Ag-TiO2 Nanoparticles-Catalyzed Three-Component Synthesis of 12-Aryl-8,9,10,12-Tetrahydrobenzo[a]-Xanthen-11-Ones in Aqueous Medium

2022 ◽  
Vol 25 ◽  
Author(s):  
Mahsa Lotfi Omran ◽  
Seyed Mohammad Vahdat ◽  
Farhosh Kiani Barforosh
Keyword(s):  
Tio2 Nanoparticles ◽  
Cost Efficiency ◽  
Room Temperature ◽  
Chromatographic Method ◽  
Low Cost ◽  
Easy Access ◽  
Atom Economy ◽  
One Pot ◽  
The Difference ◽  
By Products

Background: Ag–TiO2 nanoparticles catalyzed synthesis of 12-aryl-8,9,10,12-tetrahydrobenzo[a]-xanthen-11-ones have been enhanced via a three-component one-pot reaction betweenβ–naphthol, several aldehydes and dimedone in H2O at room temperature. Xanthenes are essential intermediates in chemistry owing to their vast difference in biological activity. Methods: This process offered significant advantages containing appropriate cost efficiency, low amount of the catalyst, application of low-cost available Ag–TiO2 nanoparticles catalyst, purification of the product by non-chromatographic method, easy process, good atom economy, simple isolation and reusability of nanocatalyst. Result: Ag–TiO2 nanoparticles catalyst shows easy access to Xanthenes with appropriate yields in short reaction time and purity. This nanoparticles catalyst was recycled and recovered by easy filtration and was reused up to five times with only an unimportant loss in its catalytic efficacy. Conclusion: This method achieves to have a numerous scope relating to the difference in the aldehydes. Correspondingly, the attractive of this research was that H2O was the only by-products.

Photopolymerizable Liquid Crystal Monomer-Oxide Nanoparticle Composites

2002 ◽  
Author(s):  
S. T. Wellinghoff ◽  
D. P. Nicolella ◽  
D. P. Hanson ◽  
H. R. Rawls ◽  
B. K. Norling
Keyword(s):  
Liquid Crystal ◽  
Room Temperature ◽  
Low Cost ◽  
Internal Stresses ◽  
Polymer Glasses ◽  
One Pot ◽  
Polymerization Shrinkage ◽  
Inorganic Particles ◽  
Ductile Behavior ◽  
Dental Restorative

Methacrylate and acrylate terminated monomers can be rapidly polymerized to polymer glasses useful in biomaterials, photolithography and rapid prototyping, optical coatings and composites. Unfortunately, polymerization shrinkage results in loss of tolerance and the development of internal stresses which can be especially critical in the case of highly crosslinked glasses. Structurally complicated oligomeric mixes of dimethacrylate monomers that exhibit a nematic liquid crystal to isotropic transition above room temperature have been synthesized in a low cost one pot synthesis to surmount the problem of polymerization shrinkage and the propensity of single component monomers to crystallize from the liquid state. Photopolymerization from the ordered liquid crystal state into a less ordered glass minimizes volumetric shrinkages to between 1–2% at greater than 90% polymerization conversion. These polymer glasses exhibited elastic bending moduli of 1.2 GPa to 1.5GPa, fracture strengths of 70–100MPa and fracture toughness of K=0.3–0.4 (MPa)1/2. In some cases the glasses exhibited ductile behavior which is unusual for highly crosslinked materials. Room temperature viscosities of 100P–2000P permit facile processing of the liquid crystal monomers with inorganic particles to make dental restorative composites.

scholarly journals Synthesis of Lipophilic Esters of Tyrosol, Homovanillyl Alcohol and Hydroxytyrosol

Antioxidants ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 174 ◽  
Author(s):  
Roberta Bernini ◽  
Isabella Carastro ◽  
Francesca Santoni ◽  
Mariangela Clemente
Keyword(s):  
Circular Economy ◽  
Room Temperature ◽  
Dimethyl Carbonate ◽  
Low Cost ◽  
Aqueous Media ◽  
Low Molecular Weight ◽  
Health Promoting ◽  
Hydrophilic Character ◽  
Valuable Compounds ◽  
By Products

Low-molecular weight phenols such as tyrosol, homovanillyl alcohol and hydroxytyrosol are valuable compounds that exhibit a high number of health-promoting effects such as antioxidant, anti-inflammatory and anticancer activity. Despite these remarkable properties, their applications such as dietary supplements and stabilizers of foods and cosmetics in non-aqueous media are limited for the hydrophilic character. With the aim to overcome this limitation, the paper describes a simple and low-cost procedure for the synthesis of lipophilic esters of tyrosol, homovanillyl alcohol and hydroxytyrosol. The reactions were carried out under mild and green chemistry conditions, at room temperature, solubilizing the phenolic compounds in dimethyl carbonate, an eco-friendly solvent, and adding a little excess of the appropriate C2–C18 acyl chloride. The final products were isolated in good yields. Finally, according to the “circular economy” strategy, the procedure was applied to hydroxytyrosol-enriched extracts obtained by Olea europaea by-products to prepare a panel of lipophilic extracts that are useful for applications where solubility in lipid media is required.

scholarly journals Bisnis Transportasi dalam Pusaran Globalisasi

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Mutimatun Ni’ami
Keyword(s):  
Public Transportation ◽  
Low Cost ◽  
Legal Protection ◽  
Driving Safety ◽  
Easy Access ◽  
Legal Rules ◽  
Low Costs ◽  
The Difference ◽  
The Government

<p><em>This study aims to examine the differences between conventional taxis and online taxis and whether the existing legal regulations are sufficient to regulate the two modes of transportation. The author's curiosity comes from seeing the past when taxis were considered a luxury means of transportation that people rarely use except for emergencies, so city buses and public transportation become the choice of citizens. The choice that was "forced" to be taken considering the low cost and far coverage. Now, when online taxis offer low costs and easy access, the means of transportation that have become "gods" have fallen. The drivers gasped, the transportation entrepreneurs were distracted to finance their business empire and the passengers were no longer greeted by buses and public transportation. This research is a sociological legal research which makes a phenomenon that exists in society and its influence on existing legal rules. The research results show that the difference between conventional taxis and online taxis lies in the amount of tariff, standardization of services, determination of routes and special features and legal protection. The government needs to be firm in regulating the existence of online transportation, given the potential for conflict over disparity in tariff differences and the importance of legal protection for drivers and passengers in driving safety.</em></p><p><strong><em>Keywords:</em></strong></p><p><em><em>Online Taxi; Conventional Taxi; Legal.</em><br /></em></p>

Base-Mediated 1,6-Aza-Michael Addition of Heterocyclic Amines and Amides to para-Quinone Methides Leading to Meclizine-, Hydroxyzine- and Cetirizine-like Architectures

Synthesis ◽  
2019 ◽  
Vol 51 (23) ◽  
pp. 4434-4442 ◽  
Author(s):  
Deblina Roy ◽  
Gautam Panda
Keyword(s):  
Low Cost ◽  
Scale Up ◽  
Cost Effective ◽  
Heterocyclic Amines ◽  
Atom Economy ◽  
Quinone Methides ◽  
One Pot ◽  
X Ray ◽  
Wide Range ◽  
Mild Temperature

An expeditious, cost-effective synthetic methodology for a wide range of nitrogen-containing unsymmetrical trisubstituted methanes (TRSMs) is reported. The synthesis involves base-mediated 1,6-conjugate addition of heterocyclic amines and amides to substituted para-quinone methides, giving the unsymmetrical TRSMs in moderate to very good yields (up to 83%) in one pot. The low cost, mild temperature, high atom economy and yields, easy scale-up and broad substrate scope are some of the salient features of this protocol. Further, the methodology could be extended for the synthesis of meclizine-, ­hydroxyzine- and cetirizine-like molecules. The structure of one such compound, 2,6-di-tert-butyl-4-((4-chlorophenyl)(4-methylpiperazin-1-yl)methyl)phenol, was determined by single crystal X-ray analysis.

Low cost, surfactant-less, one pot synthesis of Cu2O nano-octahedra at room temperature

2011 ◽  
Vol 184 (8) ◽  
pp. 2209-2214 ◽  
Author(s):  
Asar Ahmed ◽  
Namdeo S. Gajbhiye ◽  
Amish G. Joshi
Keyword(s):  
Room Temperature ◽  
Low Cost ◽  
One Pot ◽  
One Pot Synthesis

scholarly journals Natural Hydroxyapatite: Green Catalyst for the Synthesis of Pyrroles, Inhibitors of Corrosion

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Abdelhadi Louroubi ◽  
Abdallah Nayad ◽  
Ali Hasnaoui ◽  
Rachid Idouhli ◽  
Abdessalam Abouelfida ◽  
...  
Keyword(s):  
Inhibition Efficiency ◽  
High Selectivity ◽  
Low Cost ◽  
Atom Economy ◽  
Commercial Catalyst ◽  
One Pot ◽  
Environmental Friendliness ◽  
Green Catalyst ◽  
Work Up ◽  
Natural Hydroxyapatite

Polysubstituted pyrroles have been synthesized in good yields via a four-component one-pot reaction of 1,3-dicarbonyl compounds, amines, aldehydes, and nitroalkanes using natural hydroxyapatite (HAp) as an efficient green catalyst. This strategy provides advantages such as simple experimental and work-up procedures, mild conditions, high selectivity, low cost, high atom economy, and environmental friendliness; it uses a green commercial catalyst and does not require a solvent. The electrochemical behavior of S300 steel in 1 M hydrochloric acidic was studied in the presence of these heterocyclic compounds. The results showed good inhibition efficiency for steel in acidic media.

scholarly journals Efficient and Facile One-Pot Synthesis of Novel Benzimidazoles using Rice Husk

2020 ◽  
pp. 27-32
Author(s):  
Suman Suman ◽  
Rajvir Singh ◽  
Susheel Gulati ◽  
Suprita Suprita
Keyword(s):  
Rice Husk ◽  
Room Temperature ◽  
Rice Husk Ash ◽  
Atom Economy ◽  
One Pot ◽  
Green Catalyst ◽  
Filter Pump ◽  
High Yields ◽  
Work Up ◽  
Layer Chromatography

New and facile one-pot approach for the synthesis of substituted benzimidazoles from the reaction of substituted benzaldehyde and o-phenylenediamine room temperature using Rice Husk Ash: CaCl2 (RHA:CaCl2) as a green catalyst was presented in the paper. After the completion of the reaction, the reaction mixture was poured into ice-coldwater with stirring, and the precipitated product was filtered using the filter pump. The crude product was then recrystallized from ethanol to give analytically pure samples in good to excellent yield. The purity of compounds were characterized by melting point and thin-layer chromatography. The synthesized compounds were characterized by using 1HNMR and FTIR spectral techniques.Metal-free, short reaction time, high yields, mild reaction condition, simple work-up, high atom economy, cost-effectiveness, and no need for column purification are some beauties of this methodology.

The Efficient Synthesis of 1,3-Diallyloxy-2-Propanol without Solvent

2011 ◽  
Vol 311-313 ◽  
pp. 2106-2109
Author(s):  
Xi Mei Liu ◽  
Yu Hu ◽  
Li Hua Feng
Keyword(s):  
Allyl Alcohol ◽  
Large Scale ◽  
Room Temperature ◽  
Low Cost ◽  
High Yield ◽  
Scale Production ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
One Pot ◽  
Large Scale Production

An efficient and practical protocol for the preparation of 1,3-diallyloxy-2-propanol has been developed by one-pot reaction between epichlorohydrin and allyl alcohol in the presence of KOH without solvent at room temperature. This preliminary approach provides an environmentally-friendly synthetic route to 1,3-diallyloxy-2-propanol with many advantages, i. e., low cost, high yield, easy purification, mild reaction conditions, and large scale production.

Room Temperature Alkali Metal Reduction of Carbon Dioxide

2020 ◽  
Author(s):  
Lucas A. Freeman ◽  
Akachukwu D. Obi ◽  
Haleigh R. Machost ◽  
Andrew Molino ◽  
Asa W. Nichols ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Alkali Metals ◽  
Room Temperature ◽  
Chemical Reduction ◽  
Bond Cleavage ◽  
Open Shell ◽  
Metal Reduction ◽  
One Pot ◽  
Earth Abundant ◽  
Electron Reduction

The reduction of the relatively inert carbon–oxygen bonds of CO<sub>2</sub> to access useful CO<sub>2</sub>-derived organic products is one of the most important fundamental challenges in synthetic chemistry. Facilitating this bond-cleavage using earth-abundant, non-toxic main group elements (MGEs) is especially arduous because of the difficulty in achieving strong inner-sphere interactions between CO<sub>2</sub> and the MGE. Herein we report the first successful chemical reduction of CO<sub>2</sub> at room temperature by alkali metals, promoted by a cyclic(alkyl)(amino) carbene (CAAC). One-electron reduction of CAAC-CO<sub>2</sub> adduct (<b>1</b>) with lithium, sodium or potassium metal yields stable monoanionic radicals clusters [M(CAAC–CO<sub>2</sub>)]<sub>n</sub>(M = Li, Na, K, <b> 2</b>-<b>4</b>) and two-electron alkali metal reduction affords open-shell, dianionic clusters of the general formula [M<sub>2</sub>(CAAC–CO<sub>2</sub>)]<sub>n </sub>(<b>5</b>-<b>8</b>). It is notable that these crystalline clusters of reduced CO<sub>2</sub> may also be isolated via the “one-pot” reaction of free CO<sub>2</sub> with free CAAC followed by the addition of alkali metals – a reductive process which does not occur in the absence of carbene. Each of the products <b>2</b>-<b>8</b> were investigated using a combination of experimental and theoretical methods.<br>

A Series of Metal-Organic Frameworks for Selective CO2 Capture and Catalytic Oxidative Carboxylation of Olefins

2018 ◽  
Author(s):  
Huong T. D. Nguyen ◽  
Y B. N. Tran ◽  
Hung N. Nguyen ◽  
Tranh C. Nguyen ◽  
Felipe Gándara ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Adsorption ◽  
New Materials ◽  
One Pot ◽  
Acid Gas ◽  
Naphthalene Diimide ◽  
Styrene Carbonate ◽  
Metal Organic ◽  
Adsorption Of Co ◽  
The One

<p>Three novel lanthanide metal˗organic frameworks (Ln-MOFs), namely MOF-590, -591, and -592 were constructed from a naphthalene diimide tetracarboxylic acid. Gas adsorption measurements of MOF-591 and -592 revealed good adsorption of CO<sub>2</sub> (low pressure, at room temperature) and moderate CO<sub>2</sub> selectivity over N<sub>2</sub> and CH<sub>4</sub>. Accordingly, breakthrough measurements were performed on a representative MOF-592, in which the separation of CO<sub>2</sub> from binary mixture containing N<sub>2</sub> and CO<sub>2</sub> was demonstrated without any loss in performance over three consecutive cycles. Moreover, MOF-590, MOF-591, and MOF-592 exhibited catalytic activity in the one-pot synthesis of styrene carbonate from styrene and CO<sub>2</sub> under mild conditions (1 atm CO<sub>2</sub>, 80 °C, and solvent-free). Among the new materials, MOF-590 revealed a remarkable efficiency with exceptional conversion (96%), selectivity (95%), and yield (91%). </p><br>

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