搜索结果: 1-15 共查到“有机化学 solvent”相关记录15条 . 查询时间(0.071 秒)
An efficient one-pot synthesis of dihydropyrimidinones catalyzed by zirconium hydrogen phosphate under solvent-free conditions
Biginelli reaction solvent-free zirconium hydrogen phosphate
2010/10/18
A simple, efficient, and practical procedure for the Biginelli reaction using zirconium hydrogen phosphate [Zr(H2PO4)2] as a novel solid acid catalyst is described under solvent-free conditions in hig...
Ionic liquids as solvent for efficient esterification of carboxylic acids with alkyl halides
Ionic liquids green solvent esterification
2010/10/15
The selective esterification of carboxylic acid derivatives with a variety of alkyl halides was carried out using ionic liquid as solvent in the presence of triethylamine. The reaction was found to pr...
H2{SO}4-silica as an efficient and chemoselective catalyst for the synthesis of acylal from aldehydes under solvent-free conditions
Acylals aldehydes catalysis solvent-free reactions
2010/4/9
A variety of aldehydes react with acetic anhydride in the presence of a catalytic amount of H2SO4-silica to afford the corresponding 1,1-diacetates (acylals) in excellent yields. Ketones are not affec...
High Yielding Oxidative Deprotection of Silyl and Pyranyl Ethers to Their Corresponding Carbonyl Compounds with Strontium Manganate in the Presence of Aluminium Chloride in Solution and Under Solvent-Free Conditions
Strontium manganate aluminium chloride solvent-free conditions oxidative deprotection tetrahydropyranyl ethers
2010/4/13
Strontium manganate (SrMnO4) in the presence of aluminium chloride (AlCl3) is an efficient reagent for the high yielding oxidative deprotection of aromatic and aliphatic silyl and pyranyl ethers into ...
A Convenient and Efficient Synthesis of N-Acylsulfonamides in the Presence of Silica Phosphoric Acid under Heterogeneous and Solvent-Free Conditions
N-acylsulfonamide solvent-free silica phosphoric acid heterogeneous condition N-acylation
2010/4/8
Reaction of sulfonamides with carboxylic acid anhydrides and chlorides in the presence of silica phosphoric acid provided N-acyl sulfonamides in good to high yields. All reactions were performed under...
Studies on the Anion Recognition Properties of Synthesized Receptors III: A Novel Thiourea-Based Receptor Constructed by Benzo-15-Crown-5 for Sensing Anions in a Strong Polar Solvent
Anion recognition thiosemicarbazone binding constant
2010/4/16
new series of receptors were designed and synthesized, and their interactions with anions, such as F-, Cl-, Br-, I-, CH3COO-, HSO4-, and NO3-, in DMSO solvent were investigated using UV-Vis absorption...
Investigation of Some 1,3-Diols for the Requirements of Solvent Extraction of Boron: 2,2,6-Trimethyl-1,3 Heptanediol as a Potential Boron Extractant
1,3-Diols Solvent Extraction of Boron: 2,2,6-Trimethyl-1,3 Heptanediol
2010/4/19
Eighteen 1,3-diols were synthesized and their structure and distribution ratio for the solvent extraction of boron were studied. Diols with a high distribution ratio (D_{B(OH)_3 > 10) were investigate...
Solvent-Free Preparation of Primary Carbamates
Solvent-free N-unsubstituted carbamates isocyanic acid compounds containing hydroxyl group
2010/4/19
Herein, we describe a simple and efficient method for the conversion of compounds containing a hydroxyl group to primary carbamates at room temperature with excellent yield and purity, and without any...
Crystal Habit Modification of Vitamin C (L-Ascorbic Acid) due to Solvent Effects
Crystal Habit Modification of Vitamin C Solvent Effects
2010/4/20
Crystal morphologies are predicted for vitamin C (L-ascorbic acid) using attachment energy methods. The significant differences between predicted and observed morphologies when vitamin C is grown from...
Graft Copolymerization of N-Vinylimidazole on Poly(Ethylene Terephthalate) Fibers in a Swelling Solvent Using Azobisisobutyronitrile as Initiator
Graft copolymerization n-vinylimidazole radical polymerization swelling PET fiber
2010/4/21
In this study, poly(ethylene terephthalate) (PET) fibers were grafted in dimethylformamide (DMF) with n-vinylimidazole (n-VI) using azobisisobutyronitrile (AIBN) as an initiator. Variations of percent...
Comparison of Supercritical Fluid and Solvent Extraction of Feverfew (Tanacetum parthenium)
Supercritical Fluid Solvent Extraction
2010/4/22
High performance liquid chromatography (HPLC) and supercritical fluid chromatography (SFC) analyses are used to show that supercritical fluid extraction (SFE) using carbon dioxide is an effective mean...
Solvent, Temperature and Concentration Effects on the Adsorption of Poly(n-Butyl Methacrylate) on Alumina from Solutions
poly(n-butyl methacrylate) solubility parameter alumina adsorption solvent
2010/4/22
Adsorption of poly(n-butyl methacrylate) (PnBMA) on alumina from solution was studied by UV and FT-IR Photoacoustic Spectroscopy techniques. The effects of the solvent, temperature, concentration, and...
Extraction Equilibria of Nicotinic Acid Using Alamine 300/Diluent and Conventional Solvent Systems
Extraction equilibria Nicotinic acid Alamine 300 Modeling
2010/4/22
The distribution of nicotinic acid between water and Alamine 300 (tri-n-octylamine) dissolved in various (proton-donating and -accepting, polar and nonpolar) diluents, and a comparison with the extrac...
Solvent Extraction of Fe3+ Cation by Diazo-Coupling Calix[4]arenes
Solvent Extraction Fe3+ Cation Diazo-Coupling Calix[4]arenes
2010/6/28
The solvent extraction of Fe3+ cations from the aqueous to the organic (chloroform) phase was carried out using p-tert-butyl calix[4]arene(\underline{1}), calix[4]arene(\underline{2}), diazo-coupling ...
Solvent Extraction of La3+ withEthylenediamine-N,N'-ditetradecyl-N,N'-diacetic Acid(EDDAT) in Dichloromethane
Solvent Extraction La3+ withEthylenediamine-N,N'-ditetradecyl-N,N'-diacetic Acid(EDDAT) Dichloromethane
2010/6/30
Ethylenediamine-N,N'-ditetradecyl-N,N'-diacetic acid (EDDAT) was synthesized for the solvent extraction of La3+. EDDAT was prepared from ethylenediamine-N,N'-diacetic acid (EDDA) and tetradecyl bromid...