Tag: M.W=150-200

Maleki, Ali; Panahzadeh, Morteza; Eivazzadeh-keihan, Reza published the artcile< Agar: a natural and environmentally-friendly support composed of copper oxide nanoparticles for the green synthesis of 1,2,3-triazoles>, Reference of 611-19-8, the main research area is magnetic agar support copper oxide preparation thermal stability; alkyne benzyl halide sodium azide copper catalyst dipolar cycloaddition; benzyl triazole regioselective preparation green chem.

A novel, green and cost-effective heterogeneous nanocatalyst was synthesized by supporting copper (I) oxide nanoparticles on magnetic agar (Cu2O/Agar@Fe3O4). Then, it was characterized with multiple techniques, such as SEM and transmission electron microscopy images, energy-dispersive X-ray anal., Fourier-transform IR (FT-IR) spectroscopy, thermogravimetric (TG) anal., X-ray diffraction pattern, vibrating sample magnetometer curve, and inductively coupled plasma anal. The catalytic activity of the newly designed catalyst was investigated in a one-pot three-component reaction of alkyl halides, sodium azide and alkynes to obtain 1,4-disubstituted 1,2,3-triazoles in high yields in water-ethanol media. The present catalyst was simply separated from the reaction media by an external magnet and reused at least five subsequent runs without significant activity loss.

Green Chemistry Letters and Reviews published new progress about 1,3-Dipolar cycloaddition catalysts (regioselective). 611-19-8 belongs to class chlorides-buliding-blocks, and the molecular formula is C7H6Cl2, Reference of 611-19-8.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Dunn, Collin A.; Shi, Zhangxing; Zhou, Rongfei; Gin, Douglas L.; Noble, Richard D. published the artcile< (Cross-Linked Poly(Ionic Liquid)-Ionic Liquid-Zeolite) Mixed-Matrix Membranes for CO2/CH4 Gas Separations Based on Curable Ionic Liquid Prepolymers>, Application of C9H9Cl, the main research area is carbon dioxide methane separation ionic liquid polymer zeolite membrane.

A three-component (crosslinked poly(ionic liquid) (PIL)-ionic liquid (IL)-zeolite), mixed-matrix membrane (MMM) platform based on curable IL prepolymers of controlled length has been developed for separating CO2 from CH4. Solutions of these curable prepolymers demonstrate increased resistance to support penetration compared to comparable solutions of analogous cross-linkable IL monomers. By adjusting the curable IL prepolymer chain length, it is possible to manipulate polymer susceptibility to support penetration, polymer solution gelation time, and gas separation performance in MMMs based on these materials. When a 50 wt % solution of the curable IL prepolymer with a d.p. (x) of 87 was cast on an ultrafiltration support membrane, only 3.7 wt % of the polymer penetrated into the support. As the d.p. of the curable IL prepolymer increases, the CO2/CH4 gas separation performance of the resulting MMM performance also improves. For example, an MMM synthesized using 64 wt % curable IL prepolymer (x = 87), 16 wt % [EMIM][Tf2N] as the IL, and 20 wt % SAPO-34 zeolite exhibited a CO2/CH4 selectivity of (42 ± 5) and a CO2 permeability of (47 ± 1) barrers. This CO2/CH4 separation performance is comparable to the previous generation of MMMs based on curable small-mol. IL monomers with the same IL and zeolite. However, this new MMM system also exhibits faster curing gelation times and the ability to be solution-cast onto a porous support for formation of thin-film composite membranes without significant selective layer soak-in.

Industrial & Engineering Chemistry Research published new progress about Gas separation membranes. 1592-20-7 belongs to class chlorides-buliding-blocks, and the molecular formula is C9H9Cl, Application of C9H9Cl.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Zhang, Wei; Zheng, Suqing; Liu, Na; Werness, Jenny B.; Guzei, Ilia A.; Tang, Weiping published the artcile< Enantioselective bromolactonization of conjugated (Z)-enynes>, Synthetic Route of 22717-55-1, the main research area is lactone derivative asym preparation; conjugated enyne preparation bromolactonization cinchona.

A catalytic enantioselective syn-1,4-bromolactonization of conjugated (Z)-enynes was reported. Diastereomeric ratios >20:1 and up to 99% enantiomeric excesses were observed Di-, tri-, and tetra-substituted bromoallenes were prepared together with lactone heterocycles efficiently and stereoselectively. Preliminary investigations suggest that the chiral catalyst may serve as a bifunctional reagent by interacting with both a carboxylic acid nucleophile and NBS electrophile.

Journal of the American Chemical Society published new progress about Alkenynes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 22717-55-1 belongs to class chlorides-buliding-blocks, and the molecular formula is C8H7ClO3, Synthetic Route of 22717-55-1.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Zablotowicz, Robert M.; Locke, Martin A.; Hoagland, Robert E. published the artcile< Aromatic nitroreduction of acifluorfen in soils, rhizospheres, and pure cultures of rhizobacteria>, Synthetic Route of 35852-58-5, the main research area is acifluorfen soil phytoremediation rhizobacteria.

Reduction of nitroarom. compounds to their corresponding amino derivatives is one of several pathways in the degradation of nitroxenobiotics. The nitrodiphenyl ether herbicide acifluorfen showed rapid metabolism to aminoacifluorfen followed by incorporation into unextractable soil components in both soil and rhizosphere suspensions. Aminoacifluorfen was formed more rapidly in rhizospheres compared to soil, which can be attributed to higher microbial populations, especially of Gram-neg. bacteria. Several strains of Pseudomonas fluorescens that possess nitroreductase activity capable of converting acifluorfen to aminoacifluorfen were identified. Factors affecting acifluorfen nitroreductase activity in pure cultures and cell-free extracts, and other catabolic transformations of acifluorfen, ether bond cleavage, are discussed. Plant rhizospheres should be conducive for aromatic nitroredn. Nitroredn. by rhizobacteria is an important catabolic pathway for the initial degradation of various nitroherbicides and other nitroarom. compounds in soils under phytoremediation management.

ACS Symposium Series published new progress about Pseudomonas fluorescens. 35852-58-5 belongs to class chlorides-buliding-blocks, and the molecular formula is C7H4ClF3O, Synthetic Route of 35852-58-5.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Kalaimani, S.; Ali, B. Mohamad; Nasar, A. Sultan published the artcile< Successful synthesis of blocked polyisocyanates, using easily cleavable phenols as blocking agents, and their deblocking and cure studies>, Related Products of 3964-57-6, the main research area is cure blocked polyisocyanate phenol blocking agent deblocking.

Phenols with electron withdrawing substituents at the 2,4-positions are important for use as blocking agents for isocyanates. Blocked polyisocyanates derived using such blocking agents are attractive for producing heat-cured polyurethane products at relatively low temperatures, i.e., below 160°C. In this study, a series of blocked polyisocyanates were prepared using phenol, 2,4-dichlorophenol, 2-chloro-4-esterphenol and 2-chloro-4-nitrophenol; their blocking and deblocking kinetics, deblocking temperatures, equilibrium temperatures, equilibrium rate constants and cure-times were studied using a hot-stage FT-IR spectrophotometer, adapting neat conditions. Double Arrhenius plots for these thermally reversible systems were reported with an aim to understanding the relationship between forward and reverse reactions. It was found that the rates of forward and reverse reactions and equilibrium rates increased with increasing the acidity of phenol, except in the case of 2-chloro-4-nitrophenol; correspondingly, the deblocking temperature and cure-time of blocked polyisocyanates decreased. Blocked polyisocyanates obtained using unsubstituted phenol showed equilibrium temperature as a range in the double Arrhenius plot, whereas, in the case of 2,4-dichlorophenol and 2-chloro-4-nitrophenol, the Arrhenius plots showed distinct equilibrium temperatures The equilibrium temperature range or equilibrium temperature of 2-chloro-4-esterphenol-blocked polyisocyanate was not determined, as extrapolation of its plot was found to extend out of the temperature range studied. Importantly, as expected with strong background, all three di-substituted phenols were found to deblock remarkably below 55-70°C, compared to unsubstituted phenol, which deblocks at 135°C. More importantly, 2-chloro-4-nitrophenol deblocks at 65°C and its blocked polyisocyanate cures with polyol within 25 min at 110°C.

RSC Advances published new progress about Absorption. 3964-57-6 belongs to class chlorides-buliding-blocks, and the molecular formula is C8H7ClO3, Related Products of 3964-57-6.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Shi, Jun-Bin; Bu, Qingqing; Liu, Bin-Yuan; Dai, Bin; Liu, Ning published the artcile< Organocatalytic Strategy for the Fixation of CO2 via Carboxylation of Terminal Alkynes>, Quality Control of 3240-10-6, the main research area is propiolic acid preparation; terminal alkyne carbon dioxide carboxylation organocatalyst.

An organocatalytic strategy for the direct carboxylation of terminal alkynes with CO2 had been developed. The combined use of a bifunctional organocatalyst and Cs2CO3 resulted in a robust catalytic system for the preparation of a range of propiolic acid derivatives RC≡CCOOH [R = t-Bu, Ph, 2-thienyl, etc.] in high yields with broad substrate scope using CO2 at atm. pressure under mild temperatures (60°C). This work had demonstrated that this organocatalytic method offered a competitive alternative to metal catalysis for the carboxylation of terminal alkynes and CO2. In addition, this protocol was suitable for the three-component carboxylation of terminal alkynes, alkyl halides and CO2.

Journal of Organic Chemistry published new progress about Alkynes, α- Role: RCT (Reactant), RACT (Reactant or Reagent). 3240-10-6 belongs to class chlorides-buliding-blocks, and the molecular formula is C9H5ClO2, Quality Control of 3240-10-6.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Vialaton, Delphine; Baglio, Daniela; Paya-Perez, Ana; Richard, Claire published the artcile< Photochemical transformation of acifluorfen under laboratory and natural conditions>, Name: 2-Chloro-4-(trifuloromethyl)phenol, the main research area is acifluorfen photolysis photoproduct decarboxylation.

Acifluorfen was irradiated in pure water at various excitation wavelengths and pH values. Numerous photoproducts were obtained which were identified by [1H]NMR and/or HPLC-MS/MS. The main reaction pathways were photo-decarboxylation, photo-cleavage of the ether bonding with formation of phenolic compounds, photo-dechlorination and photo-Claisen type rearrangement. Decarboxylation was observed in acidic and neutral media whereas cleavage of the ether bonding dominated in basic media. The photo-Claisen type rearrangement only occurred on excitation at short wavelengths. The quantum yield of photolysis was significantly lower at 313nm (6.1 × 10-5) than at 254nm (2.0 × 10-3). The photoreactivity of acifluorfen was then studied in conditions approaching environmental conditions. Acifluorfen was dissolved in pure water, in water containing humic substances or in a natural water, and exposed to solar light in June at Clermont-Ferrand (latitude 46°N). In pure water, the half-life was estimated at 10 days and photo-decarboxylation accounted for 30% of the conversion. The presence of humic substances (10 mg litre-1) did not affect the rate of photo-transformation. However, the half-life of acifluorfen dissolved in the natural water was only 6.8 days.

Pest Management Science published new progress about Decarboxylation (photo). 35852-58-5 belongs to class chlorides-buliding-blocks, and the molecular formula is C7H4ClF3O, Name: 2-Chloro-4-(trifuloromethyl)phenol.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Mo, Daize; Chen, Hui; Zhou, Jiadong; Han, Liang; Zhu, Yulin; Chao, Pengjie; Zheng, Nan; Xie, Zengqi; He, Feng published the artcile< Isomeric effects of chlorinated end groups on efficient solar conversion>, Recommanded Product: 5-Chloroisobenzofuran-1,3-dione, the main research area is isomeric chlorinated solar polythiophene electronic optoelectronic photovoltaic.

Isomers with subtle differences in their mol. structure often exhibit different electronic/optoelectronic properties, charge-transport behaviors and photovoltaic performances. In this work, we describe BTIC-2Cl-γ, BTIC-2Cl-δ, and BTIC-2Cl-β, three isomers with acceptor-donor-acceptor-donor-acceptor (A-D-A-D-A) structures, in which a fused benzothiadiazole is the donor (D) unit and a single chlorine atom substituted at the δ, β or γ position of the benzene-fused end groups is the acceptor (A) unit. In general, changes in the position of the chlorine atom were found to lead to significantly different absorptions, energy levels, and photovoltaic performances. Compared to BTIC-2Cl-δ, the BTIC-2Cl-γ isomer shows similar UV/Vis absorption, energy levels, and mol. packing, but slightly better photovoltaic performance. A crystallog. anal. of BTIC-2Cl-δ indicates that the mols. easily form a three-dimensional (3D) network due to the noncovalent interactions of Cl···S, Cl···π and Cl···N. When blended with PBDB-TF as an electron-donor material, the devices based on BTIC-2Cl-γ exhibited higher power conversion efficiency (PCE) of up to 15.04% with an increased voltage (Voc) of 0.90 V, which was better than that of BTIC-2Cl-δ-based devices (14.13%) and much higher than that of BTIC-2Cl-β-based devices (7.39%). Our studies demonstrate that having the chlorine atom at the different positions of the end groups clearly affects the photovoltaic properties of the resulting acceptors.

Journal of Materials Chemistry A: Materials for Energy and Sustainability published new progress about Aggregation. 118-45-6 belongs to class chlorides-buliding-blocks, and the molecular formula is C8H3ClO3, Recommanded Product: 5-Chloroisobenzofuran-1,3-dione.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Yang, Ke; Liu, Qiang; Wen, Shuai; Zhuang, Tao published the artcile< Synthesis of branched polyisobutylenes via cationic copolymerization of p-chloromethylstyrene and isobutylene>, COA of Formula: C9H9Cl, the main research area is branched chloromethylstyrene polyisobutylene cationic copolymerization polydispersity kinetics.

Branched polyisobutylenes (PIBs) with relatively low dispersities (1.4-1.8) and benzylic halide functionalities are synthesized by self-condensing vinyl cationic copolymerization of p-chloromethylstyrene (p-CMS) and isobutylene (IB) coinitiated by TiCl4. It is found that the [IB]/[p-CMS] feed ratio plays a crucial role for the initiating behavior of p-CMS: the initiation arising from p-CMS is suppressed at [IB]/[p-CMS] ≥17; in contrast, the pendant benzyl chloride moiety of p-CMS monomer in the formed copolymer chains can initiate branching reactions. The resulting branched PIBs are of a gradient composition as well as a gradual increase in branching d. due to large disparity in reactivity ratios. This strategy is successfully employed to create branched PIBs with low to moderate mol. weights (Mn, 5 k-78 k Da) through controlling the monomer/initiator mole ratio. However, it is shown that this method failed to obtain branched PIBs with high Mn, bearing a complicated copolymerization mechanism.

Journal of Polymer Science (Hoboken, NJ, United States) published new progress about Cationic polymerization. 1592-20-7 belongs to class chlorides-buliding-blocks, and the molecular formula is C9H9Cl, COA of Formula: C9H9Cl.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics

Li, Wenhui; Gao, Lihong; Shi, Yali; Wang, Yuan; Liu, Jiemin; Cai, Yaqi published the artcile< Spatial distribution, temporal variation and risks of parabens and their chlorinated derivatives in urban surface water in Beijing, China>, Reference of 3964-57-6, the main research area is spatial distribution temporal variation risk paraben chlorinated derivative; risk paraben chlorinated derivative river lake water Beijing China; Parabens; Risk assessment; Spatial distribution; Temporal variation; Urban surface water.

The occurrence and distribution of 13 target compounds, including 8 parabens, 4 chlorinated parabens and p-hydroxybenzoic acid (PHBA), were detected in surface water samples at 35 sampling sites in the Beijing River system, China. The surface water samples were collected from the main rivers and lakes in the urban area monthly from July 2013 to June 2014 (except the frozen period). Laboratory analyses revealed that parabens were ubiquitous in the surface water of Beijing. PHBA was the predominant compound in the surface water samples, with the average concentration of 239 ng/L, followed by the total amount of chlorinated parabens (average 50.1 ng/L) and parabens (average 44.3 ng/L). It is noteworthy that octylparaben with longer chain was 1st detected in the surface water. Significant difference was observed for paraben concentrations from different sampling sites, and the highest level of parabens was found in the Xiaotaihou River, which was mainly due to the untreated sewage discharge. Seasonal variation of target compounds in the urban surface water was also studied, and parabens exhibited a different temporal variation from chlorinated derivatives A combination of factors including high residual Cl level and water temperature as well as intense UV radiation might enhance the persistence of chlorinated parabens in chlorinated water during the wet season. Risk assessment showed that parabens and their chlorinated derivatives are not likely to produce biol. effects on aquatic ecosystems at current levels in the surface water of Beijing.

Science of the Total Environment published new progress about Algae. 3964-57-6 belongs to class chlorides-buliding-blocks, and the molecular formula is C8H7ClO3, Reference of 3964-57-6.

Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics