Solvent-Free Polymerizations and Processes. Minimization of Conventional Organic Solvents

Green chemistry
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That is, the These would be This is true not only of the crystals of An efficient synthesis of quinolines under solvent-free conditions. The reaction mixture was cooled at room temperature and rendered basic pH. Paal-Knorr pyrrole synthesis on smectites as recyclable and green catalysts. Oil reported as oil A simple, efficient and eco-friendly method for the synthesis of thiosemicarbazones from thiosemicarbazides and aldehyde under microwave irradiation has been reported, and no solvent and catalyst were used. And the technique of microwave irradiation coupled with solvent-free condition proved to be a quite valuable method in the organic synthesis.

The formation of carbon-carbon bonds is an essential theme throughout organic chemistry. The use of transition-metal catalysts to form carbon-carbon bonds, once relegated to more advanced texts, is now commonly found in introductory organic textbooks. However, commensurate laboratory experiments for first-year organic students are more limited. Towards room temperature, direct, solvent free synthesis of tetraborohydrides. Due to their high hydrogen content, tetraborohydrides are discussed as potential synthetic energy carriers.

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The reactive milling technique can also be applied to synthesize other borohydrides from their respective metal hydrides. Piper-betle-shaped nano-S-catalyzed synthesis of 1-amidoalkylnaphthols under solvent-free reaction condition: a greener "nanoparticle-catalyzed organic synthesis enhancement" approach. The catalyst could be reused up to the fifth cycle without loss in its action.

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The green-ness of the present protocol was also measured using green metrics drawing its superiority. The development of materials for CO2 capture with high selectivity and high tolerance to H2S is of prime importance for various industrially relevant gas streams e. Grinding solvent-free Paal-Knorr pyrrole synthesis on smectites as An environmentally benign method for the synthesis of N-substituted pyrroles from one-pot solvent-free Solvent-free synthesis of nanosized hierarchical sodalite zeolite with a multi-hollow polycrystalline structure.

A solvent-free route is developed for preparing nanoscale sodalite zeolite with a multi-hollow structure. Furthermore, the synthesis of nanosized hollow sodalite polycrystalline aggregates with a mesoporous structure and high crystallinity. Microwave-assisted silica-promoted solvent-free synthesis of The newly Table 1. Silica promoted microwave-assisted solvent-free synthesis of quinazolinone Time min. Feb 25, Box , Hamedan, Iran. Arylmethanes are useful compounds in organic synthesis and industry Spectroscopic data is very useful for studying the ground state equilibrium of The proposed mechanism for the synthesis of E- imines in presence of Synthesis of halide- and solvent free metal borohydrides.

The synthetic strategy ensures that no metal Furthermore, the structural trends are investigated by synchrotron radiation powder X Synthesis and characterization of solvent-free ionic molybdenum disulphide MoS2 nanofluids. A development of the novel and stable solvent-free ionic MoS 2 nanofluids by a facile and scalable hydrothermal method is presented.

The nanofluids were synthesized by surface functionalizing nanoscale MoS 2 from hydrothermal synthesis with a charged corona, and ionically tethering with oligomeric chains as a canopy. The obtained solvent-free nanofluids are homogeneous, stable amber-like fluids with no evidence of phase separation. The nanofluids could be easily dispersed in both aqueous and organic solvents to form transparent and stable liquids due to the ionic nature and the presence of oligomeric polymer chains.

As reported in our previous communication, the nanofluids showing lower, more stable friction coefficients of less than 0. For deeper understanding of the nanofluids, the details of synthesis , chemical structures, rheological behaviors and molecular dynamics of the nanofluids were investigated in details.

The rheological behaviors can be tailored by varying the grafting density of the canopy. Gu, Shu-Ying, E-mail: gushuying tongji. Furthermore, the synthesis of nanosized hollow sodalite polycrystalline aggregates with a mesoporous structure and high crystallinity is investigated by adding an organosilane surfactant as a mesopore-generating agent. A Solvent-free Synthesis of Polyhydroquinolines via Hantzsch A simple and efficient procedure for the synthesis of polyhydroquinolines was developed, involving a one-pot four-component Solvent free lipase catalyzed synthesis of butyl caprylate.

Nov 10, Synthesis of Halide- and Solvent free metal borohydrides. Besides new compounds, new polymorphs A near quantitative yield of dithioacetal was obtained over H-beta 19 at room temperature Dithioacetals are an important class of versatile compounds extensively applied in pharmaceuticals, separations, electrochemistry, and organic synthesis , but few heterogeneous catalytic systems are reported to be generally applicable for their synthesis from a wide range of substrates.

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The reaction afforded and acyl analogues of harmaline in good yield, along with minor quantities of N-acyl-tryptamines and 8-acyl analogues of N-acyltryptamines. After the reactions, the desired products were easily obtained in good to excellent yields through simple manipulation. Some Wittig reactions can be carried out by grinding the reactants in a mortar with a pestle for about 20 minutes, as per investigation. A laboratory experiment involving a solvent-free Wittig reaction that can be completed in a three-hour sophomore organic chemistry laboratory class period, are developed.

A solvent-free environmentally benign synthesis of oleylamine capped silver nanoparticles is presented. Upon heating 10 equivalents of oleylamine and silver nitrate at degree C for 30 min followed by a precipitation step using ethanol as the precipitant particles characterized by an Z-average diameter of 63 nm were obtained. Dried particles can be easily redispersed in unpolar solvents or monomers, which pave the way for using them as an antimicrobial additive in polymeric materials.

In particular, newly prepared Ag-particles were dispersed in dicyclopentadiene and the mixture was cured using ring opening metathesis polymerization yielding an antimicrobially equipped duroplastic material. Solvent free one pot synthesis of amidoalkyl naphthols over phosphotungstic acid. Full Text Available Montmorillonite KSF clay was effectively modified by the encapsulation of phosphotungstic acid into the clay layers via sonication followed by incipient wet impregnation method.

Excellent yield, shorter reaction time, easy work-up, and reusability of the catalyst are the main attractions of this green procedure. Full Text Available A microporous metal- organic framework MOF, cobalt-based zeolitic imidazolate framework ZIF, was synthesized by the combination of solvent-free hand-mill and microwave irradiation, without any organic solvent and within 30 minutes.

In addition, the outstanding electromagnetic wave absorption capability of cobalt leads to efficient conversion to MOF structures before carbonization. The obtained ZIF possesses high surface area and micropore volume.

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The ensuing aryl diazonium salts supported on nano-SPIA were sufficiently stable to be kept at room temperature in the dry state. This method is a novel, efficient, eco-friendly route for solvent-free synthesis of aryl iodides. This method has advantages such as the avoidance of organic solvents, high yield of pure products, short reaction times, and operational simplicity. Poorly water-soluble drugs often suffer from limited or irreproducible clinical response due to their low solubility and dissolution rate. Microwave-assisted clean synthesis of amides via aza-wittig reaction under solvent-free condition.

A solvent-free microwave-assisted coupling of phosphazenes with acyl chlorides or carboxylic anhydrides in presence of triethylphosphite has been accomplished resulting in a clean synthesis of amides in good yields. Unlike the prevailing time-consuming solution phase methodologies employing chlorinated solvents, benzene carcinogenic , etc, the present protocol is an eco friendly, rapid and simple approach. An atom-economic solvent-free synthesis of amides by the Ritter reaction of alcohols and nitriles under microwave irradiation is reported.

Full Text Available Reaction between aryl aldehydes, acetylacetone and alkyl isocyanides in solvent-free conditions provided a simple and efficient one-pot route for the synthesis of 1- 2-alkylaminomethylaryl-4H-[1,3]dioxinylethanone derivatives in excellent yields. Efficient synthesis of sulfonamide derivatives on solid supports catalyzed using solvent-free and microwave-assisted methods.

1. Introduction

In this work we report the synthesis of sulfonamide derivatives using a conventional procedure and with solid supports, such as silica gel, florisil, alumina, 4A molecular sieves, montmorillonite KSF, and montmorillonite K10 using solvent-free and microwave-assisted methods. Our results show that solid supports have a catalytic activity in the formation of sulfonamide derivatives.

We found that florisil, montmorillonite KSF, and K10 could be used as inexpensive alternative catalysts that are easily separated from the reaction media. Additionally, solvent-free and microwave-assisted methods were more efficient in reducing reaction time and in increasing yield.

Nanocrystalline copper II oxide-catalyzed one-pot four- component synthesis of polyhydroquinoline derivativesunder solvent-free conditions. Full Text Available The efficient and environmentally friendly method for the one-pot synthesis of polyhydroquinolines has been developed in the presence of CuO nanoparticles. The multi-component reactions of aldehydes, dimedone, ethyl acetoacetate andammonium acetate were carried out under solvent-free conditions to afford some polyhydroquinoline derivatives.

This method provides several advantages including high yields, low reaction times and little catalyst loading. Acid catalyzed solvent free synthesis of new 1-acylbenzhydryl substituted pyrazoles. A convenient, cost effective and environmentally benign methodology has been developed, which delivered fourteen new 1-acylbenzhyrdyl substituted pyrazole derivatives under solvent free conditions. Target compounds were synthesized in good to excellent yields simply by grinding reactants in a pestle and mortar with catalytic amount of conc.

Therefore, shorter oligomers feel a stronger entropic penalty in the ordered solid and favor the disordered phase. Strikingly, we found that the solvent-free system has a. Full Text Available A highly efficient, green and simple solvent-free method for the synthesis of 1-amidoalkylnaphthols via one-pot multi-components condensation of 2-naphthol, aromatic aldehydes and amides in the presence of catalytic amount of silica-supported molybdatophosphoric acid H3PMo12O The reactions proceed rapidly and the title compounds are produced in high to excellent yields.

Green and solvent-free procedure for microwave-assisted synthesis The synthesis of metal sulfide MS materials with sizes in the sub nm regime often requires capping agents with long hydrocarbon chains that affect their structures and properties. Herein, this study presents a molten-state synthesis method for a series of transition-MS nanoparticles using thiourea as a reactive precursor without capping agents.

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Thiourea first melts to form a molten-state condition to serve as the reaction medium at a relatively low temperature synthesis protocol, owing to its dynamic characteristics, involves the formation of a variety of organic carbon nitride polymeric complexes around the MS particles.