Results 81 to 90 of about 15,169 (208)

Studies of Vanadyl Complexes of Phthalic Acid and Substituted Phthalic Acids

open access: yes, 1977
Department of Chemistry, S. B. E. S. College of Science, Aurangabild-481 001 Manuscript received 23 August 1976 ; revised 1 June 1977 ; accepted 3 October 1977 The interactions of vanadyl ion with phthalic acid and 3-chloro, 3-bromo, 3-iodo, 3-nitro, 4-nitro and 3 : 6-dichlorophthalic acids have been investigated by Bjerrum-Calvin pH-titration ...
openaire   +1 more source

Study of improved resins for advanced supersonic technology composites. Part 1: Heteroaromatic polymers containing ether groups. Part 2: Curing chemistry of aromatic polymers and composite studies [PDF]

open access: yes
Fourteen ether-containing, aromatic dianhydrides have been synthesized from N-phenyl-3 or 4-nitrophthalimide and various bisphenols. The process involves nucleophilic displacement of activated nitro groups with bisphenolate ions.
Hillig, W. B.   +2 more
core   +1 more source

Ring-opening copolymerization (ROCOP): synthesis and properties of polyesters and polycarbonates [PDF]

open access: yes, 2015
Controlled routes to prepare polyesters and polycarbonates are of interest due to the widespread application of these materials and the opportunities provided to prepare new copolymers. Furthermore, ring-opening copolymerization may enable new poly(ester–
Brooks, R   +5 more
core   +1 more source

Synthesis and Anticancer Activity of Some New S-Glycosyl and S-Alkyl 1,2,4-Triazinone Derivatives

open access: yesMolecules, 2011
A series of S-glycosyl and S-alkyl derivatives of 4-amino-3-mercapto-6-(2-(2-thienyl)vinyl)-1,2,4-triazin-5(4H)-one (1) were synthesized using different halo compounds such as preacetylated sugar bromide, 4-bromobutylacetate, 2-acetoxyethoxy-methyl ...
Hosam A. Saad, Ahmed H. Moustafa
doaj   +1 more source

Comparison of three methods for the methylation of aliphatic and aromatic compounds [PDF]

open access: yes, 2017
Rationale: Methylation protocols commonly call for acidic, hot conditions that are known to promote organic ^1H/^2H exchange in aromatic and aliphatic C—H bonds.
Feakins, Sarah J.   +6 more
core   +2 more sources

Preparation and Biological Activities of Some Heterocyclic Compounds Derivatives from 2-Aminothiazoles

open access: yesNano Biomedicine and Engineering, 2018
In the current investigation, two series of 2-amino thiazole derivatives were prepared. The first series involved synthesis of (Z)-3-(thiazol-2-ylimino)indolin-2-one (A1) as Schiff base derivatives of 2-amino thiazole and isatin, then synthesis of ...
Faez Abdul-hussein Alrammahi
doaj   +1 more source

Oxalic acid as a heterogeneous ice nucleus in the upper troposphere and its indirect aerosol effect [PDF]

open access: yesAtmospheric Chemistry and Physics, 2006
Heterogeneous ice freezing points of aqueous solutions containing various immersed solid dicarboxylic acids (oxalic, adipic, succinic, phthalic and fumaric) have been measured with a differential scanning calorimeter.
B. Zobrist   +13 more
doaj  

Long-term (2001–2013) observations of water-soluble dicarboxylic acids and related compounds over the western North Pacific: trends, seasonality and source apportionment

open access: yesScientific Reports, 2017
To better understand the impact of East Asian pollutants on the molecular composition of marine organic aerosols, we conducted long-term (2001–2013) observations of water-soluble dicarboxylic acids and related compounds in total suspended particulate ...
Suresh K. R. Boreddy   +2 more
doaj   +1 more source

Kinetics of the reactions of the acid anhydrides with aromatic amines in aprotic solvents [PDF]

open access: yes
Work has revealed that diamine derivatives of diphenylmethane (IV), diphenyl ether (V), benzophenone (IV), fluorene (VII), and fluorenone (VIII) polymerizations with pyromellitic dianhydride in DMA were dependent on the basicity of the amine compound ...
Mason, J. G., Sugg, E.
core   +1 more source

Condensation of anhydrides or dicarboxylic acids with compounds containing active methylene groups. Part 1: Condensation of phthalic anhydride with acetoacetic and malonic ester [PDF]

open access: yes
Phthalic anhydride was condensed with acetoacetic ester in acetic anhydride and triethylamine solution, and when phthalyl chloride was reacted with sodium acetoacetic ester compounds were formed of the phthalide and indandione series: phthalylacetoacetic
Oshkaya, V. P., Vanag, G. Y.
core   +1 more source

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