Tag: M.W=200-250

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 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

Kohga, Makoto published the artcileEffects of addition of surfactants on viscosity of uncured ammonium perchlorate/hydroxyl-terminated polybutadiene propellant, Formula: C14H31NO2, the publication is Kayaku Gakkaishi (1998), 59(4), 167-173, database is CAplus.

For the preparation of ammonium perchlorate (AP)/hydroxyl-terminated polybutadiene (HTPB) composite propellant, the lower viscosity of uncured propellant during mixing and casting is desirable. In this study, the effects ot the addition of 11 kinds of surfactants on the viscosity of an uncured propellant are investigated. Sodium lauryl sulfate is the most effective to decrease the viscosity of the AP/HTPB mixture The apparent viscosity of the AP/HTPB mixture with sodium lauryl sulfate can be made 30% lower than that of the AP/HTPB mixture alone. The optimum added amount of sodium lauryl sulfate is 0.005 wt% to HTPB, in order to obtain the sufficient effect of decreasing the viscosity of AP/HTPB mixture The apparent viscosity of AP/HTPB mixture can be decreased by the improvement of the wettability between AP and HTPB prepolymer. The addition of sodium lauryl sulfate is effective to decrease the apparent viscosity of uncured propellant and to delay the pot life.

Kayaku Gakkaishi published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, Formula: C14H31NO2.

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

Popiol, Justyna published the artcileThe involvement of xanthone and (E)-cinnamoyl chromophores for the design and synthesis of novel sunscreening agents, Related Products of catalysis-chemistry, the publication is International Journal of Molecular Sciences (2021), 22(1), 34, database is CAplus and MEDLINE.

In this study, seventeen novel mols. I [R¹ = H, 6-MeO, 7-Cl; R² = ([3-(2-chlorophenyl)prop-2-enoyl]oxy)methyl, ([3-phenylprop-2-enoyl]oxy)methyl, (3-([3-(4-methoxyphenyl)prop-2-enoyl]oxy)propoxy)methyl, etc.] by combining in the structures two chromophores: xanthone and (E)-cinnamoyl moiety were designed and synthesized. The UV spectroscopic properties of the tested compounds I were confirmed in chloroform solutions They acted as UVB or UVA/UVB absorbers. The most promising compound I [R¹ = 6-MeO, R² = ([3-(2,4-dimethoxyphenyl)prop-2-enoyl]oxy)methyl] absorbed UV radiation in the range 290-369 nm. Its photoprotective activity and functional photostability were further evaluated after wet milling and incorporation in the cream base. This tested formulation with compound I [R¹ = 6-MeO, R² = ([3-(2,4-dimethoxyphenyl)prop-2-enoyl]oxy)methyl] possessed very beneficial UV protection parameters (SPFin vitro of 19.69 ¡À 0.46 and UVA PF of 12.64 ¡À 0.32) which were similar as broad-spectrum UV filter tris-biphenyl triazine. Addnl., compound I [R¹ = 6-MeO, R² = ([3-(2,4-dimethoxyphenyl)prop-2-enoyl]oxy)methyl] was characterized by high values of critical wavelength (381 nm) and UVA/UVB ratio (0.830) thus it was a good candidate for broad-spectrum UV filter and it might protect skin against UVA-induced photoaging. Compound I [R¹ = 6-MeO, R² = ([3-(2,4-dimethoxyphenyl)prop-2-enoyl]oxy)methyl] were also shown to be photostable, non-cytotoxic at concentrations up to 50¦ÌM when tested on five cell lines and non-mutagenic in Ames test. It also possessed no estrogenic activity, according to the results of MCF-7 breast cancer model. Addnl., its favorable lipophilicity (miLogP = 5.62) does not predispose it to penetrate across the skin after topical application.

International Journal of Molecular Sciences published new progress about 16909-09-4. 16909-09-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ether, name is (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, and the molecular formula is C11H12O4, Related Products of catalysis-chemistry.

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

Wang, Yanliang published the artcileEffective removal of calcium and magnesium sulfates from wastewater in the rare earth industry, Formula: C12H16O3, the publication is RSC Advances (2019), 9(58), 33922-33930, database is CAplus and MEDLINE.

The wastewater discharged from the rare earth (RE) industry generally contains a high level of calcium and magnesium sulfates, which confers permanent hardness and causes difficulties in recycling this wastewater. In this study, the alkyl phenoxy acetic acid derivatives including 4-Me phenoxy acetic acid (M-POAA), 4-tert-Bu phenoxy acetic acid (B-POAA) and 4-tert-octyl phenoxy acetic acid (O-POAA), were synthesized via the Williamson reaction and characterized by NMR (NMR), IR (IR), and ultra-violet (UV) spectroscopy, as well as elemental anal. and X-ray diffraction (XRD). Synthesis of the POAAs were simple and green, and the raw materials used for their production are widely available and low-cost. The potential for removal of Ca and Mg sulfates from industrial wastewater using POAAs as the organic precipitants was assessed. The total precipitation efficiencies of Ca and Mg from wastewater with the use of POAAs increased with the following order: M-POAA < B-POAA < O-POAA. The residual concentrations of Ca and Mg using O-POAA as the precipitant were lower than 0.099 and 0.089 g L^-1, resp. The O-POAA could be regenerated five times without any significant change in its structure and precipitation performance. Thus, the use of the novel precipitants is a prospective alternative to the conventional processes for softening wastewater.

RSC Advances 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 C18H35NO, Formula: C12H16O3.

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

Cartledge, Emily M. published the artcileReplacing Synperonic N in the physical developer fingermark visualisation process: Pseudo-operational trial and parameter studies, Category: catalysis-chemistry, the publication is Forensic Science International (2021), 110916, database is CAplus and MEDLINE.

A reformulated phys. developer (PD) solution has been devised to replace the use of Synperonic N for environmental reasons. The performance of the replacement solution has proved promising in laboratory trials using planted fingermarks [1] however; this may not always represent how a reagent works on real world samples. This paper therefore explores the effectiveness of the decaethylene glycol monododecyl ether (DGME)-based PD formulation through a pseudo-operational trial. A range of naturally handled, porous substrates were processed, which totalled over 600 samples that had been previously treated with amino acid reagents (1,2-indandione (IND) or 1,8-diazafluoren-9-one (DFO) and ninhydrin). The trial was representative of the operational use of PD at the end of a processing sequence for porous exhibits. The results from the trial establish that DGME is an effective replacement detergent for Synperonic N in PD solutions and demonstrated the added benefit of using PD as a sequential treatment. Planted mark studies to assess the parameters of the DGME-based PD formulation are also included in this paper. These studies explored the preparation, processing and storage temperature required for the solution as well as the shelf life. The effectiveness of DGME-based PD on items that have been previously wetted was also investigated. These studies show the formulation is suitable for use in an operational laboratory and is therefore an effective replacement formulation for the Synperonic N-based PD.

Forensic Science International published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, Category: catalysis-chemistry.

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

Thomas-Wilson, Amelia published the artcileReplacing Synperonic N in the Physical Developer fingermark visualization process: Reformulation, COA of Formula: C14H31NO2, the publication is Forensic Science International (2021), 110786, database is CAplus and MEDLINE.

The Phys. Developer solution currently recommended for use in the United Kingdom for fingermark visualization uses two surfactants: n-dodecylamine acetate (nDDAA) and Synperonic N. Synperonic N is covered by the EU directive 82/242/EEC, which sought to phase out chems. with degradation products more harmful than their precursor. This study explores the replacement of Synperonic N with alternative detergents and examines their ability to produce clear, stable solutions that are effective at developing fingermarks. The critical properties of the detergents were investigated, such as the critical micelle concentration and the hydrophilic-lipophilic balance, and planted mark comparisons were performed on promising formulations. Tween 20 was deemed unsuitable due to the production of cloudy solutions and the requirement to age the formulation to improve effectiveness. Brij C10 produced clear formulations; however, these were too stable causing unacceptably long exhibit processing times, and an addnl. preparation stage was necessary. Brij L23, Brij S10, Igepal CO-630, Polyoxyethylene (10) tridecyl ether and Tergitol 15-S-9 also proved to be unsuccessful alternatives. Decaethylene glycol monododecyl ether (DGME) was found to be a suitable alternative to Synperonic N and depletion series experiments suggested that a range of DGME and nDDAA detergent quantities were effective at developing marks. The processing time using DGME was similar to Synperonic N and the most favorable ratio of reagents is proposed in this paper as a reformulated Phys. Developer solution

Forensic Science International published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C4Br2N2O4S, COA of Formula: C14H31NO2.

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

Lahnif, Hanane published the artcileHybrid Chelator-Based PSMA Radiopharmaceuticals: Translational Approach, Related Products of catalysis-chemistry, the publication is Molecules (2021), 26(21), 6332, database is CAplus and MEDLINE.

Prostate-specific membrane antigen (PSMA) has been extensively studied in the last decade. It became a promising biol. target in the diagnosis and therapy of PSMA-expressing cancer diseases. Although there are several radiolabeled PSMA inhibitors available, the search for new compounds with improved pharmacokinetic properties and simplified synthesis is still ongoing. In this study, we developed PSMA ligands with two different hybrid chelators and a modified linker. Both compounds have displayed a promising pharmacokinetic profile. DATA5m.SA.KuE and AAZTA5.SA.KuE were synthesized. DATA5m.SA.KuE was labeled with gallium-68 and radiochem. yields of various amounts of precursor at different temperatures were determined Complex stability in phosphate-buffered saline (PBS) and human serum (HS) was examined at 37 ¡ãC. Binding affinity and internalization ratio were determined in in vitro assays using PSMA-pos. LNCaP cells. Tumor accumulation and biodistribution were evaluated in vivo and ex vivo using an LNCaP Balb/c nude mouse model. All experiments were conducted with PSMA-11 as reference DATA5m.SA.KuE was synthesized successfully. AAZTA5.SA.KuE was synthesized and labeled according to the literature. Radiolabeling of DATA5m.SA.KuE with gallium-68 was performed in ammonium acetate buffer (1 M, pH 5.5). High radiochem. yields (>98%) were obtained with 5 nmol at 70 ¡ãC, 15 nmol at 50 ¡ãC, and 60 nmol (50 ¦Ìg) at room temperature [68Ga]Ga-DATA5m.SA.KuE was stable in human serum as well as in PBS after 120 min. PSMA binding affinities of AAZTA5.SA.KuE and DATA5m.SA.KuE were in the nanomolar range. PSMA-specific internalization ratio was comparable to PSMA-11. In vivo and ex vivo studies of [177Lu]Lu-AAZTA5.SA.KuE, [44Sc]Sc-AAZTA5.SA.KuE and [68Ga]Ga-DATA5m.SA.KuE displayed specific accumulation in the tumor along with fast clearance and reduced off-target uptake. Both KuE-conjugates showed promising properties especially in vivo allowing for translational theranostic use.

Molecules published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, Related Products of catalysis-chemistry.

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

Xue, Yulan published the artcileRecovery of gallium from neutralization precipitates by flotation, Related Products of catalysis-chemistry, the publication is Shigen to Sozai (1989), 105(12), 945-9, database is CAplus.

Ga(OH)₃, which was conventionally obtained as a residue of Zn hydrometallurgy, floated completely in water with a collector of Na dodecylsulfate (SDS) at pH 4-7.0 and did not float entirely with a dodecylammonium acetate (DAA) collector in the same conditions, while Ga(OH)₃ in an aqueous solution saturated with gypsum floated to some extent with either of the collectors. Because gypsum was quite floatable in these conditions, some depressants for the selective flotation of Ga(OH)₃ from gypsum were used and soluble starch and gum arabic were effective as a depressant for Ga(OH)₃ in DAA flotation. When DAA was used as a collector and soluble starch or gum arabic was added as a depressant, Ga(OH)₃ was effectively separated from gypsum and 91% of Ga(OH)₃ was kept in the tailing.

Shigen to Sozai published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C7H7BF2O3, Related Products of catalysis-chemistry.

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