Green, new and efficient tandem oxidation and conversion of aryl alcohols to 2,4,6-triarylpyridines promoted by [HMIm]NO3-[BMIm]BF4 as a binary ionic liquid
New olefin metathesis catalyst bearing N-mesitylimidazole and nitrate ligands – Synthesis, activity, and performance in aqueous media
作者:Marta Malinowska、Mariana Kozlowska、Agnieszka Hryniewicka、Jacek W. Morzycki
DOI:10.1016/j.jorganchem.2019.06.018
日期:2019.9
activity in the model metathesis reactions. However, its activity increases upon the addition of an aqueous HCl 1 M solution. Activated Ru complex successfully promotes metathesis in organic solvents as well as in water, enabling efficient performance (even up to 100%) of the catalyst under environment-friendly conditions. The activation mechanism of the reported catalyst is supported by time-dependent
Simple protic ionic liquid [Et3NH][HSO4] as a proficient catalyst for facile synthesis of biscoumarins
作者:Sandip K. Patil、Deepak V. Awale、Madagonda M. Vadiyar、Suryakant A. Patil、Sagar C. Bhise、Sanjay S. Kolekar
DOI:10.1007/s11164-017-2932-5
日期:2017.10
Abstract We have explored a number of protic ionicliquids (PILs) as a catalyst for the synthesis of biscoumarins by condensation of 4-hydroxycoumarin with an aromatic aldehyde. Methylimidazolium- and triethylammonium-based PILs were synthesized by simple neutralization reaction with protic acids. Triethylammoniumhydrogensulfate [Et3NH][HSO4] was found to be the best among the studied PILs concerning
Brønsted acidic ionic liquids (ILs) have been synthesized and investigated as catalysts in esterification and transesterification reactions: simple and non-corrosive salts characterized by aliphatic cations associated with an “acidic” anion (in particular, [HSO4]−) gave the higher yields. A quite good correlation between IL acidity (H0) and catalytic ability was found although also the hydrophilic nature of the ionic medium probably affects the process efficiency.
Synthesis, limitations, and thermal properties of energetically-substituted, protonated imidazolium picrate and nitrate salts and further comparison with their methylated analogs
作者:Marcin Smiglak、C. Corey Hines、W. Matthew Reichert、Adam S. Vincek、Alan R. Katritzky、Joseph S. Thrasher、Luyi Sun、Parker D. McCrary、Preston A. Beasley、Steven P. Kelley、Robin D. Rogers
DOI:10.1039/c1nj20677j
日期:——
and nitro, dinitro, and dicyano-substituted derivatives. The melting points of most of the prepared salts were lower than expected and of the 30 compounds prepared, more than half were found to melt below 100 °C. Limitations in the approach were found as a result of the use of energetic electron withdrawing substituents, such as nitro or cyano, which results in a reduction in nucleophilicity of the
A series of tetraimidazolium salts with different anions was prepared and applied in the isomerization of β‐pinene oxide. After examining the activity of different catalysts, a remarkable enhancement of the selectivity of perillyl alcohol (47 %) was obtained over [PEimi][HNO3]4 under mild reaction conditions and using DMSO as the solvent. Furthermore, noncovalent interactions between solvent molecules