SYNTHESIS AND CHARACTERIZATION OF D-XYLOFURANOSE-5-PHOSPHATE

1955 ◽  
Vol 33 (4) ◽  
pp. 711-715 ◽  
Author(s):  
J. L. Barnwell ◽  
W. A. Saunders ◽  
R. W. Watson
Keyword(s):  
Acetic Acid ◽  
Glacial Acetic Acid ◽  
Synthesis And Characterization ◽  
Infrared Analysis ◽  
Barium Salt ◽  
Diphenyl Phosphate ◽  
Mild Hydrolysis

Phosphorylation of 1,2-O-isopropylidene-D-xylose with diphenylphosphoro-chloridate yielded crystalline 1,2-O-isopropylidene-D-xylofuranose-5-diphenyl-phosphate. Subsequent hydrogenolysis in glacial acetic acid over Adams' catalyst quantitatively removed phenyl groups as shown by infrared analysis. Mild hydrolysis in acetic acid for two hours at 80 °C. removed the isopropylidene grouping, and D-xylose-5-phosphate was isolated as an amorphous barium salt. A yield of 81% of theoretical was obtained from 1,2-O-isopropylidene-D-xylose, or an over-all yield of 72% from xylose. The product was characterized through its amorphous barium, disodium, and dipotassium salts, and its crystalline dibrucine and distrychnine salts.

scholarly journals Synthesis and Characterization of Some Novel Oxazine, Thiazine and Pyrazol Derivatives

2016 ◽  
Vol 13 (2) ◽  
pp. 244-252
Author(s):  
Baghdad Science Journal
Keyword(s):  
Acetic Acid ◽  
Ir Spectra ◽  
Glacial Acetic Acid ◽  
Basic Medium ◽  
Synthesis And Characterization ◽  
Pyrazole Derivatives ◽  
Phenyl Hydrazine ◽  
H Nmr ◽  
Ft Ir

In this paper, some chalcone derivatives (C1, C2) were synthesized based on the reaction of equal amount of substituted acetophenone and substituted banzaldehyde in basic medium. Oxazine and thiazine derivatives were prepared from the reaction of chalcones (C1-C2) with urea and thiourea respectively in a basic medium. Pyrazole derivatives were prepared based on the reaction of chalcones with hydrazine mono hydrate or phenyl hydrazine in the presence of glacial acetic acid as a catalyst. The new synthesized compounds were identified using various physical techniques like1 H-NMR and FT-IR spectra.

Synthesis and characterization of novel optically active poly(ester-imide-imine)s

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Abdol Reza Hajipour ◽  
Parniyan Roosta ◽  
Saeed Zahmatkesh ◽  
Arnold E. Ruoho
Keyword(s):  
Amino Acids ◽  
Acetic Acid ◽  
Glacial Acetic Acid ◽  
Optically Active ◽  
Synthesis And Characterization ◽  
Interfacial Polycondensation ◽  
Thermal Stabilities ◽  
Amino Phenol ◽  
High Yields

Abstract N,N´-(3,3´,4,4´-Benzophenonetetracarboxylic)-3,3´,4,4´-diimido-di-Lamino acids (1a-1d) and N,N´-pyromelliticdiimido-di-L-amino acids (2a-2d) are prepared from the reaction of 3,3´,4,4´-benzenetetracarboxylic-3,3´,4,4´- dianhydride or pyromellitic dianhydride with the corresponding L-amino acids in a solution of glacial acetic acid/pyridine (3:2) at refluxing temperature. 4-(4-((4- Hydroxyphenylimino)methyl)benzylidene amino) phenol (3) is prepared from 4- amino phenol and terephthaldialdehyde in refluxing ethanol. Interfacial polycondensation method was used to prepare the corresponding polymers (PEII1-8) in two immiscible solvents (water/dichloromethane). The resulting poly(esterimide- imine)s (PEIIs) having good inherent viscosities (0.13-1.25 dl g-1), optical activity and thermal stabilities is obtained in high yields.

scholarly journals Synthesis and Characterization of Novel Biginelli Dihydropyrimidinone Derivatives Containing Imidazole Moiety

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Mashooq Ahmad Bhat ◽  
Mohamed A. Al-Omar ◽  
Ahmed M. Naglah ◽  
Atef Kalmouch ◽  
Abdullah Al-Dhfyan
Keyword(s):  
Acetic Acid ◽  
Elemental Analysis ◽  
Efficient Method ◽  
Glacial Acetic Acid ◽  
Solvent Free ◽  
Synthesis And Characterization ◽  
Spectroscopic Methods ◽  
Free Condition ◽  
Solvent Free Condition

Enaminone, (2E)-1-[4-(1H-imidazol-1-yl) phenyl]-4-methylpent-2-en-1-one (II) was synthesized by refluxing 1-[4-(1H-imidazol-1-yl) phenyl] ethan-1-one (I) with dimethylforamide dimethylacetal (DMF–DMA) under solvent-free condition for 12 hours. Finally, the dihydropyrimidinone derivatives containing imidazole moiety (1–15) were obtained by reacting enaminone, (2E)-1-[4-(1H-imidazol-1-yl) phenyl]-4-methylpent-2-en-1-one (II) with urea and different substituted benzaldehydes in the presence of glacial acetic acid. Dihydropyrimidinone derivatives containing imidazole moiety were synthesized in excellent yield by means of a simple and efficient method. All the compounds were confirmed by elemental analysis. The structures of all the compounds were confirmed by modern spectroscopic methods.

scholarly journals Synthesis and characterization of new diacid monomers and poly (ester-imide) s: a study of thermal property relationship and solubility

2019 ◽  
Vol 10 (3) ◽  
pp. 1936-1941
Author(s):  
Ruaa Jameel Kamel ◽  
Mohammed Ali Mutar ◽  
Farah Safi Khlewee
Keyword(s):  
Acetic Acid ◽  
Carboxylic Acid ◽  
1H Nmr Spectroscopy ◽  
Glacial Acetic Acid ◽  
Dicarboxylic Acids ◽  
Synthesis And Characterization ◽  
Polymer Backbone ◽  
Loss Of Weight ◽  
Pyromellitic Anhydride

Two dicarboxylic acids [2,2'-(((4-hydroxyphenyl) methylene) bis (3-Bromo-4,1- phenylene)) bis (1,3 dioxoisoindoline 5 carboxylic acid)) and 2,2 '(((2,4dichlorophenyl) methylene) bis (4,1-phenylene)) bis (1,3-dioxoisoindoline-5-carboxylic acid)] were made by the reaction of pyromellitic anhydride (PMDA) with diamine in a solvent of g pyridine/glacial acetic acid at refluxing temperature. The organization of the diacid monomers is defined by FTIR and 1H-NMR spectroscopy. The sequence of new poly (ester-imide) s are arranged of two di acids and aromatic diols: [Bis (4hydroxyphenyl) 2 furelmethaneand 4,4'((1,4phenylene (methanylyidene)) bis (azanylylidene)) diphenol] by employing the polycondensation in the company of the dibutyltine dilaurate as a catalyst. The PEIs were defined by FTIR, 1HNMR, and TGA. Poly (ester-imide) s showed excellent solubility in polar aprotic solutions because of the existence of flexible groups in the polymer backbone. Furthermore, they displayed better thermal constancy, and the heat at that 10% loss of weight happened about700 to 800°C.                                                                                                                    

Solution Synthesis and Characterization of Aza-β3-peptides (Nα-Substituted Hydrazino Acetic Acid Oligomers)

2001 ◽  
Vol 66 (14) ◽  
pp. 4923-4929 ◽  
Author(s):  
Arnaud Cheguillaume ◽  
Arnaud Salaün ◽  
Sourisak Sinbandhit ◽  
Michel Potel ◽  
Philippe Gall ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Synthesis And Characterization ◽  
Solution Synthesis

scholarly journals Cyclodiene Chemistry. II. Identification of the Derivatives Employed in the Confirmation of Heptachlor, Heptachlor Epoxide, cis-Chlordane, and frans-Chlordane Residues

1969 ◽  
Vol 52 (5) ◽  
pp. 1100-1105
Author(s):  
W P Cochrane
Keyword(s):  
Acetic Acid ◽  
Glacial Acetic Acid ◽  
Allylic Alcohol ◽  
Heptachlor Epoxide ◽  
Addition Reactions ◽  
Unsaturated Alcohol ◽  
The Difference ◽  
Vinyl Derivatives ◽  
Alcohol Derivative

Abstract The effect of strong basic reagents on the title compounds was investigated. The dehydrochlorination of cis-chlordane proceeds rapidly to give 3-chlorochlordene, whereas its isomer, trans-chlordane, loses HCl very slowly to yield 2-chlorochlordene. The difference in rates of HCl elimination and the formation of isomeric chloro-vinyl derivatives is discussed with reference to the mechanisms of the reactions and the structures of the parent compounds. The action of basic reagents on heptachlor epoxide resulted in preferential epoxide isomerization (or rearrangement) to an allylic alcohol derivative. The structure of this α,β- unsaturated alcohol was elucidated from the characterization of the products formed by chlorination and oxidation. Ileptachlor undergoes substitution to give 1-hydroxychlordene in basic hydroxylic media. The addition reactions of tert.-butyl hypochlorite/glacial acetic acid to both heptachlor and aldrin are also mentioned.

scholarly journals Synthesis and Characterization of Titanium Supported on High Order Nanoporous Silica and Application for Direct Oxidation of Benzene to Phenol

2009 ◽  
Vol 6 (s1) ◽  
pp. S324-S328 ◽  
Author(s):  
Alireza Badiei ◽  
Javad Gholami ◽  
Yeganeh Khaniani
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Liquid Phase ◽  
Maximum Yield ◽  
Synthesis And Characterization ◽  
Nanoporous Silica ◽  
Radical Mechanism ◽  
Direct Oxidation ◽  
Oxidation Of Benzene

Direct oxidation of benzene to phenol in liquid phase by H2O2peroxide was examined over Ti/ LUS-1 catalyst in methanol and acetic acid as solvents. The maximum yield and selectivity of the phenol produced was obtained in the presence of acetic acid. It can be attributed to the stabilization of H2O2as peroxy acetic acid species in the radical mechanism for this reaction. Acetic acid interacts with hydrogen peroxide over Ti/LUS-1 and produces acetoxy radicals.

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