Tag: 200-300

Vapor Pressures and Enthalpies of Vaporization of a Series of the Symmetric Linear n-Alkyl Esters of Dicarboxylic Acids was written by Lipp, Svetlana V.;Krasnykh, Eugenii L.;Verevkin, Sergey P.. And the article was included in Journal of Chemical & Engineering Data in 2011.Electric Literature of C11H20O4 This article mentions the following:

Vapor pressures and the molar enthalpies of vaporization of the linear aliphatic alkyl esters of dicarboxylic acids R-CO₂-(CH₂)_n-CO₂-R with n = (0 to 4) with R = C₂H₅, n-C₃H₇, and n-C₄H₉ were determined using the transpiration method. A linear correlation of enthalpies of vaporization (at T = 298.15 K) of the esters with the number n and with Kovat’s indexes was found, proving the internal consistency of measured data. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Electric Literature of C11H20O4).

malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. 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.Electric Literature of C11H20O4

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

Experimental determination and theoretical correlation for the solubilities of dicarboxylic acid esters in supercritical carbon dioxide was written by Narayan, Ram C.;Dev, Jacob Varun;Madras, Giridhar. And the article was included in Journal of Supercritical Fluids in 2015.Application of 106-79-6 This article mentions the following:

The synthesis of high mol. weight esters such as bis (2-ethylhexyl) sebacate is of significance for its use as a lubricant. This ester is synthesized by the transesterification of di-Me sebacate with 2-ethylhexanol. Therefore, the solubilities of bis (2-ethylhexyl) sebacate and di-Me sebacate were determined at 308-328 K at pressures of 10-18 MPa in supercritical carbon dioxide. The solubility of di-Me sebacate was always higher than bis (2-ethylhexyl) sebacate at a given temperature and pressure. The Mendez-Teja model was used to verify the self-consistency of data. Further, a new semi-empirical model with three parameters was developed using the solution theory coupled with Wilson activity coefficient This model was used to correlate the exptl. data of this work and solubilities of many high mol. weight esters reported in the literature. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Application of 106-79-6).

Dimethyl decanedioate (cas: 106-79-6) 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. 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.Application of 106-79-6

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

Oligoamides from dodecanedioic acid and 4,4′-methylenedicyclohexylamine. (Oligoamides of the “Qiana” type) was written by Hahn, Guenther Erhard;Kusch, Peter;Rossbach, Volker;Zahn, Helmut. And the article was included in Makromolekulare Chemie in 1985.Formula: C13H24O4 This article mentions the following:

Pure isomers of cyclic monomeric amides were synthesized by cyclocondensation of 1,10-dodecanedioyl dichloride  [4834-98-4] and trans,trans– [6693-29-4], cis,trans– [6693-30-7], and cis,cis-4,4‘-methylenedicyclohexylamine  [6693-31-8] and were characterized by ¹H NMR, IR and mass spectroscopy, as well as by HPLC and x-ray diffraction. The content of these cyclic amides in Qiana nylon fibers was determined by fractionated extraction and sublimation. Synthesis and properties of monomeric linear condensation products containing dodecanedioyl and methylenedicyclohexylamine units (dicarboxylic acid-type with blocked and free end groups) were also described. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Formula: C13H24O4).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. 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. Formula: C13H24O4

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

Strategy for Good Dispersion of Well-Defined Tetrapods in Semiconducting Polymer Matrices was written by Lim, Jaehoon;Borg, Lisa zur;Dolezel, Stefan;Schmid, Friederike;Char, Kookheon;Zentel, Rudolf. And the article was included in Macromolecular Rapid Communications in 2014.Computed Properties of C14H12S2 This article mentions the following:

The morphol. or dispersion control in inorganic/organic hybrid systems is studied, which consist of monodisperse CdSe tetrapods (TPs) with grafted semiconducting block copolymers with excess polymers of the same type. Tetrapod arm-length and amount of polymer loading are varied in order to find the ideal morphol. for hybrid solar cells. Addnl., polymers without anchor groups are mixed with the TPs to study the effect of such anchor groups on the hybrid morphol. A numerical model is developed and Monte Carlo simulations to study the basis of compatibility or dispersibility of TPs in polymer matrixes are performed. The simulations show that bare TPs tend to form clusters in the matrix of excess polymers. The clustering is significantly reduced after grafting polymer chains to the TPs, which is confirmed exptl. Transmission electron microscopy reveals that the block copolymer-TP mixtures (“hybrids”) show much better film qualities and TP distributions within the films when compared with the homopolymer-TP mixtures (“blends”), representing massive aggregations and cracks in the films. This grafting-to approach for the modification of TPs significantly improves the dispersion of the TPs in matrixes of “excess” polymers up to the arm length of 100 nm. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Computed Properties of C14H12S2).

Benzyl benzodithioate (cas: 27249-90-7) 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. 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.Computed Properties of C14H12S2

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

The evaluation of solid phase micro-extraction fibre types for the analysis of organic components in unburned propellant powders was written by Dalby, Oliver;Birkett, Jason W.. And the article was included in Journal of Chromatography A in 2010.COA of Formula: C12H22O4 This article mentions the following:

This work describes the evaluation of various solid phase micro-extraction (SPME) fiber types for the detection of compounds originating from particles of unburned propellant powders. These compounds may also be found in association with organic gunshot residues (OGSR). Seven SPME fibers were assessed based on their ability to extract the compounds of interest (diphenylamine (DPA), 4-nitrodiphenylamine (4-NDPA), Et centralite (EC), nitroglycerin (NG) and di-Bu phthalate (DBP)) from four ammunition types across three calibres (9 mm, 5.56 mm and 7.62 mm). Extracts were analyzed by gas chromatog./mass spectrometry (GC/MS). The 65 μm polydimethylsiloxane/divinylbenzene (PDMS/DVB) was the most suitable fiber type for the extraction of these compounds across the ammunition types tested. Optimal extraction time parameters were also assessed with a 35-min period determined to be suitable. A number of previously unreported considerations for extracting propellant powders and potentially OGSR related materials are discussed. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6COA of Formula: C12H22O4).

Dimethyl decanedioate (cas: 106-79-6) 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. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.COA of Formula: C12H22O4

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

Synthesis of pH-Responsive Multilayer Micelles for Sustained Release of Folic Acid was written by Zhai, Cuiping;Wang, Pan;Liu, Xuejun. And the article was included in Polymer-Plastics Technology and Engineering in 2016.Electric Literature of C14H12S2 This article mentions the following:

Two novel triblock copolymers poly(hydroxypropyl acrylate)-b-poly (Me methacrylate)-b-poly(N,N-dimethylaminoethyl methacrylate) and poly(hydroxypropyl acrylate)-b-poly(Me methacrylate)-b-poly(acrylic acid) were successfully synthesized. In acetone media, using the electrostatic interactions between N,N-dimethylaminoethyl methacrylate and acrylic acid units, they could form spherically shaped multilayer micelles with pH-responsive, and have a mean diameter around 110 nm. The critical micelle concentration of it was determined to be 2.42 mg/L. In vitro release experiments, the folic acid-loaded micelles exhibited sustained release behavior and the drug release rate was affected by the pH value of release media. These results indicate that the multilayer micelles may serve as a novel intelligent drug delivery system. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Electric Literature of C14H12S2).

Benzyl benzodithioate (cas: 27249-90-7) 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. 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.Electric Literature of C14H12S2

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

A novel PVC-membrane optical sensor for highly sensitive and selective determination of UO₂²⁺ ion based on a recently synthesized benzo-substituted macrocyclic diamide and dibenzoylmethane was written by Shamsipur, Mojtaba;Zargoosh, Kiomars;Mizani, Farhang;Eshghi, Hossein;Rostami, Faramarz. And the article was included in Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy in 2010.Category: esters-buliding-blocks This article mentions the following:

A highly sensitive ion-selective bulk optode membrane for sensing UO₂²⁺ ion based on plasticized poly(vinyl chloride) containing 6,7,9,10,12,13,15,16,23,24,25,26-dodecahydrodibenzo[n,v][1,4,7,10,13,17,20]pentaoxa-diazacyclotricosine-22,27-dione as ionophore, dibenzodylmethane as chromoionophore and sodium tetraphenylborate as an ionic additive was prepared In addition to its high stability, reproducibility and relatively long lifetime, the proposed optical sensor revealed good selectivity for uranyl ion over a large number of alkali, alk. earth, transition, and heavy metal ions. The proposed sensor displays a calibration response for UO₂²⁺ over a concentration range of 4.3 × 10^-6 to 2.5 × 10^-8 M with a limit of detection of 8.0 × 10^-9 M and a response time of <12 min. The proposed optical sensor was applied successfully to the determination of UO₂ ²⁺ ion in tap water and Khoshumi mine concentrated solution samples. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Category: esters-buliding-blocks).

