Synthesis of new malonaldehyde derivatives using 2-heteroaryl-substituted trimethinium salts

Mehranpour, Abdolmohammad; Hashemnia, Sedigheh; Azamifar, Fereshteh

doi:10.1016/j.tetlet.2012.11.046

Cited by 17 publications

(7 citation statements)

References 21 publications

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“…One is characterized by a dense array of short OEG “hairs”, while the other exposes the DAA nitrogen atoms. There is ample evidence for ether cleavage reactions as well as functionalization of nitrogen-based hetaromatics of the pyridine type so that the present work lays the foundation for a systematic exploration of postpolymerization modification on both sides of the same sheet. The mechanical stability of sheet S3 is reflected by the ability to span huge holes.…”

mentioning

confidence: 85%

Room Temperature Synthesis of a Covalent Monolayer Sheet at Air/Water Interface Using a Shape-Persistent Photoreactive Amphiphilic Monomer

Chen

Payamyar

et al. 2014

ACS Macro Lett.

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The shape-persistent monomer 3 with its three 1,8-diazaanthracene (DAA) units is spread and compressed at the air/water interface and the layer then converted into a 1.5 nm thick covalent monolayer sheet by photoirradiation under ambient conditions. The sheet obtained under these extremely mild conditions is mechanically stable to carry its own weight when spanned over TEM grids. While its molecular structure cannot be given yet with certainty, it is likely to be the result of [4 + 4]-cycloaddition dimerizations between the DAA units of neighboring monomers. Evidence is based on the wavelength of the monomer fluorescence emission, the kinetics of this emission’s intensity decay with irradiation time, and the mechanical sheet stability that suggests a surpassing of percolation threshold. Finally, the thermal stability of the sheet is investigated.

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mentioning

confidence: 85%

Room Temperature Synthesis of a Covalent Monolayer Sheet at Air/Water Interface Using a Shape-Persistent Photoreactive Amphiphilic Monomer

Chen

Payamyar

et al. 2014

ACS Macro Lett.

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“…Mehranpour et al 134 also obtained insoluble salts by reacting quinoline derivatives with bromoacetic acid, even though the reaction conditions were slightly modified. Quinoline and pyridine derivatives could be recovered later by hydrolyzing the salts in a basic environment.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Nitrogen Removal from Oil: A Review

2016

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The selective removal of nitrogen-containing compounds from oil and oil fractions is of interest because of the potential deleterious impact of such compounds on products and processes. Problems caused by nitrogen-containing compounds include gum formation, acid catalyst inhibition and deactivation, acid−base pair-related corrosion, and metal complexation. A brief overview of the classes of nitrogen compounds found in oil is provided. The review of processes to remove nitrogen from oil emphasizes studies that investigated denitrogenation of industrial feedstocks, such as refinery fractions, heavy oils, and bitumens. The main topics covered are hydrotreating, liquid−liquid phase partitioning, solvent deasphalting, adsorption, chemical conversion followed by separation, and microbial conversion. Chemical conversion processes include oxidative denitrogenation, N-alkylation, complexation with metal salts, and conversion in high-temperature water. There are many processes for denitrogenation by separation of the nitrogen-rich products from oil without removing the nitrogen group from the nitrogencontaining compounds. As a consequence, most of these processes are viable mainly for removal of nitrogen from low-nitrogencontent oils, typically with <0.1 wt % N. At present, hydrodenitrogenation appears to be the only industrially viable process for nitrogen removal from oils with high nitrogen content.

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“…As shown in Scheme 3, the procedure is done in two-step: (i) synthesis of the 2-substituted vinamidinium salts (2a-g) by the Vilsmeier-Arnold formylation of the substituted acetic acids (1a-g) as explained in authors previous work; [67][68][69][70][71][72][73][74][75][76] and (ii) synthesis of cyclophane derivatives (5a-f, 6a-g) by the reaction of 2-substituted vinamidinium salts (2a-g) with 1,4- 4) in reuxing acetonitrile in the presence of acetic acid for 15 h to manage the cyclophane derivatives (5a-f, 6ag). To provide the best reaction conditions in second step, the reaction of vinamidinium salt 2f with 1,4-phenylenedimethanamine (3) was chosen as model reaction and the impacts of solvents and catalysts were investigated.…”

Section: Resultsmentioning

confidence: 99%

“…They can easily undergo condensation reaction with bifunctional nucleophiles to form heterocycles. During past years, our group has been investigated the utilization of vinamidinium salts for the synthesis of heterocyclic compounds [67][68][69][70][71][72][73][74][75][76] (Scheme 2).…”

Section: Introductionmentioning

confidence: 99%

A facile and efficient route to one-pot synthesis of new cyclophanes using vinamidinium salts

2021

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Synthesis of new malonaldehyde derivatives using 2-heteroaryl-substituted trimethinium salts

Cited by 17 publications

References 21 publications

Room Temperature Synthesis of a Covalent Monolayer Sheet at Air/Water Interface Using a Shape-Persistent Photoreactive Amphiphilic Monomer

Room Temperature Synthesis of a Covalent Monolayer Sheet at Air/Water Interface Using a Shape-Persistent Photoreactive Amphiphilic Monomer

Nitrogen Removal from Oil: A Review

A facile and efficient route to one-pot synthesis of new cyclophanes using vinamidinium salts

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