Tag: M.W=150-200

Hirano, Tomohiro published the artcileSyndiotactic- and heterotactic-specific radical polymerizations of N-n-propyl-α-fluoroacrylamide and phase-transition behaviors of aqueous solutions of poly(N-n-propyl-α-fluoroacrylamide), Formula: C9H22OSi, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2012), 50(12), 2471-2483, database is CAplus.

Radical polymerization of N-n-propyl-α-fluoroacrylamide (NNPFAAm) was studied in several solvents at low temperatures in the presence or absence of Lewis bases, Lewis acids, alkyl alcs., silyl alcs., or fluorinated alcs. Different effects of solvents and additives on stereospecificity were observed in the radical polymerizations of NNPFAAm and its hydrocarbon analogs such as N-isopropylacrylamide (NIPAAm) and N-n-propylacrylamide (NNPAAm); for instance, syndiotactic (and heterotactic) specificities were induced in radical polymerization of NNPFAAm in polar solvents (and in toluene in the presence of alkyl and silyl alcs.), whereas isotactic (and syndiotactic) specificities were induced in radical polymerizations of the hydrocarbon analogs under the corresponding conditions. In contrast, heterotactic specificity induced by fluorinated alcs. was further enhanced in radical polymerization of NNPFAAm. The effects of stereoregularity on the phase-transition behaviors of aqueous solutions of poly(NNPFAAm) were also studied. Different tendencies in stereoregularity were observed in aqueous solutions of poly(NNPFAAm)s from those in solutions of the hydrocarbon analogs such as poly(NIPAAm) and poly (NNPAAm). The polymerization behavior of NNPFAAm and the phase-transition behavior of aqueous poly(NNPFAAm) are discussed based on possible fluorine-fluorine repulsion between the monomer and propagating chain-end, and neighboring monomeric units. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 17877-23-5. 17877-23-5 belongs to alcohols-buliding-blocks, auxiliary class Protection and Derivatization Reagent, name is Triisopropylsilanol, and the molecular formula is C9H22OSi, Formula: C9H22OSi.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Kiskan, Baris published the artcileSynthesis and characterization of pyrrole and thiophene functional polystyrenes via “click chemistry”, Safety of 4-(1H-Pyrrol-1-yl)phenol, the publication is Polymer Bulletin (Heidelberg, Germany) (2011), 67(4), 609-621, database is CAplus.

Novel side-chain pyrrole or thiophene functional polystyrenes (PS-Py and PS-Th) were synthesized by using “click chem.” strategy. First, approx. 40% of chloro groups of poly(styrene-co-chloromethylstyrene) P(S-co-CMS), prepared by nitroxide mediated radical polymerization (NMRP), were converted to azido groups by using NaN₃ in N,N-dimethylformamide. Propargyl pyrrole was prepared by etherification of 4-(1H-pyrrol-1-yl)phenol prepared by Clauson-Kaas reaction using propargylbromide. Propargyl thiophene was synthesized by heterogeneous esterification reaction between 3-thiophenecarboxylic acid and propargylbromide. Finally, azido-functionalized polystyrene was coupled to these propargyl functional heterocyclics with high efficiency by click chem. The intermediates at various stages and final polymers were characterized by spectral anal. and cyclic voltammetry.

Polymer Bulletin (Heidelberg, Germany) published new progress about 23351-09-9. 23351-09-9 belongs to alcohols-buliding-blocks, auxiliary class Pyrrole,Benzene,Alcohol, name is 4-(1H-Pyrrol-1-yl)phenol, and the molecular formula is C10H9NO, Safety of 4-(1H-Pyrrol-1-yl)phenol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Dorival-Garcia, Noemi published the artcileIdentification of additives in polymers from single-use bioprocessing bags by accelerated solvent extraction and ultra-high performance liquid chromatography coupled with high-resolution mass spectrometry, Computed Properties of 122-20-3, the publication is Talanta (2020), 121198, database is CAplus and MEDLINE.

Single-use technologies are increasingly used in biopharmaceutical manufacturing Despite their advantages, these plastic assemblies draw concern because they are a potential source of contamination due to extractable and leachable compounds (E&Ls). Characterizing E&Ls from such materials is a necessary step in establishing their suitability for use. Therefore, there is an urgent need for sensitive methods to identify and quant. assess compounds in plastic materials. Accelerated solvent extraction (ASE) is a powerful technique that can be reliably used for this purpose. In this study, ASE followed by liquid chromatog. and Orbitrap-based High Resolution Accurate Mass (HRAM) mass anal. was found to be an efficient and versatile method for the determination of additives in different multilayer polymer systems from single-use bags. ASE optimization was performed using a design of experiments approach. The type of solvent, temperature, swelling agent addition, static time and number of cycles were the selected variables. Optimum conditions were dependent on the type of plastic film. Et acetate and cyclohexane were selected individually as optimum solvents. Optimum temperatures were 90-100°C. Pressure was set at 1500 psi and extraction time was 30 min in 2 cycles. Swelling agent addition was necessary with polar extraction solvents. More than 100 additives and degradation products were confidently identified by HRAM MS. Correlations between the type and levels of identified additives and the type of polymer system were established. In addition, degradation behavior and pathways for some additives can be addressed.

Talanta published new progress about 122-20-3. 122-20-3 belongs to alcohols-buliding-blocks, auxiliary class Organic Pigment, name is Triisopropanolamine, and the molecular formula is C9H21NO3, Computed Properties of 122-20-3.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Jirasek, Fabian published the artcileSolid-Liquid Equilibrium in the System 2-Keto-L-Gulonic Acid + L-Ascorbic Acid + Water, SDS of cas: 526-98-7, the publication is Chemical Engineering & Technology (2018), 41(12), 2306-2311, database is CAplus and MEDLINE.

The solid-liquid equilibrium (SLE) in the ternary system 2-keto-L-gulonic acid (HKGA) + L-ascorbic acid (vitamin C) + water was investigated exptl. at temperatures between 276 K and 308 K at ambient pressure, i.e., under conditions that are of particular interest for industrial applications. Phase diagrams with one eutonic point were obtained for all temperatures The dissociation constant and the solubility constant of vitamin C were determined as a function of temperature Based on an extended version of the Debye-Hueckel theory, a physicochem. model was developed that describes the SLE in the ternary system. The agreement between exptl. data and results from the model is excellent.

Chemical Engineering & Technology published new progress about 526-98-7. 526-98-7 belongs to alcohols-buliding-blocks, auxiliary class Sugar Units,Other Sugar Units, name is (3S,4R,5S)-3,4,5,6-Tetrahydroxy-2-oxohexanoic acid, and the molecular formula is C6H10O7, SDS of cas: 526-98-7.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Derz, Wiebke published the artcileGuiding Molecularly Imprinted Polymer Design by Pharmacophore Modeling, Quality Control of 86-48-6, the publication is Molecules (2021), 26(16), 5101, database is CAplus and MEDLINE.

Molecularly imprinted polymers (MIP) combine the selectivity of immunoaffinity chromatog. with the robustness of common solid-phase extraction in what is referred to as molecularly imprinted solid-phase extraction (MISPE). This contribution shows how MIP design may be guided by pharmacophore modeling for the example of citrinin, which is an emerging mycotoxin from cereals. The obtained pharmacophore model allowed searching public databases for a set of citrinin-mimicking mol. surrogates. Imprinted and non-imprinted polymers were subsequently obtained through bulk and core-shell polymerization in the presence of these surrogates. Evaluation of their binding ability for citrinin and structurally related ochratoxin A revealed a promising MIP derived from rhodizonic acid. A protocol for MISPE of citrinin from cereals was subsequently developed and compared to immunoaffinity chromatog. with respect to clean-up efficiency and recovery.

Molecules published new progress about 86-48-6. 86-48-6 belongs to alcohols-buliding-blocks, auxiliary class Organic Pigment,Natural product, name is 1-Hydroxy-2-naphthoic acid, and the molecular formula is C11H8O3, Quality Control of 86-48-6.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Shiley, R. H. published the artcileFungicidal activity of some fluoroaromatic compounds, Quality Control of 55346-97-9, the publication is Journal of Fluorine Chemistry (1975), 5(4), 371-6, database is CAplus.

Of 52 fluoroaromatic compounds tested (18 prepared) for their fungicidal activity against Stromatinia gladioli, Fusarium oxysporum gladioli, Curvularia trifolii gladioli, Thielaviopsis basicola, and Ceratocystis ulmi, I [327-91-3], II [38636-12-3], and III [327-92-4] were the most effective.

Journal of Fluorine Chemistry published new progress about 55346-97-9. 55346-97-9 belongs to alcohols-buliding-blocks, auxiliary class Fluoride,Nitro Compound,Benzene,Phenol, name is 4,5-Difluoro-2-nitrophenol, and the molecular formula is C3H5BN2O2, Quality Control of 55346-97-9.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Hreczycho, Grzegorz published the artcileA new catalytic approach to germasiloxanes, Product Details of C9H22OSi, the publication is Tetrahedron Letters (2011), 52(1), 74-76, database is CAplus.

A new ruthenium(0) complex catalyzed coupling reaction of silanols with vinylgermanes leading to SiO-Ge bond formation with the evolution of ethylene is described. Under optimum conditions the catalytic O-germylation of silanols gives exclusively germasiloxanes.

Tetrahedron Letters published new progress about 17877-23-5. 17877-23-5 belongs to alcohols-buliding-blocks, auxiliary class Protection and Derivatization Reagent, name is Triisopropylsilanol, and the molecular formula is C9H22OSi, Product Details of C9H22OSi.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Hammerl, Richard published the artcileQuantitative Proton NMR Spectroscopy for Basic Taste Recombinant Reconstitution Using the Taste Recombinant Database, Recommanded Product: 2-Hydroxy-2-phenylacetic acid, the publication is Journal of Agricultural and Food Chemistry (2021), 69(48), 14713-14721, database is CAplus and MEDLINE.

The quant. determination of putative taste active metabolites, the ranking of these compounds in their sensory impact based on dose-overthreshold (DoT) factors, followed by confirmation of their relevance by reconstitution and omission experiments enables the decoding of the non-volatile sensometabolome of certain foods. The identification and quantitation of target taste compounds by liquid chromatog.-tandem mass spectrometry (LC-MS/MS), high-performance liquid chromatog.-UV/visible (HPLC-UV/Vis) spectroscopy, or high-performance ion chromatog. (HPIC) is often laborious and time-consuming. In this work, we present a novel quant. ¹H NMR approach for reconstituting basic taste recombinants of different foods, including apple juice, balsamic vinegar, golden chanterelles, process flavor, and shrimp. Compound identification using the taste recombinant database, followed by absolute quantitation via quant. ¹H NMR (qHNMR), enables a fast and direct reconstitution of basic taste recombinants. The taste profile anal. of basic taste recombinants was generated via qHNMR in less than 15 min and compared with literature data acquired by LC-MS/MS and/or HPLC-UV/Vis and revealed identical results for all taste qualities. A determination of limit of detection (LoD) values for S/N = 50 of various proton signals with different integrals and multiplicities demonstrated that taste recognition thresholds of all basic tastants are far above those of LoD concentrations under the chosen conditions. Therefore, our exptl. setup is able to detect basic taste-active compounds well below their taste recognition thresholds.

Journal of Agricultural and Food Chemistry published new progress about 90-64-2. 90-64-2 belongs to alcohols-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Alcohol,Natural product, name is 2-Hydroxy-2-phenylacetic acid, and the molecular formula is C8H8O3, Recommanded Product: 2-Hydroxy-2-phenylacetic acid.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Koester, Roland published the artcileBoron compounds. XXIX. Catalyzed diethylborylation of alcohols and phenols, Product Details of C4H7BrO, the publication is Justus Liebigs Annalen der Chemie (1975), 352-72, database is CAplus.

The elimination of 1 Et group as ethane from Et3B below 80° by ROH or dihydroxy organic compounds with Me3CCO2BEt2 as catalyst gave Et2BOR (R = Me, Et, Bu, allyl, propargyl, naphthyl, etc.) and (Et2BO)2X (X = CH2CH2, (CH2)5, CH2CCCH2, 1,2-, 1,3-, 1,4-cyclohexanediyl, etc.). Other trialkylboranes react more slowly than Et3B, the rates decreasing: BEt3 > BPr3 > B(CHMe2)3 > B(CH2CHMe2)3. Borylations with BMe3 are very slow and do not proceed uniformly. Alkyl pivalates, pivalonitrile, and other derivatives of pivalic acid and derivatives of other carboxylic acids are less active as catalysts; the catalyzed diethylborylations of hydroxy compounds containing C:C or CC bonds, halogens, carboxylate and aromatic nitro groups all proceed without side reactions. The catalytic diethylborylation is effective for the quant. determination of hydroxy groups in alcs.

Justus Liebigs Annalen der Chemie published new progress about 50915-29-2. 50915-29-2 belongs to alcohols-buliding-blocks, auxiliary class Cyclopropanes, name is (1-Bromocyclopropyl)methanol, and the molecular formula is C4H7BrO, Product Details of C4H7BrO.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Reis, Joel S. published the artcileOxazoline as acceptor moiety for excited-state intramolecular proton transfer, Quality Control of 86-48-6, the publication is Tetrahedron (2018), 74(48), 6866-6872, database is CAplus.

Excited state intramol. proton transfer (ESIPT) is a widespread phenomenon that has been exploited in several anal. and technol. applications. Here we describe the synthesis of two ESIPT-active halogen-substituted naphthol-oxazolines that can be conveniently functionalized to develop tailored sensors, and a bis-oxazoline that showcases the potential of oxazolines to undergo double ESIPT. The photophys. properties of these compounds in solution were investigated using polar aprotic solvents and the results were rationalized using DFT/TD-DFT calculations

Tetrahedron published new progress about 86-48-6. 86-48-6 belongs to alcohols-buliding-blocks, auxiliary class Organic Pigment,Natural product, name is 1-Hydroxy-2-naphthoic acid, and the molecular formula is C11H8O3, Quality Control of 86-48-6.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts