Tag: M.W=200-250

Isa Ziembowicz, Francieli published the artcileThermodynamics of aggregation and modulation of Rheo-Thermal properties of hydroxypropyl cellulose by imidazolium ionic liquids, Application of 1-Bromododecane, the publication is Journal of Molecular Liquids (2022), 119314, database is CAplus.

Mixtures based on cellulose derivatives/ionic liquids (ILs) are potential viscosity modifiers for enhanced oil recovery (EOR). This paper investigates the thermodn. of monocationic imidazolium ionic liquids (1-alkyl-3-methylimidazolium bromide, CnMIMBr) aggregation with hydroxypropyl cellulose (HPC) in the dilute regime and the modulation of its rheol. and thermal properties in the semi-dilute regime. The outcomes showed that binding occurs by hydrophobic interactions between the alkyl chain of ILs and hydroxypropyl group on HPC and by ion-dipole interactions, and it is driven by entropy. The addition of ILs produced a significant increase in the HPC solutions viscosity, which depends on the concentration and alkyl chain length of the ILs (n = 10, 12, 14, 16). Moreover, the presence of ILs produces an effect salt-in delaying the HPC phase separation These findings highlight the role of ILs on the rheol. and thermal properties of HPC, opening new possibilities for the design of new complex mixtures

Journal of Molecular Liquids published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Application of 1-Bromododecane.

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

Gu, Jilong published the artcileAnhydrous proton conduction in protic ionic liquid crystals formed by 1-alkyl-3H-imidazolium hydrogen sulfates, Related Products of bromides-buliding-blocks, the publication is Ionics (2022), 28(5), 2293-2300, database is CAplus.

Dynamic self-assembly of liquid crystals favors the formation of hydrogen bond networks essential for anhydrous proton conduction. To endow liquid crystals with inherently exchangeable protons for proton conduction, protic 1-alkyl-3H-imidazolium hydrogen sulfates ([C_nIm][HSO₄]) with different lengths of alkyl chains are synthesized. Interdigitated smectic A_d (S_Ad) liquid crystal phases are observed for [C_nIm][HSO₄], in which the protic ionic pairs aggregate into lamellas. Electrochem. characterization reveals that the anhydrous proton conductivity of [C_nIm][HSO₄] reaches up to 5.3 mS cm^-1 in the S_Ad phase. The single fuel cells fabricated from the [C_nIm][HSO₄]@PVDF supported membranes exhibit a peak power d. of 2.6 mW cm^-2 at 130 °C under non-humidified conditions. It was the enriched lamellar hydrogen bond networks formed by the protic ionic pairs that contribute to the anhydrous proton conduction. The protic ionic liquid crystals possess a great potential to construct electrochem. devices involving anhydrous proton conduction.

Ionics published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Related Products of bromides-buliding-blocks.

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

Budnik, A. G. published the artcileAction of electrophilic agents on polyfluoro aromatic compounds. XI. Nitration and halogenation of 2,3,5,6-tetrafluorophenol, Application In Synthesis of 1998-61-4, the publication is Zhurnal Organicheskoi Khimii (1974), 10(9), 1923-7, database is CAplus.

Nitration, chlorination, bromination and iodination of 2,3,5,6-F4C6H-OH gave 26-70% the phenol I (X = NO2, Cl, Br, iodo). Reduction of I (X = NO2) gave the corresponding amine I (X = NH2), which was methylated to give the anisidine II.

Zhurnal Organicheskoi Khimii published new progress about 1998-61-4. 1998-61-4 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Benzene,Phenol, name is 4-Bromo-2,3,5,6-tetrafluorophenol, and the molecular formula is C6HBrF4O, Application In Synthesis of 1998-61-4.

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

Savanur, Hemantkumar M. published the artcileLibraries of C-5 Substituted Imidazoles and Oxazoles by Sequential Van Leusen (VL)-Suzuki, VL-Heck and VL-Sonogashira in Imidazolium-ILs with Piperidine-Appended-IL as Base, Synthetic Route of 243455-57-4, the publication is European Journal of Organic Chemistry (2018), 2018(38), 5285-5288, database is CAplus.

Facile access to diverse C5-substituted imidazoles and oxazoles via sequential Van Leusen-Suzuki, Van Leusen-Heck, and Van Leusen-Sonogashira protocols, employing imidazolium-ILs as solvents along with piperidine-appended imidazolium [PAIM][NTf₂] as task-specific basic IL has been demonstrated, in a high-yielding one-pot method, starting with readily available aldimines (for imidazole) or aldehydes (for oxazole) and tosylmethyl isocyanide (TOSMIC), under mild conditions with potential for recycling and reuse of the IL solvent. The scope of the method is supported 49 examples.

European Journal of Organic Chemistry published new progress about 243455-57-4. 243455-57-4 belongs to bromides-buliding-blocks, auxiliary class Oxazole,Bromide,Benzene, name is 5-(3-Bromophenyl)oxazole, and the molecular formula is C9H6BrNO, Synthetic Route of 243455-57-4.

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

Winum, Jean-Yves published the artcileStudy of the Michaelis-Arbuzov reaction during ultrasonic activation, HPLC of Formula: 66197-72-6, the publication is Phosphorus, Sulfur and Silicon and the Related Elements (1997), 83-88, database is CAplus.

The use of ultrasonic activation in Michaelis-Arbuzov reaction promote a byproduct in the case of silyl derivatives and in the synthesis of XCH₂P(O)(OEt)₂ (X = I Br). A mechanism is proposed in which the phosphite undergoes a nucleophilic attack on the quasiphosphonium ion in place of the halide species.

Phosphorus, Sulfur and Silicon and the Related Elements published new progress about 66197-72-6. 66197-72-6 belongs to bromides-buliding-blocks, auxiliary class Aliphatic Chain, name is Diethyl (bromomethyl)phosphonate, and the molecular formula is C18H23N3O4S, HPLC of Formula: 66197-72-6.

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

Hadei, Niloufar published the artcileRoom-Temperature Negishi Cross-Coupling of Unactivated Alkyl Bromides with Alkyl Organozinc Reagents Utilizing a Pd/N-Heterocyclic Carbene Catalyst, COA of Formula: C7H13BrSi, the publication is Journal of Organic Chemistry (2005), 70(21), 8503-8507, database is CAplus and MEDLINE.

A high-yielding cross-coupling reaction of unactivated alkyl bromides possessing β-hydrogens with alkylzinc halides utilizing a Pd/N-heterocyclic carbene (NHC) catalyst at room temperature is described. A variety of Pd sources, Pd₂(dba)₃, Pd(OAc)₂, or PdBr₂, with the com. available ligand precursor 1,3-bis(2,6-diisopropylphenyl)imidazolium chloride successfully coupled 1-bromo-3-phenylpropane with n-butylzinc bromide in THF/NMP. An investigation of different NHC precursors showed that the bulky 2,6-diisopropylphenyl moiety was necessary to achieve high coupling yields (75-85%). The corresponding Et analog was moderately active (11%). A range of unsym. NHC precursors were prepared and evaluated. The ligand precursor containing one 2,6-diisopropylphenyl and one 2,6-diethylphenyl afforded the coupling product in 47% yield, clearly suggesting a direct relationship between the steric topog. created by the flanking N-substituents and catalyst activity. Under optimal conditions, a number of alkyl bromides and alkylzinc halides possessing common functional groups (amide, nitrile, ester, acetal, and alkyne) were effectively coupled (61-92%). It is noteworthy that β-substituted alkyl bromides and alkylzinc halides successfully underwent cross-coupling. Also, under these conditions alkyl chlorides were unaffected.

Journal of Organic Chemistry 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, COA of Formula: C7H13BrSi.

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

Hadei, Niloufar published the artcileThe First Negishi Cross-Coupling Reaction of Two Alkyl Centers Utilizing a Pd-N-Heterocyclic Carbene (NHC) Catalyst, SDS of cas: 69361-41-7, the publication is Organic Letters (2005), 7(17), 3805-3807, database is CAplus and MEDLINE.

The development of an NHC-based system capable of cross-coupling sp³-sp³ centers in high yield has been a long-standing challenge. This communication describes the use of a Pd-NHC catalytic system that achieves room-temperature Negishi cross-couplings of unactivated, primary bromides and alkyl organozinc reagents with a variety of functionality. E.g., alkyl-alkyl Negishi cross-coupling of PhCH₂CH₂CH₂Br and BuZnBr in presence of Pd₂(dba)₃ and 1,3-bis(2,6-diisopropylphenyl)imidazolium chloride gave up to 75% heptylbenzene.

Organic Letters 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, SDS of cas: 69361-41-7.

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

O’Brien, Christopher J. published the artcileTowards the rational design of palladium-N-heterocyclic carbene catalysts by a combined experimental and computational approach, Application of (4-Bromobut-1-yn-1-yl)trimethylsilane, the publication is Tetrahedron (2005), 61(41), 9723-9735, database is CAplus.

A combined exptl. and computational approach towards the development of Pd-NHC catalysts is described. A range of benzimidazolylidinium ligands incorporating electron-rich and electron-poor substituents were prepared and evaluated in the Suzuki reaction. The most electron-rich ligand showed the highest catalytic activity. