Month: November 2022

Moon, Yejin published the artcileLight-Insensitive Organic Field-Effect Transistors with n-Type Conjugated Polymers Containing Dinitrothiophene Units, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Advanced Electronic Materials (2018), 4(11), n/a, database is CAplus.

Here, it is reported that organic field-effect transistors (OFETs) with n-type conjugated polymer, poly[{2,5-bis-(2-octhyldodecyl)-3,6-bis-(thien-2-yl)-pyrrolo[3,4-c]pyrrole-1,4-diyl}-co-{2,2′-(3,4-dinitrothiophene)]-5,5′-diyl}] (PODTPPD-DNT), can be operated without large disturbance by surrounding light. The PODTPPD-DNT polymer synthesized via the Stille coupling reaction could act as a channel layer for n-channel OFETs. Although the PODTPPD-DNT polymer shows a broad optical absorption from UV to near-IR parts up to 1000 nm, the OFETs with the PODTPPD-DNT channel layers do not almost respond to monochromatic (520 and 780 nm) and white light. The reason is assigned to the exciton quenching effect by two nitro groups in the polymer chain. The semitransparent OFETs with the 20 nm thick PODTPPD-DNT channel layers are also almost light-insensitive for operation under typical room light conditions.

Advanced Electronic Materials published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Nam, Doo H. published the artcileAn improved synthesis of captopril, Safety of 3-Bromo-2-methylpropanoic acid, the publication is Journal of Pharmaceutical Sciences (1984), 73(12), 1843-4, database is CAplus and MEDLINE.

An improved synthesis of captopril using methacrylic acid as the starting material is described. Treatment of methacrylic acid with a hydrogen halide gave the 3-halogneo-2-methylpropanoic acids, which were treated with SOCl₂ to yield the corresponding 3-halogeno-2-methylpropanoyl chlorides. Treatment of the chlorides with L-proline yielded the N-(R,S-3-halogeno-2-methylpropanoyl)-L-prolines (I, R = Br, Cl) (II) which were separated into optically pure R– and S-diastereoisomers using dicyclohexylamine. Treatment of (R)-II with methanolic NH₄SH gave captopril (I, R = SH).

Journal of Pharmaceutical Sciences published new progress about 56970-78-6. 56970-78-6 belongs to bromides-buliding-blocks, auxiliary class Bromide,Carboxylic acid,Aliphatic hydrocarbon chain,Inhibitor, name is 3-Bromo-2-methylpropanoic acid, and the molecular formula is C4H7BrO2, Safety of 3-Bromo-2-methylpropanoic acid.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Miclotte, Matthieu P. J. published the artcileTuning the Cloud-Point and Flocculation Temperature of Poly(2-(diethylamino)ethyl methacrylate)-Based Nanoparticles via a Postpolymerization Betainization Approach, Synthetic Route of 55788-44-8, the publication is ACS Polymers Au (2021), 1(1), 47-58, database is CAplus and MEDLINE.

The ability to tune the behavior of temperature-responsive polymers and self-assembled nanostructures has attracted significant interest in recent years, particularly in regard to their use in biotechnol. applications. Herein, well-defined poly(2-(diethylamino)ethyl methacrylate) (PDEAEMA)-based core-shell particles were prepared by RAFT-mediated emulsion polymerization, which displayed a lower-critical solution temperature (LCST) phase transition in aqueous media. The tertiary amine groups of PDEAEMA units were then utilized as functional handles to modify the core-forming block chem. via a postpolymn. betainization approach for tuning both the cloud-point temperature (T_CP) and flocculation temperature (T_CFT) of these particles. In particular, four different sulfonate salts were explored aiming to investigate the effect of the carbon chain length and the presence of hydroxyl functionalities alongside the carbon spacer on the particle’s thermoresponsiveness. In all cases, it was possible to regulate both T_CP and T_CFT of these nanoparticles upon varying the degree of betainization. Although T_CP was found to be dependent on the type of betainization reagent utilized, it only significantly increased for particles betainized using sodium 3-chloro-2-hydroxy-1-propanesulfonate, while varying the aliphatic chain length of the sulfobetaine only provided limited temperature variation. In comparison, the onset of flocculation for betainized particles varied over a much broader temperature range when varying the degree of betainization with no real correlation identified between T_CFT and the sulfobetaine structure. Moreover, exptl. results were shown to partially correlate to computational oligomer hydrophobicity calculations Overall, the innovative postpolymn. betainization approach utilizing various sulfonate salts reported herein provides a straightforward methodol. for modifying the thermoresponsive behavior of soft polymeric particles with potential applications in drug delivery, sensing, and oil/lubricant viscosity modification.

ACS Polymers Au published new progress about 55788-44-8. 55788-44-8 belongs to bromides-buliding-blocks, auxiliary class Bromide,Salt,Aliphatic hydrocarbon chain,Aliphatic hydrocarbon chain, name is Sodium 3-bromopropane-1-sulfonate, and the molecular formula is C3H6BrNaO3S, Synthetic Route of 55788-44-8.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Wiskur, Sheryl L. published the artcilepK_a Values and Geometries of Secondary and Tertiary Amines Complexed to Boronic Acids-Implications for Sensor Design, Synthetic Route of 166821-88-1, the publication is Organic Letters (2001), 3(9), 1311-1314, database is CAplus and MEDLINE.

