scholarly journals Highly efficient one-step microwave-assisted synthesis of structurally diverse bis-substituted α-amino acid derived diimides

RSC Advances ◽  
2018 ◽  
Vol 8 (52) ◽  
pp. 29840-29846 ◽  
Author(s):  
Marcin Konopka ◽  
Grzegorz Markiewicz ◽  
Artur R. Stefankiewicz
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Highly Efficient ◽  
One Step ◽  
Natural Amino Acids

We present a facile and widely applicable microwave-assisted protocol for the synthesis of symmetrical diimides based on three distinct aromatic dianhydrides and five natural amino acids.

One Step Microwave-Assisted Synthesis of Fluorinated Titania Photocatalyst

2015 ◽  
Vol 670 ◽  
pp. 177-182
Author(s):  
Alexey A. Sadovnikov ◽  
Alexander E. Baranchikov ◽  
Vladimir Kozik ◽  
Lyudmila P. Borilo ◽  
Sergey A. Kozyukhin ◽  
...  
Keyword(s):  
Ammonium Fluoride ◽  
Organic Dye ◽  
Microwave Assisted Synthesis ◽  
Dye Sensitized ◽  
Microwave Assisted ◽  
One Step ◽  
Nanocrystalline Titanium ◽  
Nanocrystalline Titanium Dioxide ◽  
Titania Photocatalyst ◽  
Hydrolysis Of

Microwave-assisted high temperature hydrolysis of titanium oxysulfate, in the presence of ammonium fluoride, allows synthesizing nanocrystalline titanium dioxide photocatalysts possessing photocatalytic activity as high as the commercial photocatalyst Evonik Aeroxide® TiO2 P 25. Dye-sensitized reactions play an important role in organic dye discoloration in the presence of fluorinated titania.

One-step microwave-assisted synthesis of carbon-supported ternary Pt-Sn-Rh alloy nanoparticles for fuel cells

2020 ◽  
Vol 115 ◽  
pp. 272-278
Author(s):  
Xiaobo Hu ◽  
Pingping Song ◽  
Xiaolong Yang ◽  
Cheng Wang ◽  
Jianlong Wang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Microwave Assisted Synthesis ◽  
Alloy Nanoparticles ◽  
Microwave Assisted ◽  
One Step

Preparation of Peptide o-Aminoanilides Using a Modified Dawson's Linker for Microwave-Assisted Peptide Synthesis

Synlett ◽  
2017 ◽  
Vol 28 (15) ◽  
pp. 1956-1960 ◽  
Author(s):  
Shugo Tsuda ◽  
Taku Yoshiya ◽  
Tsuyoshi Uemura ◽  
Masayoshi Mochizuki ◽  
Hideki Nishio
Keyword(s):  
Amino Acid ◽  
Peptide Synthesis ◽  
Solid Phase ◽  
Side Reactions ◽  
Microwave Assisted Synthesis ◽  
Terminal Amino Acid ◽  
Nitrobenzoic Acid ◽  
Microwave Assisted ◽  
Peptide Thioester ◽  
Terminal Amino

Based on the structure of Dawson’s 3,4-diaminobenzoic acid (Dbz) linker designed for Fmoc solid-phase peptide-thioester synthesis, the 4-amino-3-nitrobenzoic acid [Dbz(NO2)] linker was developed for microwave-assisted synthesis. The Dbz(NO2) linker can be readily converted into the Dbz linker by on-resin reduction with SnCl2 after construction of the protected peptide resin. Although epimerization of C-terminal amino acid restricts the use of Dbz(NO2) linker to the synthesis of peptide-Gly-thioester, use of this linker can prevent side reactions that arise when Dbz or Dbz(Aloc) linkers are used in the microwave-assisted synthesis of Gly-rich peptides.

Biodegradable Polymers Derived from Amino Acids for Biological Applications

2010 ◽  
Vol 76 ◽  
pp. 30-35 ◽  
Author(s):  
Naomi Cohen-Arazi ◽  
Ilanit Hagag ◽  
Michal Kolitz ◽  
Abraham J. Domb ◽  
Jeoshua Katzhendler
Keyword(s):  
Amino Acids ◽  
Molecular Weight ◽  
Ring Opening ◽  
Building Blocks ◽  
Ring Opening Polymerization ◽  
Microwave Assisted Synthesis ◽  
Hydroxy Acids ◽  
Natural Amino Acids ◽  
Direct Condensation ◽  
Positively Charged

Optically active α-hydroxy acids derived from amino acids have been synthesized and polymerized into new biodegradable polyesters. The variety of functional side chains enables the design of positively charged, negatively charged, hydrophobic and hydrophilic chiral building blocks or any combination of these constituents. Hydroxy acids of 15 natural amino acids were prepared with retention of configuration using a straightforward and reliable method of diazotization of α-amino acids. Polyesters were synthesized from these hydroxy acids by a number of methods: direct condensation in bulk, microwave assisted synthesis and ring opening polymerization. The molecular weight of the prepared polymers ranges between 2000 to 5000Da for the direct condensation and the microwave methods, whereas the ring opening polymerization results in high molecular weight polymers (20000 to 30000Da). The polymers were analyzed for their optical activity (Circular Dichroism Spectroscopy), thermal properties (DSC), solubility, molecular weight and polydispersity (GPC), and aqueous degradation. These polymers were tested for their compatibility to neuronal cells growth and differentiation.

Multifunctional lubricant additives derived from natural amino acids and methyl oleate

RSC Advances ◽  
2015 ◽  
Vol 5 (95) ◽  
pp. 77538-77544 ◽  
Author(s):  
Arukali Sammaiah ◽  
Korlipara V. Padmaja ◽  
Shiva Shanker Kaki ◽  
Rachapudi B. N. Prasad
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Methyl Oleate ◽  
Thioglycolic Acid ◽  
Methyl Esters ◽  
Lubricant Additives ◽  
Acid Methyl ◽  
Multifunctional Additives ◽  
Natural Amino Acids ◽  
Amino Acid Methyl Esters

Novel multifunctional additives were synthesized from methyl oleate via thioglycolic acid addition followed by condensation with different amino acid methyl esters.

scholarly journals Microwave-assisted synthesis of high thermal stability and colourless polyimides containing pyridine

2019 ◽  
Vol 6 (6) ◽  
pp. 190196 ◽  
Author(s):  
Kai Cheng ◽  
Jie-pin Hu ◽  
Yan-cheng Wu ◽  
Chu-qi Shi ◽  
Zhi-geng Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Synthesis Method ◽  
Optical Transmittance ◽  
Aromatic Diamine ◽  
Microwave Assisted Synthesis ◽  
Step Method ◽  
Light Emitting ◽  
Microwave Assisted ◽  
One Step ◽  
Biphenyltetracarboxylic Dianhydride

A novel aromatic diamine containing pyridyl side group, 4-pyridine-4,4-bis(3,5-dimethyl-5-aminophenyl)methane (PyDPM), was successfully synthesized via electrophilic substitution reaction. The polyimides (PIs) containing pyridine were obtained via the microwave-assisted one-step polycondensation of the PyDPM with pyromellitic dianhydride (PMDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 3,3′,4,4′-diphenylether tetracarboxylic dianhydride (ODPA) and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA). Contrarily to the reported similar PIs, these PIs exhibit much higher thermal stability or heat resistance, i.e. high glass transition temperatures ( T g s) in the range of 358–473°C, and the decomposition temperatures at 5% weight loss over 476°C under nitrogen. They can afford flexible and strong films with tensile strength of 82.1–93.3 MPa, elongation at break of 3.7%–15.2%, and Young's modulus of 3.3–3.8 GPa. Furthermore, The PI films exhibit good optical transparency with the cut-off wavelength at 313–366 nm and transmittance higher than 73% at 450 nm. The excellent thermal and optical transmittance can be attributed to synthesis method and the introduction of pyridine rings and ortho-methyl groups. The inherent viscosities of PIs via one-step method were found to be 0.58–1.12 dl g −1 in DMAc, much higher than those via two-step method. These results indicate these PIs could be potential candidates for optical substrates of organic light emitting diodes (OLEDs).

Highly efficient and stable dye-sensitized solar cells based on SnO2nanocrystals prepared by microwave-assisted synthesis

2012 ◽  
Vol 5 (1) ◽  
pp. 5392-5400 ◽  
Author(s):  
Alexander Birkel ◽  
Yong-Gun Lee ◽  
Dominik Koll ◽  
Xavier Van Meerbeek ◽  
Stefan Frank ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Microwave Assisted Synthesis ◽  
Dye Sensitized ◽  
Microwave Assisted ◽  
Highly Efficient ◽  
Sensitized Solar Cells
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