physical techniques in the synthesis of organic compounds

... [36], as well as acetyl cholinest-erase inhibition for the treatment of Alzheimer’s disease [37, 38] In continuation of the author’s research work [39–45], the synthesis of some new thiazoles, 1,3,4-thia-diazoles ... ampicillin and gentamicin Scheme 2 Synthesis of compounds (6, 7, 10a, 10b, 11a and 11b) Trang 5According to these results, we can suggest the follow-ing structure activity relationships: A In the ... 1,3,4-oxadiazole-2-thiole ring at position 5 in the thiazole ring showed a mod-erate antimicrobial activity for all microorgan-isms in Table 1 Scheme 4 Synthesis of compounds (15) and (20a–d) Trang 7Scheme 5 Synthesis

Ngày tải lên: 29/05/2020, 13:32

... that these compounds are powerful tools in organic chemistry The main target of this review is to outline some of the reactivepeculiarities that make this class of compounds powerful tools in the ... groups.6 In spite of theirimportance, methods for the direct synthesis of these types of heterocycles are quite limited.7,8 With thisaim, our group and others investigated for over 25 years the usefulness ... of carban-the heterocyclic rings (five-membered and six-membered rings) and carban-the number of heteroatoms in carban-thegiven molecule regardless of the site of attack by the reagent There are,

Ngày tải lên: 12/01/2022, 23:58

... improved by the addition of risk factor variables to the modelling process Trang 326 1.7 OTHER FINDINGS Other findings in this study include the following:  Misclassification rate alone is an insensitive ... reviews the application of data mining methods in the medical domain with reference to the difficulties in the use of medical data Also addressed is the use of physiological trend and other clinical ... addresses the process of data mining, in particular the use of time-series analyses in the setting of automatically collected anaesthesia related time-series data This chapter addresses as well the

Ngày tải lên: 07/08/2017, 15:52

... Friedel–Crafts acylation of acylanilides using excess of AlCl3 afforded the corresponding ketones in low yields due to the loss of the catalytic activity of the Lewis acid in the presence of the basic nitrogen ... role in organic synthesis and are known as important groups for anticancer therapy [1-9] Among these, 4-aminobenzophenones are known as the precursors for the synthesis of a wide range of benzothiazole ... presence of many types of Lewis bases [31] Initially, we examined the reaction and the activity of metal triflates with aniline as the starting material and benzoyl chloride as the acylating agent

Ngày tải lên: 16/12/2017, 00:12

... Forbagline Derivatives Forbaglines are benzo[b]oxepines naturally occurring in the genus Aglaia, in whichthe pyran ring of the aglains is replaced by an oxepine ring The benzo[b]oxepineskeleton of the ... Class of Anti-inflammatory Compounds 62 1.3 Structural Features of Ascomycin 66 2 Synthesis Aspects 70 2.1 Synthesis of the Four Diastereomeric “Furano-Ascomycins” 70 2.2 Synthesis of13C ... acid, the bifunctional amine 2-aminopyrrolidine,and 2-methylbutanoic acid (in odorine), 2-hydroxy-2-methylbutanoic acid (inodorinol) or 2-methylpropanoic acid (in piriferine) In 33 of the total of

Ngày tải lên: 14/03/2018, 15:21

... He then joinedthe Weizmann Institute of Science, Israel, as a Postdoctoral Fellow of the FeinbergGraduate School and worked in the group of Professor Ehud Keinan for a period ofthree years in the ... elaboration of coumarinolignans is thedetermination of the exact mode of linkage of the phenylpropanoid unit to thecoumarin nucleus or, in other words, to decide which of two possible regioisomersthe ... remaining aromaticprotons differ depending on the oxygen substituents in the phenyl ring Thechemical shifts of different hydrogens of some coumarinolignans are shown inAn intriguing problem in the

Ngày tải lên: 15/03/2018, 11:10

... with the increase in the Na/Cu ratio The increase in the ratio to 2.1 increased the longitudinal size to 950 nm The addition of NaOH was considered to increase the amounts of Naþand OHions in the ... solution The increase in the Na/Cu ratio resulted in an increase in ionic strength of the solution in a ratio range larger than the stoichiometric ratio of 2.0 The increase in ionic strength made the ... show EBSD-determined inverse polefigure maps in the directions of the x, y, and z axes, respectively They were obtained by analyzing the back scattering intensity in the directions inFig 10(b) Each

Ngày tải lên: 17/03/2021, 20:21

... Trang 1Industrial University of Ho Chi Minh City Faculty of Chemical Engineering COMPLEX CATALYST Mid-term Report A HIGHLY ACTIVE COPPER-BASED METAL-ORGANIC FRAMEWORK CATALYST ... ACTIVE COPPER-BASED METAL-ORGANIC FRAMEWORK CATALYST FOR A FRIEDEL–CRAFTS ALKYLATION IN THE SYNTHESIS OF BIS(INDOLYL)METHANES UNDER ULTRASOUND IRRADIATION HVTH: Nguyễn Thị Hương GVHD: TS Võ Thành ... MOF-891 và nghiên cứu xúc tác DEF/H 2 O Cu(NO ) ₃)₂ ₂ H 6 CPB MOF-891 Rửa với DMF 85 °C 16 h Nung 150 °C trong 24 h Trao đổi dung môi trong 3 ngày MeOH 1 Indole 2 Benzaldehyde 3 m-xylene 4 MOF-891

Ngày tải lên: 26/04/2022, 15:06

... Forbagline Derivatives Forbaglines are benzo[b]oxepines naturally occurring in the genus Aglaia, in whichthe pyran ring of the aglains is replaced by an oxepine ring The benzo[b]oxepineskeleton of the ... Class of Anti-inflammatory Compounds 62 1.3 Structural Features of Ascomycin 66 2 Synthesis Aspects 70 2.1 Synthesis of the Four Diastereomeric “Furano-Ascomycins” 70 2.2 Synthesis of13C ... acid, the bifunctional amine 2-aminopyrrolidine,and 2-methylbutanoic acid (in odorine), 2-hydroxy-2-methylbutanoic acid (inodorinol) or 2-methylpropanoic acid (in piriferine) In 33 of the total of

Ngày tải lên: 22/05/2022, 14:44

... developing their skills The scientific novelty of the qualification paper is determined by the necessity of the study of the main methods and techniques of writing tostudents The methods used in the ... is to study the function of writing techniques and teaching main methods of writing The object of investigation in our qualification is main methods and techniques of teaching writing to students ... understudy in perusing their story, utilize the clear side of the paper to compose the interpretation of their story in the best possible structure Go over the interpretation of the story with the understudy

Ngày tải lên: 18/10/2022, 04:50

... bonding in the high-TCuO sample involves the size effect Sintering of particles takes place intensively for small particles because of the size effect related to the decreaein the melting point ... increased in the range of 0.2-0.6 M The Cu2O was contained in the particles for 0.2 and 0.4 M Removal of O from the Cu oxide probably took place during bonding at 400oC in H2 gas The amount of ... EBSD-determined inverse pole figure maps in the directions of the x, y, and z axes, respectively They were obtained by analyzing the back scattering intensity in the directions in Fig 10 (b)

Ngày tải lên: 26/07/2023, 07:40

... Synthesis of 1i 26 Scheme 2.3 Synthesis of 1k and 1l 27 Scheme 2.4 Synthesis of 1p 27 Scheme 2.5 Synthesis of 1j 27 Scheme 2.6 Synthesis of 1m 28 Scheme 2.7 Synthesis of 1q 28 Scheme 2.8 Synthesis ... One-pot synthesis of 1,2,3,4-thiatriazoles 9 Scheme 1.16 Synthesis of sultams from o-nitrochalcones 9 Scheme 1.17 Willgerodt-Kindler-like synthesis of benzoxazoles 10 Scheme 1.18 Synthesis of quinoxaline-2-thiones ... Committee and Dean of Faculty of Chemical Engineering after the thesis being corrected (if any) CHAIRMAN OF THESIS COMMITTEE CHEMICAL ENGINEERING DEAN OF FACULTY OF Assoc Prof Dr Tran Hoang Phuong

Ngày tải lên: 25/10/2023, 22:12

... incorporation of lignin into the chitosan films decreases their transmittance; and, interestingly, the spectra profile differs depending on the lignin concentration All films containing lignin ... lignin which is considered as a crucial factor in determining the antioxidant action of lignin [140] As the concentration of lignin in the film increased, the radical scavenging activity increased ... was found to be independent of the lignin concentration, implying that the addition of lignin in the composite did not affect the thickness of obtained films The data presented in Table 4-1 suggests

Ngày tải lên: 22/05/2024, 11:18

... β-amyrin, highlighting the contribution of angiosperms, including dandelion (Taraxacum officinale) Additionally, certain oils contain 1,3,6,7-tetramethylnaphthalene, further indicating the complex ... similar to the 1-methyl- and 1,3-dimethylindans Notably, the concentration of 2-methyltetralin was approximately double that of 1-methyltetralin Additionally, in the case of the indans, the cis-336 ... biomarkers indicating both biological origins and depositional environments, with specific alkanes being indicative of lacustrine or marine phytoplankton and certain tropical marine settings.Non-marine

Ngày tải lên: 25/03/2025, 10:56

... presenting the study’s context, explaining its theoretical basis, formulating the main research questions, setting objectives and content, defining the scope, and outlining the overall structure of ... data processing methods by effectively integrating remote sensing technologies with machine learning algorithms, thereby strengthening the scientific basis of the research These combined tools ... accessibility, particularly in mountainous areas and primary forests In particular, Bac Kan province, a mountainous inland area in the center of the Northeast region of Vietnam, exhibited the highest national

Ngày tải lên: 06/09/2025, 21:59

... of the paint layer, the characteristic touche of the author, the eventual existence of an underlying painting, the pentimenti, the alterations, the restorations, the modifications of frame, the ... origin (Burmese) of inlay rubies of the alabaster Parthe Ishtar statue (~200 BC) held in the custody of the Louvre Museum [99] (Fig 4(AC)), mapping of inclusions in gemstones [100,101], of pigments ... materials For example: what are the origins of the yellow, red and black pigments of parietal paintings of the Magdalenian era in the caves of the Pyrenees? How were synthetic Egyptian blue and green...

Ngày tải lên: 22/03/2014, 09:20

... War Memorial The photograph of the original painting was taken by the author in the course of her investigations, and is not an official reproduction of the painting (ART40317) in the Australian ... of the painting, showing the location of pigments of different types used by the artist [The image of the painting of an Australian soldier by Ivor Hele was taken with the permission of the Australian ... available), the overall performance depends on the packing of the detector elements o The overall detection efficiency of the detector depends on the packing of the pixels, the coupling of the array...

Ngày tải lên: 06/12/2015, 10:58

... number of works increased in the years from 2000 to 2010 The obtained carbons were mainly employed in the removal of water pollutants In the present chapter the principal methods used in the preparation ... according with the following equation, (1) where W0 is the weight of the original carbon and W1 refers to the mass of the activated carbon The use of CO2 during the activation process of a carbon ... combination of techniques In this chapter, some of the more common techniques used in the characterization of activated carbons are shown 38 Lignocellulosic Precursors Used in the Synthesis of...

Ngày tải lên: 28/06/2014, 17:20

... Printing inks 50 % Paints and coatings 25 % Other 5% Plastics 20 % Figure 1.5: Main uses of organic pigments The remaining organic pigments (“Other”) are used in textile printing and a number of ... take into account the specific characteristics of the manufacture of Organic Fine Chemicals Using the results of the BREF on CWW as a source of information, the BREF on OFC provides a further ... application medium In colouring, the crystalline pigment is applied in the solid state, not in the dissolved form, to the medium being coloured Both the chemical and the physical properties of the pigments...

Ngày tải lên: 05/03/2014, 20:20

... the functioning of e-commerce and Internet marketing and selling techniques in the retail of goods Table 12: Consumer survey – Perceived savings while buying online or offline28 Online shopping ... on the functioning of e-commerce and Internet marketing and selling techniques in the retail of goods • Many consumers research information on products and prices offline and then buy them online: ... welfare gains under a hypothetical situation in which the share of Internet retailing in the EU would be 15% of total retailing This benchmark of 15% of total retailing to assess the “missing potential”...

Ngày tải lên: 23/03/2014, 08:21