Month: December 2022

Zhang, Luqing published the artcileSynthesis and Surface Activities of Novel Succinic Acid Double-Tailed Sulfonate Fluorinated Surfactants, Formula: C4H7F3O2, the publication is Journal of Surfactants and Detergents (2016), 19(3), 559-565, database is CAplus.

In this study, four environmentally friendly succinic acid double-tailed sulfonate fluorinated surfactants were synthesized from maleic anhydride, fluoroalkyl alcs., namely 1-(1H,1H,7H-Dodecafluoroheptyloxy) ethanol, 1-(1H,1H,5H-octafluoropentyloxy) ethanol, 1-(1H,1H,3H-tetrafluoropropoxy) ethanol, 1-(1H,1H-trifluoroethyloxy) ethanol, and sodium hydrogensulfite. The surfactant structure was characterized by FT-IR, ¹H NMR, and ¹⁹F NMR . Thermogravimetric results showed that the fluorinated surfactants were stable up to relatively high temperature The Krafft points of the four novel succinic acid double-tailed sulfonate fluorinated surfactants were all below 0°C. The lowest CMC value for the synthesized four double-tailed fluorine surfactants is about 0.076 mmol L^-1, far less than that of ammonium perfluorooctanoate (PFOA), demonstrating that double-tailed surfactants have higher surface activity than surfactants with one fluoroalkyl chain. The replacement of alkyl groups with oxyethylene groups enhances the hydrophilicity of the obtained fluorinated surfactants. Based on these findings, the synthesized surfactants may be environmentally friendly alternatives to PFOA and exhibit promising potential in industry applications.

Journal of Surfactants and Detergents published new progress about 2358-54-5. 2358-54-5 belongs to ethers-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2-(2,2,2-Trifluoroethoxy)ethanol, and the molecular formula is C38H74Cl2N2O4, Formula: C4H7F3O2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Kovacova, J. published the artcileComparison of redox transformations in platinum(IV) and copper(II) complexes with thiourea as ligand, Related Products of ethers-buliding-blocks, the publication is Chemicke Zvesti (1980), 34(2), 179-83, database is CAplus.

PtL₂Cl₄ and PtL’₂Cl₄ (L = N,N,N‘,N‘-tetramethylthiourea; L’ = N,N‘-ethylenethiourea) reacted with thiourea to give Pt(II) complexes. The possible course of substitution and redox processes was inferred indirectly from chem. changes and the reaction products. Differences in the redox changes of Pt(IV) and Cu(II) complexes after introduction of thiourea into the inner sphere are discussed on the basis of the mutual effect.

Chemicke Zvesti published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Related Products of ethers-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Cumming, W. published the artcileControl of chromophore length in electroluminescent polymers. Part II. Mainchain polymers, COA of Formula: C15H24O2, the publication is Journal of Macromolecular Science, Pure and Applied Chemistry (1996), A33(9), 1301-1316, database is CAplus.

Electroluminescence emission has been demonstrated in mainchain polyesters and a structurally analogous polyamide. High-mol.-weight polyesters were synthesized by condensation of a dihydroxy-functionalized, substituted, phenylene vinylene analog, e.g., the lumophore, with a variety of dicarboxylic acid chlorides. The structure and hence the conjugation length of the emitting comonomer was predetermined prior to polymerization Since the diacid moieties did not contribute to the conjugation length and hence the emission wavelength, the structure of the diacid was determined on the basis of its ease of synthesis, reactivity, and solubilizing ability in the final polymer. In each of the polyesters, the electroluminescence wavelength of light-emitting diodes made from these polymers was similar to their photoluminescence emission spectrum in solution and the solid state at room temperature The emission wavelengths ranged from blue to green. The polyamide exhibits a very broad-band, nearly white electroluminescence. Diodes made from these polymers typically have external efficiencies �0.003% with low turn-on voltages, e.g., 6-20 V.

Journal of Macromolecular Science, Pure and Applied Chemistry published new progress about 146370-51-6. 146370-51-6 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether, name is 1-((2-Ethylhexyl)oxy)-4-methoxybenzene, and the molecular formula is C15H24O2, COA of Formula: C15H24O2.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Malhotra, K. C. published the artcileOxidation of thiourea by N-bromosuccinimide. A kinetic study, Safety of Formamidine disulfide dihydrochloride, the publication is Journal of the Indian Chemical Society (1987), 64(9), 551-4, database is CAplus.

