Tag: 200-300

5,5′-(Ethyne-1,2-diyl)diisophthalic acid dimethyl sulfoxide tetrasolvate was written by Muench, Alexander S.;Katzsch, Felix;Weber, Edwin;Mertens, Florian O. R. L.. And the article was included in Acta Crystallographica, Section E: Structure Reports Online in 2013.Name: Dimethyl 5-ethynylisophthalate This article mentions the following:

In the title compound, C₁₈H₁₀O₈·4C₂H₆OS, the mid-point of the triple bond of the main mol. is located on a special position, i.e. about an inversion center. The carboxyl groups are twisted slightly out of the planes of the aromatic rings to which they are attached, making dihedral angles of 24.89(1) and 7.40(2)°. The crystal packing features strong O-H···O H bonds, weaker C-H···O interactions and O···S contacts [3.0981(11) Å] and displays channel-like voids extending along the a-axis direction which contain the DMSO solvent mols. Crystallog. data and at. coordinates are given. In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5Name: Dimethyl 5-ethynylisophthalate).

Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) 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. 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.Name: Dimethyl 5-ethynylisophthalate

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

Versatile ω-end group functionalization of RAFT polymers using functional methane thiosulfonates was written by Roth, Peter J.;Kessler, Daniel;Zentel, Rudolf;Theato, Patrick. And the article was included in Journal of Polymer Science, Part A: Polymer Chemistry in 2009.SDS of cas: 27249-90-7 This article mentions the following:

Five different polymers, poly[methyl methacrylate] (PMMA), poly[lauryl methacrylate] (PLMA), poly[diethylene glycol methacrylate] (PDEGMA), poly[N-isopropylacrylamide] (PNIPA), and poly[styrene] (PS) prepared by the RAFT process and thus terminated with dithioesters were aminolyzed in the presence of S-3-butynyl methane thiosulfonate (MTS), which was synthesized in two steps. Anal. of the polymers by 2D NMR, UV-vis absorbance, and gel permeation chromatog. revealed them to quant. carry acetylene end groups connected with disulfide bridges, indicating that functional MTS reagents can be employed for end group functionalization of RAFT polymers. This versatile method is of advantage compared with conjugations with functional maleimides, where isolation of terminal thiols is often required but inexpedient for poly[(meth)acrylates] because their terminal thiols may undergo backbiting and thus avoid conjugation. The acetylene-terminated polymers were bound to an azide functionalized glass surface in a Cu(I) catalyzed cycloaddition The modified surfaces exhibited water contact angles corresponding to the polarity of the attached polymers. In the case of the stimulus responsive polymers PNIPA and PDEGMA, the surfaces showed temperature-dependent contact angles. The disulfide bond connecting the polymers to the surface could be selectively cleaved and resulted in all surfaces having the same contact angle, independent of the nature of the polymer prior attached to the surface. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 3118-3130, 2009. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7SDS of cas: 27249-90-7).

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. 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.SDS of cas: 27249-90-7

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

PVC-membrane potentiometric sensors based on a recently synthesized Schiff base for Fe(III) ion was written by Sheikhshoaie, Iran;Shamspur, Tayebeh;Mostafavi, Ali;Ebrahimipur, S. Yousef. And the article was included in Bulletin of the Chemical Society of Ethiopia in 2012.Synthetic Route of C12H22O4 This article mentions the following:

A potentiometric iron sensor based on the use 3-(2-diethylamino-ethylimino)-1,3-dihydro-indol-2-one (DEDIO) as an ionophore in poly(vinyl chloride) (PVC) matrix, is reported. The plasticized membrane sensor exhibits a Nernstian response for Fe(III) ions over a wide concentration range (2.0 × 10^-6-5.0 × 10^-2 M) with a super Nernstian slope of 26 ±1 mV per decade. It has a fast response time of <12 s and can be used for ten weeks without any considerable divergences in its potentials. The electrode can be used in the pH range 4.5-8.0. The proposed sensor shows fairly good discriminating ability towards Fe(III) in comparison with a large number of alkali, alk. earth, transition, and heavy metal ions. The sensor was used as indicator electrode in potentiometric titration of Fe(III) vs. EDTA. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Synthetic Route of C12H22O4).

Dimethyl decanedioate (cas: 106-79-6) 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. 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.Synthetic Route of C12H22O4

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

Synthesis of 22-bromodocosanol was written by Signer, R.;Sprecher, P.. And the article was included in Helvetica Chimica Acta in 1947.Recommanded Product: 12-Methoxy-12-oxododecanoic acid This article mentions the following:

For the study of the question whether on bromination of a mol. layer of Me(CH₂)₂₀CH₂OH the Br enters the Me group or attacks the CH₂ groups, BrCH₂(CH₂)₂₀CH₂OH (I) is synthesized for comparison. MeO₂C(CH₂)₁₀CO₂Me (44.4 g.) in 235 cc. MeOH is saponified with the calculated amount of N Ba(OH)₂ in MeOH 2 days at room temperature with shaking, giving 49.6 g. Ba salt of the mono ester. This is converted with 17.5 g. Na₂SO₄ in 700 cc. H₂O into the Na salt which is decomposed by adjusting the solution to pH 4, giving 85% MeO₂C(CH₂)₁₀CO₂H (II), m. 52°. When 14.4 g. II in 52 cc. MeOH containing 1 g. KOH is electrolyzed 12 hrs. at 600° (30-5 v., about 0.3 amp.), using Pt electrodes, 43% MeO₂C(CH₂)₂₀CO₂Me (III), m. 69-70°, is obtained. Reduction of III by pouring 2 g. in 42 cc. absolute BuOH at 90° over 2.8 g. Na and heating the mixture with stirring at 150°, and saponification of the unchanged ester by boiling it 1 hr. with H₂O give 80% 1,22-docosanediol (IV), m. 102-2.5°. By determining the m.p. curve, it is found that on passing HBr into IV at 130° all the IV disappears after 12 min. and after 30 min. IV is almost completely converted into the 1,22-dibromide (V). For the preparation of I a rapid stream of HBr is passed into 2 g. IV at 110° for 1 min. After the excess HBr is expelled with dry air, the product is dissolved in 100 cc. PhMe and cooled to 0°, causing the quant. crystallization of the unchanged IV (1.4 g.). The filtrate is evaporated to dryness, the residue chromatographed from its C₆H₆ solution over Al₂O₃, giving pure I, m. 72°. The data of the x-ray diagrams of I and V are given in a table. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Recommanded Product: 12-Methoxy-12-oxododecanoic acid).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Recommanded Product: 12-Methoxy-12-oxododecanoic acid

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

Preparation of doubly responsive polymer functionalized silica hybrid nanoparticles via a one-pot thiol-isocyanate click reaction at room temperature was written by Ou, Baoli;Huang, Rao;Zhou, Hu;Li, Zhengfeng;Chen, Lijuan;Zhou, Zhihua;Li, Duxin. And the article was included in Polymer Composites in 2017.Safety of Benzyl benzodithioate This article mentions the following:

Well-defined poly(N-isopropylacrylamide) and poly(2-(diethylamino) Et methacrylate) were synthesized first by a reversible addition-fragmentation chain transfer process. These polymers were then reduced to generate an end thiol group to react with isocyanate groups on the surface of silica nanoparticles, which were pretreated with toluene-2,4-diisocyanate, by a one-pot “click” reaction to prepare temperature and pH responsive polymer functionalized hybrid silica nanoparticles. The polymer functionalized silica hybrid nanoparticles were characterized by a range of techniques such as Fourier transform IR spectroscopy and dynamic light scattering. The doubly responsive polymer functionalized silica hybrid nanoparticles show both temperature and pH responsive behavior and their solution properties were dependent on the ratio of the two polymers on the surface of silica. Covalent functionalization of the silica nanoparticle with well-defined temperature and pH responsive polymers was accomplished via a one-pot thiol-isocyanate click reaction. This reaction was found to be extremely efficient in producing doubly responsive polymer functionalized silica hybrid nanoparticle, even at relatively low reaction temperature and short reaction time. Thermogravimetric anal. indicated that the same ratio of poly(N-isopropylacrylamide) and poly(2-(diethylamino)ethyl methacrylate) functionalized silica hybrid nanoparticle consisted of 42.46 wt% polymer. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Safety of Benzyl benzodithioate).

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. 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. Safety of Benzyl benzodithioate

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

Non-targeted identification of unknown chemical hazardous substances in infant teether toys by gas chromatography-Orbitrap high resolution mass spectrometry was written by Liu, Yahui;Tong, Lili;Si, Nianpeng;Xing, Jiangtao;Zhang, Qing;Ma, Qiang;Lv, Qing. And the article was included in Ecotoxicology and Environmental Safety in 2021.Reference of 106-79-6 This article mentions the following:

Chem. hazardous substances in teethers may migrate into infant’s body through oral exposure, resulting in a potential health risk. In recent years, researchers have performed a series of studies for detecting target chems. in teethers and other toys, but the presence of unknown chems. has not been systematically investigated yet. This paper reports the non-targeted identification of unknown chem. hazards that may have migrated from teethers to infants based on gas chromatog.-Orbitrap high resolution mass spectrometry. In view of the difficulties that may be encountered in the qual. anal. of substances, several typical cases and the corresponding reliable solutions are given from the perspective of comprehensive score and retention index, isotope-aided qual. anal., chem. ionization identification formula, and fragment ion detail comparison for distinguishing isomers. Finally, 28 substances are identified in 10 teether samples. Among them, phenol, N-methylaniline, 1,6-dioxacyclododecane-7,12-dione and cyclohexanone have higher detection rates. This study not only has valuable reference for the identification of unknown substances, but also has pos. guiding role in monitoring potential chem. hazards in toys and promoting the safety of products. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Reference 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. 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.Reference of 106-79-6

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

Thermal dissolution of Shengli and Xiaolongtan lignites in methanol and analysis of the soluble portions was written by Yan, Jie;Zhao, Yun-peng;Xiao, Jian;Tian, You-jia. And the article was included in Ranliao Huaxue Xuebao in 2016.Quality Control of Dimethyl decanedioate This article mentions the following:

Thermal dissolution behaviors of Shengli (SL) and Xiaolongtan (XLT) lignite in methanol were investigated. The composition and structural characteristics of soluble portions (SPs) obtained at 320degree were characterized with Fourier transform IR spectroscopy, gas chromatograph/mass spectrometer (GC/MS) and atm. solid anal. probe/time of flight mass spectrometer (ASAP/TOF-MS). For the two lignites, the yield of SPs increase with temperature increasing, while the yield of SPs from XLT (SP_XLT) is obvious higher than that from SL (SP_SL) above 240 degree. GC/MS anal. results show that compounds in the SPs are dominated in oxygen-containing organic species, especially the relative content of phenols is higher than 49%. The relative contents of alkenes, arenes, ethers, carboxylic acids, esters, organosulfur compounds (OSCs) in SP_SL are higher, while the relative contents of alkanes, phenols, ketones and organonitrogen compounds in SP_SL are lower than those in SP_XLT. Addnl., the OSCs in SP_SL and SP_XLT are mainly composed of thiophenes and mercaptan, resp. Many compounds with high polarity and low volatility which could not be identified by GC/MS were identified using ASAP/TOF-MS. The relative contents of CHO and CHS class species in SP_SL are higher, but the relative contents of CHN, CHNO, CHOS, CHNS and CHNOS in SP_SL are lower than those in SP_XLT. The carbon number and double bond equivalent (DBE) of the compounds in SP_SL and SP_XLT mainly distribute in 0-10 and 3-15, resp., while the distribution of carbon number and DBE of the compound in SP_XLT are more concentrated than those in SP_SL. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Quality Control of Dimethyl decanedioate).

Dimethyl decanedioate (cas: 106-79-6) 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. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Quality Control of Dimethyl decanedioate

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

Studies on complex lipids. Synthesis of ionophoric derivatives of diphosphatidylglycerol (cardiolipin) was written by Kuz’mina, Yu. V.;Kaplun, A. P.;Shvets, V. I.;Saenko, V. A.;Egorova, E. M.. And the article was included in Bioorganicheskaya Khimiya in 1988.Formula: C13H24O4 This article mentions the following:

Synthesis of cardiolipin analogs containing a dibenzo-18-crown-6 ionophore residue in the fatty acid moiety, e.g. I (R = fatty acid residue), is described. The ionophore is incorporated into the second position of the glycerol residue by acylating mono- and dilysocardiolipin with a modified fatty acid anhydride. Lyso derivatives of cardiolipin have been prepared by enzymic hydrolysis of beef heart cardiolipin by snake venom phospholipase A₂. 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. 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. 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

Tailoring the pore geometry and chemistry in microporous metal-organic frameworks for high methane storage working capacity was written by Shao, Kai;Pei, Jiyan;Wang, Jia-Xin;Yang, Yu;Cui, Yuanjing;Zhou, Wei;Yildirim, Taner;Li, Bin;Chen, Banglin;Qian, Guodong. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2019.Application In Synthesis of Dimethyl 5-ethynylisophthalate This article mentions the following:

We realized that tailoring the pore size/geometry and chem., by virtue of alkynyl or naphthalene replacing Ph within a series of isomorphic MOFs, can optimize methane storage working capacities, affording an exceptionally high working capacity of 203 cm³ (STP)/cm³ at 298 K and 5-80 bar. In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5Application In Synthesis of Dimethyl 5-ethynylisophthalate).

Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) 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. 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.Application In Synthesis of Dimethyl 5-ethynylisophthalate

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