Epoxidation of alkenes with O-ethylperoxycarbonic acid generated in situ in an alkaline biphasic solvent system

1979 ◽  
Vol 44 (14) ◽  
pp. 2569-2571 ◽  
Author(s):  
Robert D. Bach ◽  
Michael W. Klein ◽  
Rose A. Ryntz ◽  
Joseph W. Holubka
Keyword(s):  
Solvent System ◽  
Epoxidation Of Alkenes

scholarly journals Quantitative Analysis of Sulpiride and Impurities of 2-Aminomethyl-1-Ethylpyrrolidine and Methyl-5-Sulphamoyl-2-Methoxybenzoate in Pharmaceuticals by High-Performance Thin-Layer Chromatography and Scanning Densitometry

1999 ◽  
Vol 82 (4) ◽  
pp. 825-829 ◽  
Author(s):  
Danica Agbaba ◽  
Tatjana Miljkovic ◽  
Valentina Marinkovic ◽  
Dobrila Zivanov-Stakic ◽  
Sote Vladimirov
Keyword(s):  
Quantitative Analysis ◽  
Thin Layer ◽  
High Performance ◽  
Methylene Chloride ◽  
Solvent System ◽  
Ammonia Solution ◽  
Dosage Forms ◽  
Raw Material ◽  
Layer Chromatography

Abstract A simple and reliable thin-layer chromatographic method for determining sulpiride and impurities of 2-aminomethyl-1-ethylpyrrolidine and methyl-5-sulphamoyl-2-methoxybenzoate was developed and validated. A methylene chloride–methanol–ammonia solution (25%; 18 + 2.8 + 0.4, v/v) solvent system is used for separation and quantitative evaluation of chromatograms. The chromatographic plate is first scanned at 240 nm to locate chromatographic zones corresponding to sulpiride and methyl-5-sulphamoyl-2-methoxybenzoate. Then 2-aminomethyl-1-ethylpyrrolidine is derivatized in situ with ninhydrin, and resulting colored spots are measured at 500 nm. The method is reproducible and convenient for quantitative analysis and purity control of sulpiride in its raw material and in its dosage forms.

A synergetic effect of ionic liquid and microwave irradiation on the acid-catalyzed direct conversion of cellulose into methyl glucopyranoside

Holzforschung ◽  
2018 ◽  
Vol 72 (12) ◽  
pp. 1025-1030
Author(s):  
Mafuyu Saito ◽  
Takao Kishimoto ◽  
Masahiro Hamada ◽  
Noriyuki Nakajima ◽  
Daisuke Urabe
Keyword(s):  
Ionic Liquid ◽  
Microwave Irradiation ◽  
Synergetic Effect ◽  
Acid Catalyst ◽  
Solvent System ◽  
Direct Conversion ◽  
Important Research Topic ◽  
Acid Catalyzed ◽  
Methyl Pyrrolidone

AbstractConversion of lignocellulose into useful chemicals is an important research topic in the area of biomass utilization. In this study, microcrystalline cellulose (MC) was dissolved in a mixed-solvent system containing the ionic liquid (IL) 1-allyl-3-methylimidazolium chloride ([Amim]Cl) andN-methyl-pyrrolidone (NMP), and the cellulose was directly converted into methyl glucoside (MG) by acid-catalyzed methanolysis aided by microwave irradiation (μWIr). Under moderate reaction temperature and pressure, and in the presence of acetyl chloride/methanol (in situformed HCl) as an acid catalyst, MG was obtained in a 42% yield. In contrast, in the absence of either IL or μWIr, the MG yield was only 5 or 21%, respectively. Both μWIr and the dissolution of cellulose in IL were quite effective for the conversion of cellulose into MG.

Silicon Micromachined Infrared Thin-Layer Cell for In Situ Spectroelectrochemical Analysis of Aqueous and Nonaqueous Solvent System

2005 ◽  
Vol 17 (11) ◽  
pp. 959-964 ◽  
Author(s):  
Kwang-Seok Yun ◽  
Segyeong Joo ◽  
Hong-Jeong Kim ◽  
Juhyoun Kwak ◽  
Euisik Yoon
Keyword(s):  
Thin Layer ◽  
Solvent System ◽  
Nonaqueous Solvent ◽  
Layer Cell ◽  
Thin Layer Cell

Asymmetric epoxidation of alkenes catalyzed by novel chiral porphyrin metal complexes

2016 ◽  
Vol 20 (06) ◽  
pp. 730-737 ◽  
Author(s):  
Pachiannan Sakthipriya ◽  
Nallamuthu Ananthi
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Asymmetric Epoxidation ◽  
Excellent Yield ◽  
Chiral Epoxides ◽  
Epoxidation Reaction ◽  
Epoxidation Of Alkenes

Novel chiral porphyrin ligands were synthesized from four different chiral aldehydes. In situ transition metal complexes of these novel chiral porphyrin ligands were found to catalyze asymmetric epoxidation reaction of styrene possessing various substituents. The chiral epoxides were formed in excellent yield and ee.

A cascade aerobic epoxidation of alkenes over Au/CeO2 and Ti-mesoporous material by “in situ” formed peroxides

2009 ◽  
Vol 264 (1) ◽  
pp. 44-53 ◽  
Author(s):  
Carmela Aprile ◽  
Avelino Corma ◽  
Marcelo E. Domine ◽  
Hermenegildo Garcia ◽  
Chris Mitchell
Keyword(s):  
Mesoporous Material ◽  
Epoxidation Of Alkenes

Synthesis of poly-2-hydroxyethyl methacrylate–montmorillonite nanocomposite via in situ atom transfer radical polymerization

2008 ◽  
Vol 23 (12) ◽  
pp. 3316-3322 ◽  
Author(s):  
Ayhan Oral ◽  
Talal Shahwan ◽  
Çetin Güler
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Interlayer Spacing ◽  
Solvent System ◽  
Polymerization Reaction ◽  
Atom Transfer ◽  
Scanning Calorimetry ◽  
Copper Bromide ◽  
Transmission Electron

The poly-2-hyroxyethyl methacrylate (PHEMA)/clay nanocomposite was synthesized by in situ atom transfer radical polymerization (ATRP) from initiator moieties immobilized within the silicate galleries of the clay particles. To produce organically modified montmorillonite (MMT) that has ATRP initiator moiety, a new catalyst that consists of quaternary ammonium salt moiety and an initiator moiety was synthesized. This initiator was intercalated into the interlayer spacing of the MMT. The polymerization reaction was carried out in a mixed solvent system consisting of methyl ethyl ketone and 1-propanol at 50 °C, using the initiator that has been already synthesized with a copper bromide catalyst. The 2, 2′-bipyridyl (bpy) complex was used as ligand. The products were characterized via Fourier transform infrared, nuclear magnetic resonance (1H NMR, 12C NMR), transmission electron microscopy, x-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry.

ChemInform Abstract: Epoxidation of Alkenes Using Alkyl Hydroperoxides Generated in situ by Catalytic Autoxidation of Hydrocarbons with Dioxygen.

ChemInform ◽  
2010 ◽  
Vol 31 (26) ◽  
pp. no-no
Author(s):  
Takahiro Iwahama ◽  
Gou Hatta ◽  
Satoshi Sakaguchi ◽  
Yasutaka Ishii
Keyword(s):  
Alkyl Hydroperoxides ◽  
Epoxidation Of Alkenes
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