New Bronsted acidic ionic liquid, 3-methyl-1-sulfonic acid imidazolium chloride {[Msim]Cl} was used as an efficient, green and reusable catalyst and solvent for the synthesis of N-sulfonyl imines via the condensation of sulfonamides with aldehydes as well as isatin. The reactions proceeded at room temperature and the title compounds were obtained in high to excellent yields and in relatively short reaction times.

3-Methyl-1-Sulfonic acid imidazolium chloride as a new, efficient and recyclable catalyst and solvent for the preparation of N-sulfonyl imines at room temperature

In this work, a green, simple and highly efficient procedure for the synthesis of bis(indolyl)methanes and 4,4′- (arylmethylene)-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol)s [as an important class of bis(pyrazolyl)methanes] is described. The condensation of indoles or 1-phenyl-3-methylpyrazol-5-one with carbonyl compounds catalyzed by poly(ethylene glycol)-bound sulfonic acid (PEG-SO3H) in water affords the title compounds in high yields and relatively short reaction times.

PEG-SO3H as a new, highly efficient and homogeneous polymeric catalyst for the synthesis of bis(indolyl)methanes and 4,4′-(arylmethylene)-bis(3-methyl-1-phenyl-1Hpyrazol-5-ol)s in water

Physical properties such as density, ρ , viscosity, η , refractive index, n , and conductivity, κ , for the binary mixtures of 1-methyl-3-pentyl-imidazolium hexafluorophosphate [MPI][PF 6 ] with poly(ethylene glycol) (PEG) [ M w  = 200] are measured over the whole composition range. The excess molar volumes, V E , are calculated using the measured experimental densities and correlated using the Redlich–Kister type equation. The correlation results are in agreement with the experimental data, and optimal fitting parameters are present. All the V E values within the tested range are negative, and continue to become increasingly negative with increasing temperature. The coefficients of thermal expansion are calculated from the experimental density results using an empirical correlation for T  = 293.15–353.15 K. Deviations in viscosity, Δ η and the refractive index, Δ ϕ n , are calculated from experimental measurements of viscosity, η and refractive index, n , respectively and are fitted using the Redlich–Kister polynomial equation to obtain the binary coefficients and the standard deviations.

Thermophysical properties of a room temperature ionic liquid (1-methyl-3-pentyl-imidazolium hexafluorophosphate) with poly(ethylene glycol)

Several ionic liquids containing pyrrolidinium-, oxopyrrolidinium-, piperidinium-, morpholinium- and trialkylammonium-based cation are synthesized and their thermal property, refractive index, polarity, electrochemical property, and temperature dependency of dynamic viscosity, density and ionic conductivity are characterized. All tetrafluoroborate-based room temperature ionic liquids studied here have a high ionic conductivity (up to 31.4 mS cm−1). These ILs were successfully used as suitable electrolytes for the diffusion coefficient measurement of ferrocene. Absorbance solvatochromic probes Nile red is used to investigate the relative polarity of these ionic liquids and compared them with several organic solvents. The relation of fluidity to conductance is considered in terms of a Walden plot that is shown to provide a useful basis for organizing the applications of solvent media for “green” synthetic reactions.

Synthesis and characterization of protic ionic liquids containing cyclic amine cations and tetrafluoroborate anion

Pyrrolidine and iodine catalyzed domino aldol-Michael-dehydrogenative synthesis of flavones

A smooth conversion of substituted 1-(2-hydroxy phenyl)-3-phenyl-1,3-propane diones to flavones has been done using n-butyl-3-methyl-imidazolium tetrafluoroborate ionic liquid.

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S. P. Parwe

Papers

Ionic liquid promoted expeditious synthesis of flavones