The pK_a values and the geometries of secondary and tertiary amines adjacent to boronic acids (e.g. 2-(PhCH₂NRCH₂)C₆H₄B(OH)₂; R = H, Me) were determined using potentiometric and ¹¹B NMR titrations The studies showed that the secondary ammonium ion has a pK_a similar to that of the tertiary ammonium species, which gives tetrahedral B centers at pH values ≳5.5. Therefore, secondary amines as well as tertiary amines, when placed proximal to B centers, can be used to create tetrahedral boronic acids at neutral pH for diol complexation. The mol. structure of 2,6-(2-(2-((HO)₂B)C₆H₄CH₂NHCH₂)-4-pyrimidinyl)₂pyridine was determined by x-ray crystallog.

Organic Letters published new progress about 166821-88-1. 166821-88-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzyl bromide,Benzene,Boronic Acids,Boronic acid and ester, name is 2-(2-(Bromomethyl)phenyl)-5,5-dimethyl-1,3,2-dioxaborinane, and the molecular formula is C8H8O3, Synthetic Route of 166821-88-1.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Motornov, Vladimir published the artcileCopper(I)-Catalyzed Regioselective Chan-Lam N2-Vinylation of 1,2,3-Triazoles and Tetrazoles, Formula: C30H24BrCuN2P, the publication is Advanced Synthesis & Catalysis (2019), 361(14), 3306-3311, database is CAplus.

Copper-catalyzed coupling of π-deficient NH-azoles with vinylboronic acids or vinyltrifluoroborate salt provided a direct route to N2-vinyl-1,2,3-triazoles and N2-vinyltetrazoles. The coupling reaction was efficiently catalyzed by (phen)Cu(PPh₃)Br with low catalyst loading (5 mol%) under base-free conditions. The method was applicable for vinylation of unsubstituted, monosubstituted and disubstituted 1,2,3-triazoles with various functionalities with high N2-selectivity.

Advanced Synthesis & Catalysis published new progress about 25753-84-8. 25753-84-8 belongs to bromides-buliding-blocks, auxiliary class Copper, name is Bromo(1,10-phenanthroline)(triphenylphosphine)copper(I), and the molecular formula is C30H24BrCuN2P, Formula: C30H24BrCuN2P.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Dickner, Tim published the artcileStereoselective synthesis and binding properties of novel concave-shaped indolizino[3,4-b]quinolines, Product Details of C7H13BrSi, the publication is Journal fuer Praktische Chemie (Weinheim, Germany) (2000), 342(8), 804-811, database is CAplus.

Novel all-cis-configurated indolizino[3,4-b]quinoline receptors I [R = Me, R¹ = H, Ph(CH₂)₃O; R² = H, PhNHCO] were prepared via diastereoselective Lewis acid-catalyzed cyclization of N-arylimines II as a key step. In order to obtain the indolizino[3,4-b]quinoline I (R = R² = H; R¹ = Cl), an N-arylimine precursor II (III; R = Me₃Si; R¹ = Cl; R² = H) was prepared in 8 steps from L-prolinol. In contrast to the known β-effect of silyl groups, cyclization of III proceeded via α-carbenium ion species to give the diastereomeric products I (R = Me₃Si; R¹ = Cl; R² = H), which were desilylated to I (R = R² = H; R¹ = Cl). The association constants for receptors I decreased in the order I (R = R² = H; R¹ = Cl) > I (R = Me; R¹ = R² = H) > I (R= Me; R¹ = H; R² = PhNHCO) > I [R = Me; R¹ = Ph(CH₂)₃O; R² = H] for both acetic acid and N-Z-phenylalanine as substrates.

Journal fuer Praktische Chemie (Weinheim, Germany) published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C7H13BrSi, Product Details of C7H13BrSi.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Zhong, Mingmin published the artcileSynthesis of CoNi-layered double hydroxide on graphene oxide as adsorbent and construction of detection method for taste and odor compounds in smelling water, Safety of 1-Bromooctane, the publication is Journal of Hazardous Materials (2022), 128227, database is CAplus and MEDLINE.

Taste and odor (T&O) compounds are important water pollutant, some of which are toxic. The relevant studies are all expand upon the well-known T&O compounds but for the unknown odors in smelling water. In this work, a method combining purge and trap with gas chromatograph-mass spectrometer (PT-GC/MS) and disperse solid-phase extraction with gas chromatograph (GC) was first proposed to detect T&O compounds in unknown odorous water accurately. Firstly, PT-GC/MS was used for a qual. test on unknown odors in smelling water and determine the analytes. The hollow CoNi-layered double hydroxide (LDH) on graphene oxide (GO) was then used as a composite adsorbent to pretreat the water, in which the GO provided large sp. surface, and the LDH worked as a confinement cavity to enhance capture and retention capacity for volatile organic compounds (VOCs). According to the properties of T&O compounds determined by PT-GC/MS in water, a corresponding GC method was established for accurately quant. anal. In this paper, five T&O compounds were detected simultaneously, including di-Me sulfide, meistylene, N, N-dimethylbenzylamine, 2, 4-dimethylbenzaldehyde and 2, 4-di-tert-butylphenol. Extraction parameters were optimized, including ratio of desorption solvent, amount of adsorbent, pH value, etc. Under the optimal conditions, the detection limits for anal. were 1.14 μg/L to 3.07 mg/L. The satisfactory recoveries were 94-98%. Furthermore, two optimal determination outcomes of odor waters from different places support the practicability of the method, which is expected to be widely used in the detection of unknown odors in smelling water.

Journal of Hazardous Materials published new progress about 111-83-1. 111-83-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromooctane, and the molecular formula is C18H28N2O7, Safety of 1-Bromooctane.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Carrera, Elisa I. published the artcileA Mechanistic Study of Halogen Addition and Photoelimination from π-Conjugated Tellurophenes, Application In Synthesis of 594-81-0, the publication is Journal of the American Chemical Society (2016), 138(8), 2678-2689, database is CAplus and MEDLINE.

The ability to drive reactivity using visible light is of importance for many disciplines of chem. and has significant implications for sustainable chem. Identifying photochem. active compounds and understanding photochem. mechanisms is important for the development of useful materials for synthesis and catalysis. Here we report a series of photoactive diphenyltellurophene compounds bearing electron-withdrawing and electron-donating substituents synthesized by alkyne coupling/ring closing or palladium-catalyzed ipso-arylation chem. The redox chem. of these compounds was studied with respect to oxidative addition and photoelimination of bromine, which is of importance for energy storage reactions involving X₂. The oxidative addition reaction mechanism was studied using d. functional theory, the results of which support a three-step mechanism involving the formation of an initial η¹ association complex, a monobrominated intermediate, and finally the dibrominated product. All of the tellurophene derivatives undergo photoreduction using 430, 447, or 617 nm light depending on the absorption properties of the compound Compounds bearing electron-withdrawing substituents have the highest photochem. quantum efficiencies in the presence of an alkene trap, with efficiencies of up to 42.4% for a pentafluorophenyl-functionalized tellurophene. The photoelimination reaction was studied in detail through bromine trapping experiments and laser flash photolysis, and a mechanism is proposed. The photoreaction, which occurs by release of bromine radicals, is competitive with intersystem crossing to the triplet state of the brominated species, as evidenced by the formation of singlet oxygen. These findings should be useful for the design of new photochem. active compounds supported by main-group elements.

Journal of the American Chemical Society published new progress about 594-81-0. 594-81-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 2,3-Dibromo-2,3-dimethylbutane, and the molecular formula is C6H12Br2, Application In Synthesis of 594-81-0.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Wu, Jicheng published the artcilePhotoredox-Catalyzed Cross-Coupling of Enamides for the Assembly of β-Difluoroimine Synthons, Category: bromides-buliding-blocks, the publication is Organic Letters (2017), 19(20), 5653-5656, database is CAplus and MEDLINE.

A photoredox-catalyzed formal C_sp3-C_sp3 cross-coupling reaction of enamides with bromodifluoro compounds is established. The resulting gem-difluoromethylenated γ-imines indicated high stability, excellent E/Z control, and broad functional group tolerance. These synthetic intermediates can efficiently transfer to difluoromethylenated γ-amino acids or δ-amino alcs. Mechanistic anal. indicates that a radical/SET mechanism proceeding via a difluoroalkyl radical may be involved in the catalytic cycle.

Organic Letters published new progress about 401-55-8. 401-55-8 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Aliphatic hydrocarbon chain,Ester, name is Ethylbromofluoroacetate, and the molecular formula is C6H8O3, Category: bromides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Cleveland, Forrest F. published the artcileSubstituted ethanes. II. Raman and infrared spectra of 2,3-dibromo-2,3-dimethylbutane, 2,2,3,3-tetramethylbutane, Product Details of C6H12Br2, the publication is Journal of Chemical Physics (1950), 1320-4, database is CAplus.

cf. C.A. 39, 2254.3. Raman displacements and infrared absorption wave numbers for 2,3-dibromo-2,3-dimethylbutane and 2,2,3,3-tetramethylbutane (hexamethylethane) are reported, together with depolarization factors for the Raman lines and relative intensities for both the Raman lines and the infrared absorption bands. The spectra were obtained in both benzene and CCl₄ solutions and the infrared measurements covered the region 400-5000 cm^-1. The results indicate that both mols. possess a center of symmetry and that the structure is the same in the two solvents. The dipole moment of 1.01 D. obtained by Mizushima, Morino, and Miyagawa (private communication) for 2,3-dibromo-2,3-dimethylbutane in CCl₄ solution can be explained by oscillations of 48° amplitude about the equilibrium trans position. Cf. C.A. 38, 3908.7.

Journal of Chemical Physics published new progress about 594-81-0. 594-81-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 2,3-Dibromo-2,3-dimethylbutane, and the molecular formula is C6H12Br2, Product Details of C6H12Br2.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary