Tag: M.W=200-250

Shamsipur, Mojtaba published the artcileHighly selective and sensitive membrane sensors for copper(II) ion based on a new benzo-substituted macrocyclic diamide 5,6,7,8,9,10-hexahydro-2H-1,13,4,7,10-benzodioxatriazacyclopentadecine-3,11(4H,12H)-dione, Application of 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Electroanalysis (2007), 19(5), 587-596, database is CAplus.

Novel PVC membrane (PME) and coated graphite (CGE) Cu²⁺-selective electrodes based on 5,6,7,8,9,10-hexahydro-2H-1,13,4,7,10-benzodioxatriazacyclopentadecine-3, 11(4H,12H)-dione were prepared The electrodes reveal a Nernstian behavior over wide Cu²⁺ ion concentration ranges (1.0 ¡Á 10^-7 – 1.0 ¡Á 10^-1 M for PME and 1.0 ¡Á 10^-8 – 1.0 ¡Á 10^-1 M for CGE) with very low limits of detection (7.8 ¡Á 10^-8 M for PME and 9.1 ¡Á 10^-9 M for CGE). The potentiometric responses are independent of the pH of the test solutions in the pH range 2.7-6.2. The proposed electrodes possess very good selectivities for Cu²⁺ over a wide variety of the cations including alkali, alk. earth, transitions and heavy metal ions. The practical utility of the proposed electrodes were demonstrated by their use in the study of interactions between Cu ions and human growth hormone (hGH) in biol. systems, potentiometric titration of Cu with EDTA and determination of Cu content of a sheep blood serum sample and some other real samples.

Electroanalysis published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C8H5F3N4, Application of 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Golchoubian, Hamid published the artcileHalochromism, ionochromism, solvatochromism and density functional study of a synthesized copper(II) complex containing hemilabile amide derivative ligand, Formula: C16H20N2, the publication is Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (2015), 913-924, database is CAplus and MEDLINE.

This study investigates chromotropism of newly synthesized 3,3′-(ethane-1,2-diylbis(benzylazanediyl))dipropanamide copper(II) perchlorate complex. The compound was structurally characterized by physico-chem. and spectroscopic methods. X-ray crystallog. of the complex showed that the copper atom achieved a distorted square pyramidal environment through coordination of two amine N atoms and two O atoms of the amide moieties. The pH effect on the visible absorption spectrum of the complex was studied which functions as pH-induced “off-on-off” switches through protonation and deprotonation of amide moieties along with the Cu-O to Cu-N bond rearrangement at room temperature The complex was also observed to show solvatochromism and ionochromism. The distinct solution color changes mainly associated with hemilability of the amide groups. The solvatochromism of the complex was investigated with different solvent parameter models using stepwise multiple linear regression method. The results suggested that the basicity power of the solvent has a dominant contribution to the shift of the d-d absorption band of the complex. D. functional theory, DFT calculations were performed in order to study the electronic structure of the complex, the relative stabilities of the Cu-N/Cu-O isomers, and to understand the nature of the halochromism processes taking place. DFT computational results buttressed the exptl. observations indicating that in the natural pH (5.8) the Cu-O isomer is more stable than its linkage isomer and conversely in alk. aqueous solution

Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy 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, Formula: C16H20N2.

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

Adib, Mehdi published the artcileA novel synthesis of 3-aryl-2,6-dicyano-5-methylanilines via reaction between nitrostyrenes and malononitrile, COA of Formula: C10H11NO4, the publication is Synthesis (2010), 1526-1530, database is CAplus.

A novel and simple synthesis of 3-aryl-2,6-dicyano-5-methylanilines is described. Reactions between nitrostyrenes and excess malononitrile in the presence of sodium carbonate in 80% ethanol proceeded at room temperature to afford the aromatic products in good yields. A mechanism for the formation of the products is proposed.

Synthesis published new progress about 4230-93-7. 4230-93-7 belongs to catalysis-chemistry, auxiliary class Alkenyl,Nitro Compound,Benzene,Ether, name is 1,2-Dimethoxy-4-(2-nitrovinyl)benzene, and the molecular formula is C10H11NO4, COA of Formula: C10H11NO4.

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

Shapiro, B. L. published the artcileNMR spectral data: a compilation of aromatic proton chemical shifts in mono- and di-substituted benzenes, Computed Properties of 312-40-3, the publication is Journal of Physical and Chemical Reference Data (1977), 6(3), 919-91, database is CAplus.

NMR chem. shifts for protons directly attached to mono- and disubstituted benzenes are compiled from the literature. Data for 1053 sets of data are presented. The data were examined for reliability by using criteria which include high spectral quality, rigorous exptl. technique, and sufficient description to assure correct interpretation of results. The data, presented in tabular form, include compound name and formula, solvent employed, concentration, temperature, chem. shift, and observation frequency. Other NMR-related data are not given. An author index is included. The data and references cover the literature to June 1976.

Journal of Physical and Chemical Reference Data published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C13H17BClFO2, Computed Properties of 312-40-3.

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

Shcheglova, M. K. published the artcileScreening of bacteria degrading surface-active substances, Quality Control of 2016-56-0, the publication is Antibiotiki i Khimioterapiya (1989), 34(3), 192-4, database is CAplus and MEDLINE.

A procedure for detection of bacteria degrading cationic surface-active substances (CSAS) was developed. The procedure is based on the color of pyrocatechin violet, an organic dye, changing from green-blue in the presence of CSAS to red-brown in its absence. After application of pyrocatechin violet to bacterial macrocolonies grown on a synthetic medium with a CSAS as the only source of C, red-brown zones develope around the colonies, which is indicative of CSAS degradation A total of 55 strains of bacteria degrading undecylpyridinium bromide were isolated from water and sewage purification plants. Six bacterial strains degraded all 9 surfactants tested. Degradability was related to the presence of a long C chain, with branching, and a substituent in the aromatic ring. The procedure may be used for the rapid determination of degradation of CSASs with different chem. structures.

Antibiotiki i Khimioterapiya 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 C10H20O2, Quality Control of 2016-56-0.

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

Chakravarti, Duhkhaharan published the artcileSynthesis of coumarins from ¦Ï-hydroxyaryl alkyl ketones. IV. Formation of ¦Ï-coumaric acids from ¦Ï-hydroxy aldehydes, Computed Properties of 16909-09-4, the publication is Journal of the Indian Chemical Society (1943), 338-40, database is CAplus.

cf. C. A. 34, 6252.7. Reformatski¨« reactions of some 2-methoxybenzaldehydes gave HO esters which on dehydration and hydrolysis yielded trans-¦Ï-coumaric acids. It was shown that 2-MeO aldehydes, always lead to trans-¦Ï-methoxycinnamic acids by Perkin’s reaction, by malonic acid condensation, and by the method of Chakravarti and Majumdar (Reformatski¨«) (cf. C. A. 34, 2348.9). A mixture of 8 g. 5,2-Me(MeO)C₆H₃CHO (I), 13.4 g. BrCH₂CO₂Et (II), 5.5 g. Zn wool and 75 cc. anhydrous benzene was heated at 100¡ã for 2.5 h. and poured into ice-cold dilute H₂SO₄. After washing and drying, the benzene layer was distilled, yielding 5.5 g. of Et ¦Â-hydroxy-¦Â-(2-methoxy-5-methylphenyl)propionate, b₁₂ 200¡ã, which was converted by treating with 3 g. SOCl₂ and 3 g. pyridine in 100 cc. anhydrous Et₂O into 3.8 g. Et 2-methoxy-5-methyl-trans-cinnamate (III), b₇ 165¡ã. Hydrolysis of III with alc. KOH gave the free trans acid (IV), m. 145-6¡ã, which was identical with the compound obtained in good yield by heating 1 g. I with 2 g. Ac₂O and 8 g. fused AcONa at 180¡ã for 10 h., extracting with alkali and acidifying with HCl. Similarly I was converted by Reformatski¨«’s reaction with Zn and MeCHBrCO₂Et (V) to the corresponding HO ester which was dehydrated with SOCl₂ and pyridine to Et ¦Á-methyl-2-methoxy-5-methylcinnamate (VI), b₅ 160¡ã. Alc. KOH hydrolysis of VI gave the trans acid, m. 109-10¡ã, identical with the acid obtained by heating I with EtCO₂Na and (EtCO)₂O. By the same series of reactions the following compounds were prepared: Et 2,4-dimethoxycinnamate, brown viscous liquid, b₆ 160¡ã (trans acid (VII), m. 184¡ã); Et ¦Á-methyl-2,4-dimethoxycinnamate, viscous brown liquid, b₆ 200¡ã (trans acid (VIII), m. 130¡ã); Et ¦Â-(2-methoxy-1-naphthyl)acrylate, b₄ 210-2¡ã; (free acid (IX), m. 153-4¡ã); Et ¦Á-methyl-¦Â-(2-methoxy-1-naphthyl)acrylate, viscous brown liquid, b₅, 220-5¡ã (free acid (X), m. 138-9¡ã). VII, VIII, IX, and X were also prepared by Perkin’s reaction and were compared with those compounds prepared above by mixed m. ps. In addition, condensation of 2,4-(MeO)₂C₆H₃CHO with malonic acid in the presence of piperidine also yielded the trans acid (VII). III or IV, heated with HI (d. 1.7) at 140¡ã for 2 h., yielded only a sticky precipitate which could not be crystallized No ring closure was effected.

Journal of the Indian Chemical Society 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, Computed Properties of 16909-09-4.

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

Vitali, Alberto published the artcile¦Â-glucosyltransferase in cell cultures of Verbesina caracasana, Safety of (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, the publication is Heterocycles (1999), 50(2), 721-730, database is CAplus.

(E)-3,4-Dimethoxycinnamic acid, inoculated in cell cultures of Verbesina caracasana, was converted to the corresponding ¦Â-glucopyranoside ester, revealing the presence of an exoglucosyltransferase. An extensive study on other cinnamic acid derivatives showed that the aromatic ring must contain at least one methoxy substituent, but no hydroxy group, for the esterification to be performed. Moreover, the presence of the double bond was shown to have no influence. The glucosylation reaction may involve also the hydroxyl of benzyl alcs., with the same specificity towards the substitution of the aromatic ring as shown by the cinnamic acids.

Heterocycles 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 C23H20BN, Safety of (E)-3-(2,4-Dimethoxyphenyl)acrylic acid.

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

Roversi, Elena published the artcileSubstituent effect on the competition between hetero-Diels-Alder and cheletropic additions of sulfur dioxide to 1-substituted 1,3-butadienes, Safety of Allyldiphenylphosphine oxide, the publication is Helvetica Chimica Acta (2002), 85(3), 733-740, database is CAplus.

The reactivity of sulfur dioxide toward variously substituted butadienes was explored in an effort to define the factors affecting the competition between the hetero-Diels-Alder and cheletropic additions At low temperature (<-70¡ã), 1-alkyl-substituted 1,3-dienes that can adopt s-cis-conformations add to SO₂ in the hetero-Diels-Alder mode in the presence of CF₃COOH as promoter. In the case of (E)-1-ethylidene-2-methylidenecyclohexane, the [4+2] cycloaddition of SO₂ is fast at -90¡ã without acid catalyst. (E)-1-(Acyloxy)-1,3-butadienes also undergo the hetero-Diels-Alder addition with SO₂+CF₃COOH at low temperatures, giving a 1:10 mixture of the corresponding cis- and trans-6-(acyloxy)sultines. Above -50¡ã, the sultines undergo complete cycloreversion to the corresponding dienes and SO₂, which that add in the cheletropic mode at higher temperature to give the corresponding 2-substituted sulfolenes. The hetero-Diels-Alder additions of SO₂ follow the Alder endo rule, giving first the 6-substituted cis-sultines that equilibrate then with the more stable trans-isomers. This statement is based on the assumption that the S=O group in the sultine prefers a pseudo-axial rather than a pseudo-equatorial position, as predicted by quantum calculations The most striking observation is that electron-rich dienes , such as 1-cyclopropyl-1,3-butadiene, 1-phenyl-1,3-butadiene, 1-(4-methoxyphenyl)-1,3-butadiene, 1-(trimethylsilyl)-1,3-butadiene, 1-phenoxy-1,3-butadiene, 1-(4-chlorophenoxy)-1,3-butadiene, 1-(4-methoxyphenoxy)-1,3-butadiene, 1-(4-nitrophenoxy)-1,3-butadiene, 1-(2-naphthalenyloxy)-1,3-butadiene, 1-(methylthio)-1,3-butadiene, 1-(phenylthio)-1,3-butadiene, 1-[(4-chlorophenyl)thio]-1,3-butadiene, 1-[(4-methoxyphenyl)thio]-1,3-butadiene 1-[(4-nitrophenyl)thio]-1,3-butadiene, and 1-(phenyl-seleno)-1-1,3-butadiene, as well as 1-(methoxymethylene)-2-methylenecyclohexane do not equilibrate with the corresponding sultines between -100¡ã and -10¡ã in the presence of large excess of SO₂, with or without acidic promotor. The hetero-Diels-Alder additions of SO₂ to 1-substituted (E)-1,3-butadienes are highly regioselective, giving exclusively the corresponding 6-substituted sultines. The 1-substituted (Z)-1,3-butadienes do not undergo the hetero-Diels-Alder additions with sulfur dioxide.

Helvetica Chimica Acta published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Safety of Allyldiphenylphosphine oxide.

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

Manley, David W. published the artcileCatalyst-Free Photoredox Addition-Cyclisations: Exploitation of Natural Synergy between Aryl Acetic Acids and Maleimide, Category: catalysis-chemistry, the publication is Chemistry – A European Journal (2014), 20(18), 5492-5500, database is CAplus and MEDLINE.

Suitably functionalized carboxylic acids undergo a previously unknown photoredox reaction when irradiated with UVA in the presence of maleimide. Maleimide was found to synergistically act as a radical generating photoxidant and as a radical acceptor, negating the need for an extrinsic photoredox catalyst. Modest to excellent yields of the product chromenopyrroledione, thiochromenopyrroledione and pyrroloquinolinedione derivatives were obtained in thirteen preparative photolyses. In situ NMR spectroscopy was used to study each reaction. Reactant decay and product build-up were monitored, enabling reaction profiles to be plotted. A plausible mechanism, whereby photo-excited maleimide acts as an oxidant to generate a radical ion pair, has been postulated and is supported by UV/Vis. spectroscopy and DFT computations. The radical-cation reactive intermediates were also characterized in solution by EPR spectroscopy.

Chemistry – A European Journal 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

He, Chun-Yang published the artcilePalladium-Catalyzed Aerobic Dehydrogenative Cross-Coupling of Polyfluoroarenes with Thiophenes: Facile Access to Polyfluoroarene-Thiophene Structure, Product Details of C9H9F5Si, the publication is Organometallics (2012), 31(4), 1335-1340, database is CAplus.

Pd-catalyzed aerobic dehydrogenative cross-coupling of polyfluoroarenes with thiophenes via 2-fold C-H functionalization. E.g., reaction of pentafluorobenzene with 1-(thiophen-2-yl)ethanone in the presence of 5 mol% Pd(OAc)₂/Ag₂O and 1 atm of O₂ with 0.4 equivalent of pivalic acid in DMF/DMSO at 120¡ã to give an 81% yield of 1-(5-(perfluorophenyl)thiophen-2-yl)ethanone. The advantages of this reaction are its high reaction efficiency, excellent functional group compatibility, and use of mol. O₂ as terminal oxidant. This reaction provides a useful and facile protocol for the preparation of polyfluoroarene-thiophene structure of interest in functional materials. Mechanistic studies revealed that the reaction is initiated by the C-H bond cleavage of polyfluoroarenes.

Organometallics published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, Product Details of C9H9F5Si.

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