The kinetics of oxidation of thiourea (to formamidine disulfide) with NBS were studied. The oxidation is second order, first order each in thiourea and NBS. The rate increases with increase of pH and decrease of dielec. constant of the medium. The addition of NaCl and NaNO₃ electrolytes to the reaction mixture shows a neg. salt-effect.

Journal of the Indian Chemical Society published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Safety of Formamidine disulfide dihydrochloride.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Francisco, Vitor published the artcileKinetic study of an autocatalytic reaction: nitrosation of formamidine disulfide, Application In Synthesis of 14807-75-1, the publication is New Journal of Chemistry (2008), 32(12), 2292-2298, database is CAplus.

The reaction kinetics for the acid nitrosation of formamidine disulfide (FDS) show an autocatalytic behavior that arises from the fact that the thiocyanate ion formed as a product acts as a powerful catalyst for the nitrosation reaction. In the presence of added nucleophiles the suppression of the autocatalytic route results from competition for the nitrous acid between the added halides and the thiocyanate anion, which is formed as a reaction product. Anal. of the kinetic data enabled extraction of the bimol. rate constants, k_NO⁺ = (3.2 ± 1.8) × 10¹⁰ M^-1 s^-1; k_NOSCN = (2.1 ± 0.2) × 10⁵ M^-1 s^-1; k_NOBr = (9.4 ± 0.2) × 10⁶ M^-1 s¹ and k_NOCl = (4.0 ± 0.2) × 10⁷ M^-1 s^-1, for the pathways catalyzed by SCN^–, Br^– and Cl^–, resp. Kinetic results are consistent with the attack on the nitrosating agent as the rate limiting step, i.e., the nitrosation of FDS behaves in a similar manner to the nitrosation of an amine. Rather different behavior is found for other substrates with an imino moiety adjacent to an amino nitrogen, such as the guanidines, which react by a mechanism in which the rate limiting step is the reorganization of the nitrosated substrate.

New Journal of Chemistry published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C2H8Cl2N4S2, Application In Synthesis of 14807-75-1.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Tomas-Mendivil, Eder published the artcileExploring Rhodium(I) Complexes [RhCl(COD)(PR₃)] (COD = 1,5-Cyclooctadiene) as Catalysts for Nitrile Hydration Reactions in Water: The Aminophosphines Make the Difference, Name: 2-Methoxyacetamide, the publication is ACS Catalysis (2014), 4(6), 1901-1910, database is CAplus.

Several rhodium(I) complexes, [RhCl(COD)(PR₃)], containing potentially cooperative phosphine ligands, have been synthesized and evaluated as catalysts for the selective hydration of organonitriles into amides in water. Among the different phosphines screened, those of general composition P(NR₂)₃ led to the best results. In particular, complex [RhCl(COD){P(NMe₂)₃}] was able to promote the selective hydration of a large range of nitriles in water without the assistance of any additive, showing a particularly high activity with heteroaromatic and heteroaliph. substrates. Employing this catalyst, the antiepileptic drug rufinamide was synthesized in high yield by hydration of 4-cyano-1-(2,6-difluorobenzyl)-1H-1,2,3-triazole. For this particular transformation, complex [RhCl(COD){P(NMe₂)₃}] was more effective than related ruthenium catalysts.

ACS Catalysis published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C11H10N4, Name: 2-Methoxyacetamide.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Fernandez-Llamazares, Ana I. published the artcileN-Triethylene glycol (N-TEG) as a surrogate for the N-methyl group: application to Sansalvamide A peptide analogs, Recommanded Product: (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, the publication is Chemical Communications (Cambridge, United Kingdom) (2013), 49(57), 6430-6432, database is CAplus and MEDLINE.

The authors have studied the N-triethylene glycol (N-TEG) group as a surrogate for the N-Me group in Sansalvamide A peptide. The five N-TEG and N-Me analogs of this cyclic pentapeptide were synthesized, and their biol. activity, lipophilicity and conformational features were compared.

Chemical Communications (Cambridge, United Kingdom) published new progress about 77128-73-5. 77128-73-5 belongs to ethers-buliding-blocks, auxiliary class Inhibitor, name is (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid, and the molecular formula is C25H23NO4, Recommanded Product: (S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-3-phenylpropanoic acid.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Wang, Shun published the artcileHeat effect in oxidation of thiourea, HPLC of Formula: 14807-75-1, the publication is Zhongguo Kuangye Daxue Xuebao (2004), 33(4), 375-378, database is CAplus.

The enthalpies of combustion of thiourea, formamidine disulfide dihydrochloride, thiourea dioxide, and thiourea trioxide were measured using an oxygen bomb calorimeter, and from which the molar standard enthalpies of formation of formamidine disulfide dihydrochloride, thiourea dioxide, and thiourea trioxide were obtained with values of 8.19, -431.49 and -833.32 kJ/mol, resp. Further, the molar standard reaction enthalpies, for the formation of formamidine disulfide dihydrochloride, thiourea dioxide and thiourea trioxide via the reactions between thiourea and hydrogen peroxide, were also calculated utilizing the data of combustion enthalpies or formation enthalpies. The two calculations are almost the same. Their values are 127.11-127.12, -543.66–543.64 and -1 043.56–1 043.53 kJ/mol, resp.

Zhongguo Kuangye Daxue Xuebao published new progress about 14807-75-1. 14807-75-1 belongs to ethers-buliding-blocks, auxiliary class Salt,Thiourea,Amine,Aliphatic hydrocarbon chain, name is Formamidine disulfide dihydrochloride, and the molecular formula is C6H4ClNO2, HPLC of Formula: 14807-75-1.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Zheng, Qiaoran published the artcileEffects of drying methods on colour, amino acids, phenolic profile, microstructure and volatile aroma components of Boletus aereus slices, Recommanded Product: 1,2-Dimethoxybenzene, the publication is International Journal of Food Science and Technology (2022), 57(8), 5164-5174, database is CAplus.

This study is to investigate the effects of hot air drying (HD) at 60-80°C (HD-60, HD-70 and HD-80), microwave pretreatment combined with HD (MHD), ultrasound pretreatment combined with HD (UHD) and vacuum freeze drying (FD) on the quality of Boletus aereus slices. Key characteristics, including color, free amino acids, microstructure, volatile aroma components, phenolic profile and antioxidant activity, were studied. Amongst these drying methods, FD was the best way to preserve color and volatiles of Boletus aereus slices. Fifteen amino acids were detected in Boletus aereus slices, and HD-60 showed a higher content of total amino acids than other drying regimes. Two phenolic acids were identified in Boletus aereus slices, namely, protocatechuic acid and p-hydroxybenzoic acid. MHD presented the highest content of phenolic compounds, followed by FD. Antioxidant capacity was pos. correlated with phenolic compounds of Boletus aereus slices. Moreover, the cell structure of Boletus aereus slices was damaged after drying, and FD had a more porous structure than other drying methods. These results will be beneficial to the further industrial production of Boletus aereus slices.

International Journal of Food Science and Technology published new progress about 91-16-7. 91-16-7 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether,Inhibitor,Inhibitor,Inhibitor, name is 1,2-Dimethoxybenzene, and the molecular formula is C7H14N2, Recommanded Product: 1,2-Dimethoxybenzene.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem

Ma, Lijuan published the artcileCharacterization of the key active aroma compounds in Pu-erh tea using gas chromatography-time of flight/mass spectrometry-olfactometry combined with five different evaluation methods, Synthetic Route of 91-16-7, the publication is European Food Research and Technology (2022), 248(1), 45-56, database is CAplus.

The aroma characteristics of Pu-erh tea were studied in this work. A total of 117 volatile compounds were identified by HSSPME combined with GC-TOF/MS, of which 29 active aroma compounds were identified by olfactometry. The active aroma compounds of Pu-erh tea were analyzed by intensity aroma (IA), aroma extraction dilution (AEDA), sensory quantification value (MF), detection frequency (DFA) and odor activity value (OAV). 24, 21 and 23 active aroma components were identified by DFA, AEDA and OAV, while 20 by IA and MF. Recombination of the obtained active aroma components indicated that OAV method was best for determining the active aroma compounds as the aroma profle of OAV recombination model was the most similar to that of Pu-erh tea sample. Omission test of the OAV recombination model furtherly identifed 19 characteristic active aroma compounds of Pu-erh tea, and linalool, 1,2,3-trimenthoxybenzebe, 1,2,4-trimethoxybenzene and α-ionone were the key characteristic active aromatic compounds

European Food Research and Technology published new progress about 91-16-7. 91-16-7 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether,Inhibitor,Inhibitor,Inhibitor, name is 1,2-Dimethoxybenzene, and the molecular formula is C8H10O2, Synthetic Route of 91-16-7.

Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem