122352-12-9Relevant academic research and scientific papers
Solution processable polyamides containing thiazole units and thioether linkages with high optical transparency, high refractive index, and low birefringence
Javadi, Ali,Shockravi, Abbas,Kamali, Mahmood,Rafieimanesh, Atefeh,Malek, Ali M.
, p. 3505 - 3515 (2013)
A series of new organic-soluble polyamides (PAs) bearing flexible thioether linkages and heteroaromatic thiazole units were synthesized from a novel thioether-bridged diamine monomer (DA) and various commercially available aromatic dicarboxylic acids (1-5) via a direct polycondensation method. The resulting polymers were obtained in high yields and possessed inherent viscosities in the range of 0.41-0.80 dL g-1. All of the polymers were amorphous in nature, exhibited good solubility and could be easily dissolved in amide-type polar aprotic solvents and even dissolved in less polar solvents (e.g., tetrahydrofuran, pyridine, and acetone). They showed excellent thermal stability with glass transition temperatures between 207 and 239°C and 10% weight loss temperatures in excess of 424°C in nitrogen and 469°C in air atmosphere. The optical transmittances of the PA films at 450 nm were higher than 85% for the thickness of ～10 μm. The combination of the thiazole moieties and flexible thioether linkages provided PAs with high average refractive indices (nav) of 1.7414-1.7542 and low birefringences (Δn) of 0.0061-0.0087 at 632.8 nm. In particular, the nav of PA-5 derived from DA and 2,2′-dithiodibenzoic acid exhibited the highest refractive index (1.7542) in the high refractive index PAs.
A novel schiff base ligand and its Ni(II) complex: synthesis and characterization
Gharamaleki, Jafar Attar,Bolouhari, Houra Sadat,Goodarzi, Atousa,Javadi, Ali,Notash, Behrouz
, p. 2073 - 2081 (2016)
Abstract: In this paper, synthesis of a novel Schiff base ligand based on bis(2-amino-4-pheny1-5-thiazolyl)disulfide and its corresponding Ni(II) complex was reported. This ligand was prepared through the formation of an imine bond between 2-hydroxy-1-naphthaldehyde and bis(2-amino-4-phenyl-5-thiazol)disulfide in absolute methanol as solvent. The characterizations were performed by FT-IR, 1H NMR, 13C NMR, elemental analysis, and single crystal X-ray analysis. In the molecular structure, the ligand possessed anti-conformation around –S–S– bond and monomeric moieties were linked into the chains through the C–H?O and π?π interactions. The reaction of the synthesized ligand with NiCl2 in methanol afforded the corresponding Ni(II) complex. The resulting product was further investigated by thermal gravimetric and differential thermal analysis, which confirmed the formation of desired polymeric complex. The electrochemical behavior and formation of Ni(II) complex in dimethyl sulfoxide (DMSO) solution were investigated by means of cyclic voltammetry and UV–Vis titration, respectively. Graphical abstract: [Figure not available: see fulltext.]
A one-pot synthesis of 2-aminothiazoles via the coupling of ketones and thiourea using I2/dimethyl sulfoxide as a catalytic oxidative system
Zhang, Qian,Wu, Jiefei,Pan, Zexi,Zhang, Wen,Zhou, Wei
, p. 89 - 94 (2020/06/17)
A series of 2-aminothiazoles is prepared in moderate-to-good yields by the direct coupling of ketones and thiourea using I2/dimethyl sulfoxide as a catalytic oxidative system. This method avoids the preparation of lachrymatory and toxic α-haloketones and the use of an acid-binding agent, thus providing a more convenient approach to 2-aminothiazoles compared to the Hantzsch reaction.
Arginine-based surface modification of nanostarch, a catalytic carbohydrates in synthesis of heteroaryl sulfides
Zarnegar, Zohre,Monjezi, Homeyra Rostami,Safari, Javad
, p. 14 - 23 (2019/05/24)
Novel arginine-functionalized starch-based nanoparticles (Arg-SNPs)were synthesized and characterized by Fourier transforms infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX), X-ray diffraction (
A Novel Sulfidation Reaction and Its Application to Some 4-Aryl-2-aminothiazoles
Dhindsa, G. S.
, p. 191 - 192 (2007/10/02)
A novel one-pot synthesis of bis(2-amino-4-aryl-5-thiazolyl)sulphides (1-5) has been achieved by reacting appropiate 4-aryl-2-aminothiazole with thiourea and elemental iodine at room temperature.The identity of compounds (1-5) is further confirmed by conv