Dimethyl decanedioate (cas: 106-79-6) 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. 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.Category: esters-buliding-blocks

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

Rate autoacceleration and gelation behavior in radical copolymerization of methacrylate and dimethacrylate was written by Zhu, Mengbing;Xu, Sijia;Zhang, Hongwen;Ding, Yonghong;Yu, Qiang. And the article was included in Huagong Xuebao (Chinese Edition) in 2009.Computed Properties of C14H12S2 This article mentions the following:

Atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer (RAFT) and conventional free radical polymerization (FRP) of polyethylene glycol Me ether methacrylate (PEGMEMA) and polyethylene glycol dimethacrylates (PEGDMA) were conducted resp., and their reaction kinetics and gelation behavior were investigated with respect to the polymerization rate, vinyl conversion, gel point, and evolution of network. All the three systems experienced autoacceleration of the reaction. The rate autoacceleration in the ATRP was caused by diffusion-controlled radical deactivation, while that in the RAFT was attributed to diffusion-controlled addition of propagating radicals to RAFT-capped chains. In the ATRP and RAFT systems, the slow growth of primary chains allowed adequate chain relaxation and diffusion of reacting species, which reduced the probability of intramol. cyclizations and limited the formation of microgels, leading to earlier gelation, as compared with the FRP system. The crosslinking networks in the ATRP and RAFT developed mainly through gel radical propagation with monomers, along with incorporation of branched polymers, resulting in a gradual increase in gel fraction and network d. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Computed Properties of C14H12S2).

Benzyl benzodithioate (cas: 27249-90-7) 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. 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.Computed Properties of C14H12S2

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

Asymmetric synthesis of α-amino acids through α-iodination of chiral unsaturated carboxamides and stereoselective iodolactonization was written by Kitagawa, Osamu;Hanano, Tokushi;Kikuchi, Norihiko;Taguchi, Takeo. And the article was included in Tetrahedron Letters in 1993.Computed Properties of C12H23NO4 This article mentions the following:

The α-iodination reaction of chiral enamides I (R = H, R¹ = H, Me;,R = Me, R¹ = H) possessing (2R,5R)-2,5-bis(methoxymethyl)pyrrolidine as a chiral auxiliary proceeded with high diastereoselectivity in the presence of I₂ and s-collidine to give chiral iodides II. II were converted into amino acid derivatives III (Boc = tert-butoxycarbonyl) without epimerization. The subsequent iodolactonization of III afforded trans-lactones with a relatively high selectivity, e.g. III (R = R¹ = H, n = 2) was converted into lactone IV. IV was converted into unsaturated amino acid derivative V. In the experiment, the researchers used many compounds, for example, Boc-D-Leu-OMe (cas: 133467-01-3Computed Properties of C12H23NO4).

Boc-D-Leu-OMe (cas: 133467-01-3) 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. 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. Computed Properties of C12H23NO4

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

Donor-acceptor 2D covalent organic frameworks for efficient heterogeneous photocatalytic α-oxyamination was written by Liu, Huan;Yan, Xiaoli;Chen, Weiben;Xie, Zhen;Li, Shen;Chen, Weihua;Zhang, Ting;Xing, Guolong;Chen, Long. And the article was included in Science China: Chemistry in 2021.Synthetic Route of C12H14O3 This article mentions the following:

Covalent organic frameworks (COFs) have received widespread interest due to their high porosity, excellent crystallinity, tailorable structures, and broad application prospects. It has been demonstrated that proper combination and arrangement of electron donor and acceptor units in 2D conjugated COF lattice could promote efficient charge separation and electron transfer, and thus is beneficial for photocatalysis. In this article, three donor-acceptor (D-A) 2D COFs were prepared by Schiff base reaction of electron acceptor 4,4â€?4′â€?4′′â€?(benzo[1,2-d:4,5-d′]bis(oxazole)-2,4,6,8-tetrayl)tetraaniline (BBO) with different electron donors: thieno[3,2-b]thiophene-2,5-dicarbaldehyde (TT), benzo[1,2-b:4,5-b′]dithiophene-2,6-dicarboxaldehyde (BDT) and terephthalaldehyde (Ph), resp. These D-A 2D COFs exhibited prominent photocatalytic activity towards α-oxyamination of 1,3-dicarbonyl with 2,2,6,6-tetramethyl-1-piperdinyloxy (TEMPO) upon visible light irradiation Among these D-A_BBO-COFs, D_TT-A_BBO-COF exhibited the highest photocatalytic rates, which can be ascribed to the more neg. HOMO (HOMO) and narrower bandgap. The excellent stability, high activity and superior recyclability render D_TT-A_BBO-COF as a potential and environmentally friendly heterogeneous catalyst for α-oxyamination. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Synthetic Route of C12H14O3).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) 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. 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.Synthetic Route of C12H14O3

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