Month: December 2022

Zaouri, Noor published the artcileInteractions between model organic compounds and metal oxides, COA of Formula: C10H10O3, the publication is Colloids and Surfaces, A: Physicochemical and Engineering Aspects (2021), 126858, database is CAplus.

Because of their mech., thermal, and chem. resistance, ceramic materials are suitable for challenging water treatments, where different metal oxides (MeO) have been tested as active layers. However, organic fouling is a major drawback impacting its performance. Organics adsorb onto the membrane surface and into their pores during long-term operation, resulting in irreversible fouling. This investigation focussed on the interfacial interactions between model organic acids and MeO to obtain a fundamental understanding of the adsorption phenomena. Batch adsorption experiments of a series of small mol. weight, oxygenated, aromatic organic acids were performed with Al₂O₃, TiO₂, and ZrO₂ particles, at pH 4.2 and 7.6. The adsorption of simple acids was described by the Langmuir model and exhibited a strong dependence on the relative abundance of carboxyl groups, aliphaticity/aromaticity, alkyl chain length, and presence of hydroxyl groups. The adsorption of model compounds was higher at low pH and decreased with increasing pH. The difference in Al₂O₃, TiO₂, and ZrO₂ surface characteristics, as evidenced by TEM, XRD, and BET, led to differences in the adsorption d. The results obtained with these well-defined organic structures will assist in better understanding the interfacial interactions between complex natural organic matter mols. and MeO of different characteristics.

Colloids and Surfaces, A: Physicochemical and Engineering Aspects published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is C15H21BO3, COA of Formula: C10H10O3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Sheremeteva, T. V. published the artcileFormation and strength of amide and imide bonds, Category: catalysis-chemistry, the publication is Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya (1966), 695-700, database is CAplus.

cf. CA 56, 4615g. Heating aqueous solutions of the arylamides of citraconic acid results in competing reactions of cyclization to imides and hydrolysis of the amide bond; the predominance of the reactions is determined by basicity of the initial amine. The greater is the electron-acceptor ability of the amine, the more readily hydrolyzed is the amide bond and the more active is the H atom on N group; monoamides of citraconic acid formed by weak amines, such as nitroaniline, suffered mainly hydrolysis of the amide group in hot aqueous medium (72% hydrolysis in 16 hrs. at 100¡ã was noted) while cyclization to the imide was feasible only in EtOH solution (22% in 16 hrs. heating) and this reaction was facilitated by removal of H₂O from the reaction mixture, so that with added P₂O₅ the imide yield rose to 44% in 16 hrs. heating. Amines with somewhat greater basicity (PhNH₂, glycine residues) underwent cyclization to imides in aqueous solution at 100-10¡ã by 63-88% and the imide rings were relatively more stable to hydrolysis. When cyclization is inhibited by introduction of a 2nd substituent at N atom, the resulting N-amide bond is easily hydrolyzed at 100¡ã when it contains aryl and alkyl groups, while the N,N-dialkylamino group in the amides remains intact; the low level of activity of the H atom in the alkyl amides is the reason for the need to use high temperature (140-200¡ã) for cyclization of such amides. Citraconic anhydride treated with Ph-NHEt in Et₂O gave in 2-3 hrs. N-ethylcitraconanilide, m. 108¡ã; similarly were prepared the N,N-dimethylamide, m. 105¡ã; anilide, m. 170¡ã; p-nitroanilide, m. 159¡ã. Citraconylaminoacetic acid in aqueous KOH was evaporated to yield 70% KO₂CCH:CMeCONHCH₂CO₂K, m. 203-4¡ã; this with AgNO₃ gave the di-Ag salt. The di-K salt above neutralized with 2N H₂SO₄ and heated in a sealed tube 16 hrs. at 100¡ã gave 53.3% citraconylaminoacetic acid, m. 127¡ã, as the free carboxymethylenamide of citraconic acid could not be isolated from aqueous solution owing to facile cyclization. Kinetic curves were presented for the rate of cyclization in aqueous solution and the following order of facility of imide formation was found for amides of citraconic acid (decreasing ease of cyclization): anilide, carboxymethylenamide, p-nitroanilide. Heating the anilide in H₂O 16 hrs. resulted in 88% cyclization to the imide, m. 98¡ã; a kinetic curve of the reaction was shown. p-Ni-troanilide similarly treated gave a low yield of the p-nitrophenyl-imide, m. 146¡ã.

Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C9H7NO4, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Solov’eva, I. A. published the artcilePreparation of secondary aromatic and aliphatic aromatic amines via the Smiles rearrangement, COA of Formula: C12H9N3O4, the publication is Zhurnal Organicheskoi Khimii (1968), 4(11), 1973-9, database is CAplus.

The easily accessible amides p-O2NC6H4-OCH2CONHR [where R is Me, Et, PhCH2, Ph, ¦Á-naphthyl, ¦Â-naphthyl, p-PhC6H4, o-PhC6H4, p-ClC6H4, p-O2NC6H4, o-Et2NC6H4, p-HO2CC6H4, o-MeOC6H4, o-HO2CC6H4, 2,5-HO2C(O2N)C6H4, or 4,2-Cl(HO2C)C6H4] undergo Smiles rearrangement and give amines p-O2NC6H4NHR (R as above). Under the same reaction conditions m-O2NC6H4OCH2CONHR or PhOCH2CONHR (where R is Me, Et, PhCH2, or Ph) decompose to m-O2NC6H4OCH2CO2H and NH2R. o-O2NC6H4-OCH2CONH2 or p-O2NC6H4OCH2CONH2 give only very low yields of the corresponding nitroanilines; the disubstituted amides o-O2NC6H4OCH2CONRR1 or p-O2NC6H4OCH2-CONNR1 do not rearrange.

Zhurnal Organicheskoi Khimii published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C6H8O6, COA of Formula: C12H9N3O4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Kumar, Naresh published the artcileAnti-oxidation properties of 2-substituted furan derivatives: A mechanistic study, HPLC of Formula: 104-03-0, the publication is Journal of Luminescence (2021), 117725, database is CAplus.

2-(P-Ph substituted styryl)-furans were synthesized and studied the excited state and anti oxidation properties using absorption, fluorescence, d. functional theory and DPPH radical scavenging assay. 2-(P-hydroxy Ph styryl)-furan (6) exhibits good antioxidant properties with IC₅₀ ? 40¦ÌM as compared to the amine, chloro, cyano methoxy and nitro substituted styryl compounds (1-5, 7-8) (IC₅₀ > 150¦ÌM). It is shown that furans 1-3 with strong electron withdrawing nitro, cyano and chloro substituent do not show antioxidant properties. The O-H bond dissociation energy (BDE) of p-hydroxy substituted furan compound is comparable to the BDE of vitamin E. The antioxidant activity of furan compound is further reduced with increasing the dipolar nature of the mol. From the thermodn. parameters and antioxidant properties, it is shown that there is a correlation of antioxidant properties with the ground state dipole moment, X-H bond dissociation energy (X: O; N) and proton affinity (PA). In presence of the furan compound, the quenching of DPPH radical is occurred predominantly through hydrogen atom transfer mechanism.

Journal of Luminescence published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C8H7NO4, HPLC of Formula: 104-03-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Adhikari, Birendra Babu published the artcileComplexation and extraction behavior of trivalent indium with multiple proton ionizable p-t-butylcalix[5]arene pentacaarboxylic acid derivative: a new efficient solvent extraction reagent for indium, Formula: C12H16O3, the publication is Journal of Inclusion Phenomena and Macrocyclic Chemistry (2011), 71(3-4), 479-487, database is CAplus.

Complexation behavior of a plural ion-exchangeable p-t-butylcalix[5]arene pentacarboxylic acid derivative towards trivalent In was studied along with its monomeric analog from weakly acidic media into CHCl₃. The cyclic structure of calixarene ligand providing certain cavity and cooperativity of functional groups significantly affect the complexation behavior and the calixarene derivative is an excellent extractant over monomeric analog. The extraction mechanism is ion exchange and carboxylic acid groups are adequate functional sites for extraction Mononuclear and/or polynuclear species of In and monomeric or bridged dimeric species of calixarene are involved in complexation and the composition of extracted complex varied with solution pH. One mole of calix[5]arene derivative tend to extract 3.5 mol of In. The loaded In was quant. back extracted with 1 mol dm^-3 HCl solution

Journal of Inclusion Phenomena and Macrocyclic Chemistry published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Formula: C12H16O3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Adhikari, Birendra Babu published the artcileCation complexation with p-tert-butylcalix[5]arene pentacarboxylic acid derivative: An allosteric regulation of the first metal ion for stepwise extraction of the second ion, Safety of 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Analyst (Cambridge, United Kingdom) (2011), 136(18), 3758-3769, database is CAplus and MEDLINE.

A calix[5]arene based solvent extraction reagent 3, appending carboxylic acid groups at the lower rim, has been developed and its complexation behavior towards some transition metal ions has been studied. The host 3 can selectively and quant. extract Pb(2+) ions above pH 1.8 while other divalent ions such as Cu(2+), Zn(2+), Co(2+), Ni(2+) are extracted quant. only above pH 3.0. The outstanding Pb(2+) selectivity of 3 comes from the size fit complementarity effect of the Pb(2+) ion in the calix[5]arene cavity. One mol. of 3 extracts two Pb(2+) ions in a stepwise manner. The first Pb(2+) ion is extracted into the deep cavity of the calix[5]arene defined by phenoxy oxygen atoms. The first complexed Pb(2+) ion acts as a template to bring the host into a cone conformation and induces a pos. allosteric effect for the extraction of the second Pb(2+) ion at an oxygen rich coordinating site composed of carboxyl groups. Both the Pb(2+) ions are extracted through an ion exchange mechanism and the electroneutral complex in the organic phase is formed by the release of an equivalent number of hydrogen ions into aqueous solution The loaded Pb(2+) is easily back-extracted from Pb(2+)-complexed 3 using dilute acid solution

Analyst (Cambridge, United Kingdom) published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Safety of 2-(4-(tert-Butyl)phenoxy)acetic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Adhikari, Birendra Babu published the artcileMultiple proton ionizable calixarene derivatives with different ring sizes and complexation ability as efficient ionophores for complexation and solvent extraction of trivalent indium, Category: catalysis-chemistry, the publication is Analyst (Cambridge, United Kingdom) (2011), 136(21), 4570-4579, database is CAplus and MEDLINE.

The solvent extraction behavior of multiple proton ionizable p-tert-butylcalix[4]arene and [6]arene carboxylic acid derivatives towards indium was studied along with an acyclic monomeric analog from weakly acidic media into chloroform. The extraction mechanism is ion exchange and carboxylic acid groups are adequate ligating sites for extraction The cyclic structure of calixarene ligands to accommodate the potential guest species and the cooperativity effect of multifunctional groups significantly affect the complexation behavior and calixarene derivatives are excellent extractants over the monomeric analog. The composition of the extracted complex depends on the solution pH and attempts to determine the composition of the extracted complex for the extraction of indium were stymied by complications arising from the formation of polynuclear species of indium and bridged polymeric species of calixarene carboxylic acid derivatives One mole of calix[4]arene derivative extracts 2.5 mol of indium whereas the calix[6]arene derivative tends to extract 4.0 mol of indium. The loaded indium is back extracted with 1 mol dm^-3 hydrochloric acid solution Though quant. back extraction of indium was achieved from the fully loaded calix[6]arene derivative, it was only achieved up to 85% in the case of the calix[4]arene derivative

Analyst (Cambridge, United Kingdom) published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Category: catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Adhikari, Birendra Babu published the artcileExtraction of Pb²⁺ with p-tert-butylcalix [4]-, [5]-, [6]Arene Carboxylic Acid Ligands and their Monomeric Counterpart: A Thermodynamic Approach, Safety of 2-(4-(tert-Butyl)phenoxy)acetic acid, the publication is Solvent Extraction and Ion Exchange (2013), 31(5), 483-498, database is CAplus.

Studies on extraction equilibrium constants at different temperatures and thermodn. parameters of solvent extraction of Pb²⁺ ion with carboxylic acid derivatives of different ring size calixarenes and structure related monomeric compound have been carried out. The extraction equilibrium constants corresponding to calix[n]arene (n = 4, 5, 6) derivatives decrease in the order [5]arene > [6]arene > [4]arene. In all cases, the complexation process is primarily enthalpy driven. The favorable enthalpic contribution for extraction of Pb²⁺ is in the order hexamer ¡Ö monomer > tetramer > pentamer. However, the unfavorable entropic loss follows the order: monomer > hexamer > tetramer > pentamer. Overall stability of the host-guest complex is the function of entropy-enthalpy compensation and the free energy of complexation is min. for the pentamer, followed by tetramer ¡Ö hexamer and monomer. Although the carboxylic acid derivative of calix[4]arene is more preorganized than the calix[5]arene derivative, extraction of Pb²⁺ ion with the tetramer passes through greater entropic loss than that with the pentamer and the degree of preorganization of calix[4]arene derivative is far from perfect for the complexation and extraction of Pb²⁺ ion. As compared to tetrameric and hexameric counterparts, the structural features of the carboxylic acid derivative of calix[5]arene prior to complexation contribute much to interact with the Pb²⁺ ion and form a thermodynamically stable complex. Supplementary materials are available for this article. Go to the publisher’s online edition of Solvent Extraction and Ion Exchange to view the supplemental file.

Solvent Extraction and Ion Exchange published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C12H16O3, Safety of 2-(4-(tert-Butyl)phenoxy)acetic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Ahmed, Riyaz published the artcileTCT-mediated click chemistry for the synthesis of nitrogen-containing functionalities: conversion of carboxylic acids to carbamides, carbamates, carbamothioates, amides and amines, SDS of cas: 118-90-1, the publication is Organic & Biomolecular Chemistry (2022), 20(24), 4942-4948, database is CAplus and MEDLINE.

Reported a s-trichlorotriazine (TCT, also known as cyanuric chloride) mediated one-pot general method for the conversion of carboxylic acids into ubiquitous functionalities such as carbamides, carbamates, carbamothioates, amides and amines. The TCT-mediated activation of acids followed by azidation and heating led to the isocyanate formation via Curtius rearrangement which involved click chem. in the presence of nucleophiles and provided the coupled product. The TCT were employed at ¡Ü40 mol% with respect to the starting materials; however, its bulk availability and low cost provide a unique opportunity towards its applicability in the synthesis of functional mols. The optimized conditions was successfully demonstrated for gram scale synthesis and late-stage functionalization of natural products and drugs such as podophyllotoxin, eugenol, diosgenin, geraniol and fluvoxamine.

Organic & Biomolecular Chemistry published new progress about 118-90-1. 118-90-1 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Natural product, name is 2-Methylbenzoic acid, and the molecular formula is C8H8O2, SDS of cas: 118-90-1.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Srivastava, Apurva K. published the artcileStudies in development of immunoassays: Part I. Synthesis of 3,4-trans-2,2-dimethyl-3-(m-hydroxyphenyl)-4-[p-(pyrrolidinoethoxy)phenyl]-7-methoxychroman-BSA conjugate, an immunogen of centchroman, Application of 2-(3-(Benzyloxy)phenyl)acetic acid, the publication is Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry (1994), 33B(7), 671-3, database is CAplus.

The synthesis of 3,4-trans-2,2-dimethyl-3-(m-hydroxyphenyl)-4-[p-(pyrrolidinoethoxy)phenyl]-7-methoxychroman-bovine serum albumin (BSA) conjugate I, an immunogen for antibody production against centchroman, has been carried out. Thus, diphenylcoumarin II was methylated, alkylated with ¦Â-pyrrolidinoethyl chloride, hydrogenated, and isomerized to give I.

Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C8H19NO2, Application of 2-(3-(Benzyloxy)phenyl)acetic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia