Substitution

Bài giảng Hoá hữu cơ A: Chương 3 cung cấp những kiến thức như thế ái nhân (Nucleophilic substitution – SN); thế ái điện tử (Electrophilic substitution – SE); cộng hợp ái nhân (Nucleophilic addition – AN); cộng hợp ái điện tử (Electrophilic addition – AE); tách loại (Elimination – E). Mời các bạn cùng tham khảo!

17p boghoado028 13-03-2024 9 2   Download

To achieve the aim, the first objective is preliminary experiments on preparation of polypropylene blends with silicone elastomer masterbatch and characterize by analysis of mass composition, mechanical properties, and dynamic mechanical properties to investigate any improvement of properties. The silicone elastomer masterbatch will then be substituted with propylene-maleic anhydride graft copolymer waxes or other compatibilizers.

147p runthenight05 01-03-2023 7 3   Download

This thesis analyses the Australian resources equity market reaction to the 2010 resource tax announcements. These taxes were explicitly designed to meet tax neutrality conditions. Tax neutrality implies that taxes should not incur substitution effects that result in economic inefficiency. These taxes were intended to generate revenue (i.e., an income effect) while not distorting economic incentives.

428p runthenight04 02-02-2023 11 2   Download

The experience of previous oil price shocks has shown that these shocks can provide an important catalyst for policies to encourage demand reduction, substitution to other fuels, and development of new sources of energy supply.

11p maingoc84 28-12-2022 34 4   Download

Research objectives of the thesis: Clarification influence of the elements Na, Sr and Ba substituting for La/Ca and crystal size on the magnetic properties, phase transition and magnetocaloric effects of La0,7Ca0,3MnO3 materials. Found the materials for significant mmagnetocaloric parameters have potential for applications in magnetic refrigeration.Determine the effect of replacing Sr/Ba for Ca in La0,7Ca0,3MnO3 and Co substituting for Mn in La0,7Sr0,3MnO3 on their critical behavior as well as the ferromagnetic interactions order.

31p extraenglish 24-05-2021 25 4   Download

In this thesis, using the data from the Viral Genome Resource at National Center for Biotechnology Informa-tion (NCBI), we propose the ROTA model that has been specifically estimated formodeling the evolution of rotavirus.

56p tamynhan0 04-07-2020 18 3   Download

To describe the alveolar cleft with clinical and radiographic features in patients with cleft lip and palate. To evaluate the bone resorption when using iliac bone, with platelet-rich plasma and bone substitutes.

24p cothumenhmong6 17-07-2020 32 2   Download

Influence of substitution of 3d metals for Mn on properties of La0.67Ca0.33Mn0.9 TM0.1O3 (TM = Fe, Co, Ni) compounds was studied. Ferromagnetic – paramagnetic and metals – insulator transitions were significantly affected by Mn-site substitution. However, no observable difference was found in their crystal structure from X-ray diffraction analysis. At room temperature the structure characterization of these compounds gave the single phase and structure is the distortion orthorhombic cell with space group symmetry Pnma.

12p 12120609 01-06-2020 13 2   Download

Preliminary experiments shows, that [3+2] cycloadditions reactions proceeds with full regioselectivity and high stereoselectivity. In consequence, 3,4-trans-2-methyl-3-(3,4,5-trimethoxyphenyl)-4-halo-4-nitroisoxazolidines are forming as predominantly (or sole) products. Additionally, prognosis for the synthesized compounds to be potential ingredients of drugs is good.

6p tocectocec 26-05-2020 22 1   Download

An effective and expeditious method of the synthesis of a highly functionalized piperidines, catalyzed by nontoxic, recyclable and environment friendly sodium lauryl sulfate (SLS), via one-pot multi-component condensation of aldehydes, amines and β-ketoesters in water at room temperature, has been developed.

8p tocectocec 25-05-2020 9 2   Download

Pentyl 2-(1H-indole-2-carboxamido)benzoate (5) is obtained in good yield as stable crystals by reaction of pentyl 2-amino benzoate (6) with indole-2-carbonyl chloride acid (7) in the presence of pyridine. The crystal structure of 5 confirms the presence of intramolecular hydrogen bonding (N-H…O) which produces a six-membered ring, and the molecules are linked together by intermolecular hydrogen forces (N-H…O).

6p tocectocec 25-05-2020 9 1   Download

The presence of heterocyclic moiety in diverse compounds, strongly indicative of the desired effect on physiological activity, and it reflects on efforts to find useful synthetic drugs.

12p tocectocec 25-05-2020 18 2   Download

A series of novel 5-Bromo-3-iodo-1H-pyrazolo[3,4-b]pyridine linked various sulfonamide derivatives 8a-8j poly functionalized were designed and synthesized in moderate to good yield.

10p tocectocec 25-05-2020 14 1   Download

Obtained by the interaction of 2-amino-3,3-dichloroacrylonitrile and chlorosulphonyl isocyanate (Z)-(5-(dichloromethylene)-2-oxoimidazolidin-4-ylidene)sulfamoyl chloride reacts easily with excess of the aliphatic amine to form new (Z)-N-(5-(dichloromethylene)-2-oxoimidazolidin-4-ylidene)-N'-substituted sulfonamides.

12p tocectocec 25-05-2020 9 1   Download

An environmentally benign aqueous protocol for the synthesis of novel 2-((5-(4-methoxybenzylidene)-4-oxo-4,5-dihydrothiazol-2-yl)amino)substituted acid by using potassium carbonate as a base has been achieved.

14p tocectocec 25-05-2020 10 0   Download

A series of novel 10-phenylsulfonyl-2-substituted-4,10 dihydrobenzo[4,5]imidazo[1,2- a]pyrimidin-4-one derivatives obtained from N-sulfonation of 2-substituted-pyrimido[1,2- a]benzimidazol-4(10H)-ones and screened for for their in vitro anti-tuberculosis activities against Mycobacterium tuberculosis H37Rv by Microplate Alamar Blue Assay (MABA) method.

8p tocectocec 25-05-2020 14 1   Download

In this paper, we have reviewed biological activities of natural and synthesized indolylimidazoles and their various synthetic methods.

20p tocectocec 25-05-2020 12 0   Download

A series of fourteen chalcone was synthesized via. Claisen–Schmidt condensation between substituted 2- hydroxyl acetonaphthones and substituted benzaldehyde in presence of tripotassium phosphate (K3PO4) catalyst.

16p tocectocec 25-05-2020 8 1   Download

The selective effects of these inhibitors are governed by substituent at position 5. Kinetic studies and molecular docking simulation were performed for elucidating mechanisms of enzyme-inhibitor complex formation.

12p tocectocec 25-05-2020 7 0   Download

Synthesis of 1, 2-disubstituted benzimidazoles by reaction of N-substituted benzene-1,2-diamine with different aldehydes was developed. This greener procedure proceeds with the help of oxygen in water at 60oC. The advantages of proposed method are catalyst-free conditions in water, short reaction time and excellent yields.

8p tocectocec 25-05-2020 9 0   Download