Substituent effects on the antioxidant capacity of monosubstituted diphenylamines: A DFT studyThere are undesirable effects leading to considerable changes in the properties of polymers and plastics since exposing to oxygen undergo oxidative degradation. Therefore, investigation of the bond dissociation enthalpies (BDEs) of NH bond for a series of monosubstituted diphenylamines is great interest. In this study, DFT-based method B3P86/6-...
10 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 189 | Lượt tải: 0
Secondary metabolites from a marine sponge-associated fungus Xenomyrothecium sp. IMBC-FP2.11In the study, seven compounds were isolated from an EtOAc extract of the marine-derived fungal strain Xenomyrothecium sp. IMBC-FP2.11, including (3R,4R)-4-hydroxymellein (1), (3R,4S)-4-hydroxymellein (2), trans-3,4- dihydro-3,4,8-trihydroxynaphtalen-1(2H)-one (3), (3S)-6-hydroxy-8-methoxy-3,5-dimethyl-isochroman (4), 8-hydroxy- 6-methyl-9-oxo-9H...
7 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 245 | Lượt tải: 0
Phenolic compounds from Trigonostemon honbaensis and their cytotoxic activitySeven phenolic compounds including (±)-erythro-1-(3,4,5-trimethoxyphenyl)propane-1,2-diol (1), (±)-threo-1- (3,4,5-trimethoxyphenyl)propane-1,2-diol (2), (R)-3-3-(3,4-dimethoxyphenyl)propane-1,2-diol (3), (±)-3-(3,4,5- trimethoxyphenyl)propane-1,2-diol (4), (+)-syringaresinol (5), (7S,8R,8′R)-5,5′-dimethoxylariciresinol (6), juniperosi...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 199 | Lượt tải: 0
A new xanthone from the lichen Parmotrema praesorediosum (Parmeliaceae)Two xanthone compounds, praesorexanthone A (1) and praesorexanthone B (2), were isolated from the lichen Parmotrema praesorediosum (Nyl.) Hale (Parmeliaceae). Among them, praesorexanthone B is a new natural compound. Their chemical structures were unambiguously determined by the analysis of 1D and 2D NMR and high resolution ESI mass spectroscopi...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 646 | Lượt tải: 0
Chemical composition of pyrolysis oil through thermal decomposition of sugarcane biomassThe process of thermal decomposition of sugarcane biomass consists of 4 stages. On that basis, the research conducted the pyrolysis of sugarcane biomass to collect liquid products at different temperature stages and they were analyzed by GC-MS method to determine the chemical composition. Chemical composition of pyrolysis oil through thermal dec...
9 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 205 | Lượt tải: 0![Development of Green protocols for the synthesis of 1H-benzo[d]imidazolo aryl amide derivatives and evaluation of their biological activity](https://s2.doan.edu.vn/q1p3es2a3ogg3sdmy5p5fwak3sva1ttz/thumb/2022/06/19/development-of-green-protocols-for-the-synthesis-of-1h-benzo_5QbRUUTlz1.jpg)
Development of Green protocols for the synthesis of 1H-benzo[d]imidazolo aryl amide derivatives and evaluation of their biological activityBenzimidazole scaffold containing chemical derivatives show superior biological activity. In view of this, we synthesized a combination of benzimidazole and aryl amides. The target compounds (6a-j) were synthesized using ethyl 3-iodobenzoate and benzimidazole as starting materials under microwave conditions. The synthesized compounds were screen...
6 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 258 | Lượt tải: 0
Compatibility of epoxidized natural rubber and polyaniline blendThe compatibility of binary blend of epoxidized natural rubber and polyaniline was investigated. Epoxidized natural rubber with 25 mol% of epoxy group content was prepared through epoxidation of deproteinized natural rubber in latex stage. Blends of epoxidized natural rubber and polyaniline with various ratios were prepared. The compatibility of...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 204 | Lượt tải: 0
Sulfanilic acid catalysed one-pot three-component Mannich reaction for synthesis of β-amino ketonesWe have reported sulfanilic acid as an exceedingly competent catalyst for one-pot Mannich reaction to give β- amino carbonyl compounds in good to excellent yield within a short reaction time. The various organic acids have screened; like gallic acid, 4-hydroxy benzoic acid, 4-amino benzoic acid, phenylacetic acid, chloroacetic acid, sulfosalicyl...
13 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 179 | Lượt tải: 0
Highly effective photocatalyst of TiO₂ nanoparticles dispersed on carbon nanotubes for methylene blue degradation in aqueous solutionIn the present study, titania nanoparticles are highly dispersed on carbon nanotubes via hydrolysis process of tetraisopropyl-orthotitanate Ti[OCH(CH3)2]4 (TPOT). The obtained composite (TiO2/CNTs) is characterized by modern methods. The anatase-TiO2 phase is realized based on X-ray diffraction spectrum at different pHs of hydrolysis solution. Th...
12 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 209 | Lượt tải: 0
Effect of stabilizing and brightening agents and some operated conditions on electroplating kinetics of NiCu alloys from citrate-sulfate solutionsThe effect of stabilizing and brightening additives, temperature and stirring on electrodeposited kinetics of NiCu alloy has been studied by the linear polarization method. The additives almost do not affect on the electrochemical reduction rate of Cu2+ ions, however it has a much affect on the reduction rate of Ni2+ ions. The presence of boric a...
5 trang | Chia sẻ: thuyduongbt11 | Ngày: 17/06/2022 | Lượt xem: 210 | Lượt tải: 0
