نتایج جستجو برای: solvent free condition

تعداد نتایج: 857817  

Journal: :Mathematics and Computers in Simulation 2009
Marcos Gaudiano Germán Ariel Torres Cristina Vilma Turner

Westudied a one-dimensional free boundary problemarising in the polymer industry, which solution has an interesting asymptotic behavior when a convective boundary condition is imposed. We show the asymptotic behavior of the free boundary and of the concentration of the solvent in the domain, for large t . Exact estimates and numerical results are obtained. Mathematical subject classification: 3...

2001
Ahmad Shaabani Donald G. Lee

The oxidations of organic compounds by permanganate under solvent free conditions have been studied. Thiols and primary aromatic amines undergo oxidative coupling reactions to give disulfides and diazenes, respectively, sulfides are oxidized to sulfones, primary and secondary alcohols are converted to aldehydes and ketones, 1,4-diols and cyclic ethers give lactones and arenes are oxidized to th...

Journal: :iranian chemical communication 2015
navabeh nami mehdi forouzani hassan ghasemnejad-bosra omid khalilpour tylami

one-pot reaction of aldehydes or ketons with aniline derivatives was performed using nabh4 and fe3o4 magnetic nanoparticles (mnps). the optimum amount of fe3o4 mnps was 5 mol% under solvent free condition. the corresponding products were obtained in good to excellent yields. the magnetically recoverable iron oxide nanoparticles are found to be efficient for synthesis of amine derivatives. these...

2012
Suresh Patil S. D. Jadhav

The reaction of primary aromatic amines with aryl aldehydes is found to be catalyzed by lemon juice as natural acid under solvent-free conditions to give the corresponding Schiff bases in good yields. This eco-friendly reaction has many advantages like economical, environmental, mild reaction conditions and simple work-up with high product yield.

Journal: :Chemistry Letters 2001

Journal: :Tetrahedron Letters 2001

2018
Yang Zong Liting Yang Shanyu Tang Longjia Li Wanjie Wang Bingxin Yuan Guanyu Yang

An efficient catalytic system was developed for the acetalization and ketalization of carbonyl compounds with polyhydric alcohols under mild solvent-free conditions. In the presence of 0.1 mol% CoCl2 and 0.2 mol% dimethylglyoxime at 70 ◦C under 5 KPa pressure for 1 h, 95.3% conversion of cyclohexanone and 100% selectivity of the corresponding cyclic ketal could be obtained, where TOF reached as...

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