excellent yields. The overall reaction provides a convenient synthetic procedure of cycloalkenes for cycloalkanones, with various alkyl substituents readily available by means of hydrobortation.
作者:Beger, J.、Thomas, B.、Vogel, T.、Kirmse, K.、Lang, R.
DOI:——
日期:——
Ionic-liquid-like copolymer stabilized nanocatalysts in ionic liquids: II. Rhodium-catalyzed hydrogenation of arenes
作者:C ZHAO、H WANG、N YAN、C XIAO、X MU、P DYSON、Y KOU
DOI:10.1016/j.jcat.2007.05.014
日期:2007.8.15
Rhodium nanoparticles stabilized by the ionic-liquid-like copolymer poly [(N -vinyl-2-pyrrolidone)-co-(1-vinyl-3-butylimidazolium chloride)] were used to catalyze the hydrogenation of benzene and other arenes in ILs. The nanoparticle catalysts can endure forcing conditions (75 degrees C, 40 bar H-2), resulting in high reaction rates and high conversions compared with other nanoparticles that operate in ILs. The hydrogenation of benzene attained record total turnovers of 20,000, and the products were easily separated without being contaminated by the catalysts. Other substrates, including alkyl-substituted arenes, phenol, 4-n-propyl phenol, 4-methoxyl phenol, and phenyl-methanol, were studied and in most cases were found to afford partially hydrogenated products in addition to cyclohexanes. In-depth investigations on reaction optimization, including characterization of copolymers, transmission electron microscopy, and an infrared spectroscopic study of nanocatalysts, were also undertaken. (c) 2007 Elsevier Inc. All rights reserved.