Tag: 200-300

Preparation of Bisphenol-A and Polydimethylsiloxane (PDMS) Block Copolycarbonates by Melt Polycondensation: Effects of PDMS Chain Length on Conversion and Miscibility was written by Zhou, Zibo;Wu, Guozhang. And the article was included in Polymers (Basel, Switzerland) in 2021.Related Products of 102-09-0 The following contents are mentioned in the article:

This study aimed to improve polydimethylsiloxane (PDMS) conversion in the preparation of polycarbonate (PC)-polydimethylsiloxane (PDMS) copolymer through melt polycondensation. We examined the transesterification process of PDMS with di-Ph carbonate (DPC) and its copolymerization products with bisphenol-A (BPA) for different chain lengths of PDMS. The key factors affecting PDMS conversion were investigated. Results showed that long-chain PDMS required a higher critical transesterification level (38.6%) to improve miscibility with DPC. During polycondensation, side reactions were more prone to occur when the equilibrium transesterification level of long-chain PDMS was lower. PDMS conversion was also lower when more short-chain PDMS was fed. Increasing the chain length of PDMS also reduced PDMS conversion. Notably, increasing the amount of KOH can significantly improve PDMS conversion throughout the polycondensation stage by increasing the equilibrium transesterification level of long-chain PDMS, thereby inhibiting the occurrence of side reactions. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Related Products of 102-09-0).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Related Products of 102-09-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Novel main-chain-fluorinated polymers for 157-nm photoresists was written by Toriumi, Minoru;Koh, Meiten;Ishikawa, Takuji;Kodani, T.;Araki, Takayuki;Aoyama, Hirokazu;Yamashita, Tsuneo;Yamazaki, Tamio;Furukawa, Takamitsu;Itani, Toshiro. And the article was included in Proceedings of SPIE-The International Society for Optical Engineering in 2003.Formula: C7H6F6O2 The following contents are mentioned in the article:

Main-chain-fluorinated base-resins, including tetrafluoroethylene and norbornene derivatives, were synthesized and their fundamental properties, such as transparency at 157 nm and solubility in a standard alk. developer, were characterized. A high transparency, i.e., absorbance of less then 0.5 μm^-1, was achieved by optimizing the polymerization conditions with a variety of counter monomers. It was found that the polymerization conditions could also control the dissolution rates of the fluoropolymers and increased the dissolution rate of unprotected fluoropolymers by about three orders of magnitude, which was sufficient for the alk. developability. Pos.-working resists based on fluororesins were developed and showed good transparency of less than 1 μm^-1 at 157 nm, and good solubility in a standard alk. solution of 0.26-N tetramethylammonium (without any swelling behavior). And an acceptable etching rate as resistant as ArF resists was obtained and 65-nm dense lines could be delineated by the exposure at 157-nm wavelength. This study involved multiple reactions and reactants, such as 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3Formula: C7H6F6O2).

1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Formula: C7H6F6O2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

New Radical Borylation Pathways for Organoboron Synthesis Enabled by Photoredox Catalysis was written by Qi, Jing;Zhang, Feng-Lian;Jin, Ji-Kang;Zhao, Qiang;Li, Bin;Liu, Lin-Xuan;Wang, Yi-Feng. And the article was included in Angewandte Chemie, International Edition in 2020.HPLC of Formula: 898787-14-9 The following contents are mentioned in the article:

Radical borylation using N-heterocyclic carbene (NHC)-BH₃ complexes as boryl radical precursors has emerged as an important synthetic tool for organoboron assembly. However, the majority of reported methods are limited to reaction modes involving carbo- and/or hydroboration of specific alkenes and alkynes. Moreover, the generation of NHC-boryl radicals relies principally on hydrogen atom abstraction with the aid of radical initiators. A distinct radical generation method is reported, as well as the reaction pathways of NHC-boryl radicals enabled by photoredox catalysis. NHC-boryl radicals are generated via a single-electron oxidation and subsequently undergo cross-coupling with the in-situ-generated radical anions to yield gem-difluoroallylboronates. A photoredox-catalyzed radical arylboration reaction of alkenes was achieved using cyanoarenes as arylating components from which elaborated organoborons were accessed. Mechanistic studies verified the oxidative formation of NHC-boryl radicals through a single-electron-transfer pathway. This study involved multiple reactions and reactants, such as Ethyl 4-(2,2,2-Trifluoroacetyl)benzoate (cas: 898787-14-9HPLC of Formula: 898787-14-9).

Ethyl 4-(2,2,2-Trifluoroacetyl)benzoate (cas: 898787-14-9) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.HPLC of Formula: 898787-14-9

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

One-step synthesis of environment-friendly cyclodextrin-based nanosponge and its applications for removal of dyestuff from aqueous solutions was written by Li, Liuxing;Liu, Huijun;Li, Wei;Liu, Kai;Tang, Ting;Liu, Juan;Jiang, Wenkang. And the article was included in Research on Chemical Intermediates in 2020.HPLC of Formula: 102-09-0 The following contents are mentioned in the article:

Cyclodextrin-based nanosponges (CDNS) are a novel kind of polymers belonged to cross-linked derivatives of cyclodextrins, and they are safe, biodegradable materials with appreciable toxicity to the environment. In this work, CDNS were fabricated in one-step solvothermal method by β-cyclodextrin (β-CD) and di-Ph carbonate (DPC), for the removal of dyestuffs from wastewater using two of the familiar dyes as the model contaminant. It was systematically investigated by the influence of the amount of adsorbent, the molar ratio of β-CD and DPC, pH, time, and initial concentration Exptl. results showed the maximum adsorption capacities of Basic red 46 and Rhodamine B were 101.43 mg/g and 52.33 mg/g, the adsorption behavior of two contaminants followed pseudo-second-order model and the Langmuir monolayer adsorption models. The differences in adsorption capacities on two model contaminants might due to the influence of dye structure. In conclusion, cyclodextrin-based nanosponges are a promising kind of environment-friendly materials in water treatment. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0HPLC of Formula: 102-09-0).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.HPLC of Formula: 102-09-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Selective Chemical Upcycling of Mixed Plastics Guided by a Thermally Stable Organocatalyst was written by Jehanno, Coralie;Demarteau, Jeremy;Mantione, Daniele;Arno, Maria C.;Ruiperez, Fernando;Hedrick, James L.;Dove, Andrew P.;Sardon, Haritz. And the article was included in Angewandte Chemie, International Edition in 2021.Related Products of 102-09-0 The following contents are mentioned in the article:

Chem. recycling of plastic waste represents a greener alternative to landfill and incineration, and potentially offers a solution to the environmental consequences of increased plastic waste. Most plastics that are widely used today are designed for durability, hence currently available depolymerization methods typically require harsh conditions and when applied to blended and mixed plastic feeds generate a mixture of products. Herein, we demonstrate that the energetic differences for the glycolysis of BPA-PC and PET in the presence of a protic ionic salt TBD:MSA catalyst enables the selective and sequential depolymerization of these two commonly employed polymers. Employing the same procedure, functionalized cyclic carbonates can be obtained from both mixed plastic wastes and industrial polymer blend. This methodol. demonstrates that the concept of catalytic depolymerization offers great potential for selective polymer recycling and also presents plastic waste as a “greener” alternative feedstock for the synthesis of high added value mols. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Related Products of 102-09-0).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Related Products of 102-09-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Mass spectra of dodecadienic compounds with a conjugated double bond, lepidopterous sex pheromones was written by Ando, Tetsu;Katagiri, Yoshio;Uchiyama, Masaaki. And the article was included in Agricultural and Biological Chemistry in 1985.Recommanded Product: (E)-Dodeca-9,11-dien-1-yl acetate The following contents are mentioned in the article:

All geometrical isomers of 5,7-, 6,8-, 7,9-, 8,10- and 9,11-dodecadien-1-ols, and their acetates and aldehyde derivatives were analyzed by electron impact mass spectrometry. The abundance of mol. ion (M⁺) was observed in every spectrum, and the relative intensity of M⁺ tended to be strong if the compound possessed an (E)-double bond(s). In addition to M⁺, [M – H₂O]⁺ (alcs.) and [M – CH₃CO₂H]⁺ (acetates), every dienic compound showed typical series of C_nH_2n-2⁺ âˆ?C_nH_2n-5⁺ with abundance maximum around C₄, C₅, C₆ or C₇. Each double bond positional isomer characteristically yielded different ion peaks in the series, which were useful for its distinction from other isomers. These results indicate that the chem. structure of a natural pheromone of Lepidoptera is easily deduced successfully by GC-MS anal. if it is a conjugated dienic pheromone. This study involved multiple reactions and reactants, such as (E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7Recommanded Product: (E)-Dodeca-9,11-dien-1-yl acetate).

(E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Recommanded Product: (E)-Dodeca-9,11-dien-1-yl acetate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Optimization of SFE-CO₂ of tea flowers (Camellia sinensis L.) and analysis of its extracts by GC-MS was written by Fu, Li-ya;Liu, Shu-juan;Ma, Meng-jun;Luo, Li-yong;Zeng, Liang. And the article was included in Xinan Daxue Xuebao, Ziran Kexueban in 2015.Product Details of 5444-75-7 The following contents are mentioned in the article:

Supercritical fluid extraction using carbon dioxide (SFE-CO₂) was employed to study the optimal process parameters of tea flower (Camellia sinensis L.) and aroma anal. was made of its extracts by GC-MS. Three parameters-pressure, temperature and CO₂ flow rate-were selected, and their influences on yield were investigated. Based on the results of an orthogonal experiment, the optimum process parameters were shown to be: extraction pressure 25 Mpa, extraction temperature 40°C and CO₂ flow rate 25 kg/h. Under such a condition, the actual yield of extracts was 1.36%±0.09%. The results of range anal. indicated that the order of the three parameters influencing the extraction yield was CO₂ flow rate>extraction pressure>extraction temperature The results of GC-MS anal. from MS with retention index (RI) showed that there were 97 aroma compounds in the extracts of tea flowers. They were alkanes (33.85%), esters (8.49%), aldehydes (2.35%), ketones (5.95%), alcs. (2.86%), acids (31.18%), terpenes (8.16%), the others (7.16%). This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Product Details of 5444-75-7).

2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Product Details of 5444-75-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Dynamic pyrolytic reaction mechanisms, pathways, and products of medical masks and infusion tubes was written by Xu, Weijie;Liu, Jingyong;Ding, Ziyi;Fu, Jiawei;Evrendilek, Fatih;Xie, Wuming;He, Yao. And the article was included in Science of the Total Environment in 2022.HPLC of Formula: 5444-75-7 The following contents are mentioned in the article:

Given the COVID-19 epidemic, the quantity of hazardous medical wastes has risen unprecedentedly. This study characterized and verified the pyrolysis mechanisms and volatiles products of medical mask belts (MB), mask faces (MF), and infusion tubes (IT) via thermogravimetric, IR spectroscopy, thermogravimetric-Fourier transform IR spectroscopy, and pyrolysis-gas chromatog./mass spectrometry analyses. Iso-conversional methods were employed to estimate activation energy, while the best-fit artificial neural network was adopted for the multi-objective optimization. MB and MF started their thermal weight losses at 375.8 °C and 414.7 °C, resp., while IT started to degrade at 227.3 °C. The average activation energies were estimated at 171.77, 232.79, 105.14, and 205.76 kJ/mol for MB, MF, and the first and second IT stages, resp. Nucleation growth for MF and MB and geometrical contraction for IT best described the pyrolysis behaviors. Their main gaseous products were classified, with a further proposal of their initial cracking mechanisms and secondary reaction pathways. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7HPLC of Formula: 5444-75-7).

2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.HPLC of Formula: 5444-75-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Stereoselective synthesis of (E)-, (E,Z)- and (E,E)-conjugated dienes via alkylation of 3-sulfolenes as key step was written by Yamada, Sachiko;Ohsawa, Hideto;Suzuki, Takayoshi;Takayama, Hiroaki. And the article was included in Chemistry Letters in 1983.Product Details of 50767-78-7 The following contents are mentioned in the article:

Alkylation of 3-sulfolene in the presence of (Me₃Si)₂NLi gave 40-65% I [R = Bu, Me, Et, heptyl, isoamyl, (CH₂)₃CO₂CMe₃, tetrahydropyranyloxyoctyl (R²), tetrahydropyranyloxyheptyl (R³), CH₂Ph, R¹ = H]. Alkylation of I (R = Bu, heptyl, R³, R¹ = H) gave 55-71% trans–I (R¹ = Bu, heptyl, Me) together with 1-9% of the corresponding cis–I. Thermolysis of trans–I in octane gave (E,Z)-R¹CH:CHCH:CHR, whereas in EtOH in the presence of base (E,E)-R¹CH:CHCH:CHR were obtained quant. Ether cleavage of I (R = R², R¹ = H; R = R³, R¹ = Me), followed by thermolysis, gave (E)-CH₂:CHCH:CH(CH₂)₈OAc and (E,E)-MeCH:CHCH:CH(CH₂)₇OH resp. This study involved multiple reactions and reactants, such as (E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7Product Details of 50767-78-7).

(E)-Dodeca-9,11-dien-1-yl acetate (cas: 50767-78-7) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Product Details of 50767-78-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Direct synthesis of a jet fuel range dicycloalkane by the aqueous phase hydrodeoxygenation of polycarbonate was written by Wang, Lulin;Li, Guangyi;Cong, Yu;Wang, Aiqin;Wang, Xiaodong;Zhang, Tao;Li, Ning. And the article was included in Green Chemistry in 2021.Application of 102-09-0 The following contents are mentioned in the article:

For the first time, propane-2,2-diyldicyclohexane, a jet fuel range C15 dicycloalkane was directly produced by the aqueous phase hydrodeoxygenation (APHDO) of polycarbonate (PC). Among the investigated catalyst systems, the mixture of Rh/C and H-USY (denoted as Rh/C + H-USY) exhibited the best performance. Over it, a high yield of propane-2,2-diyldicyclohexane (94.9%) was achieved from the APHDO of pure PC pellets after a reaction was carried out at 473 K and 3.5 MPa H2 for 12 h. The Rh/C + H-USY catalyst was stable under the investigated conditions. No evident deactivation was observed during three repeated cycles. When we used a chopped DVD disk (a representative of real PC wastes) as the substrate, a high yield (86.9%) of propane-2,2-diyldicyclohexane was obtained under the same reaction conditions. The propane-2,2-diyldicyclohexane as obtained had a high d. (0.92 g mL^-1) and a high volumetric net heat of combustion (39.6 MJ L^-1). As a potential application, it can be blended into jet fuels to improve the range and payload of airplanes. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Application of 102-09-0).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Application of 102-09-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics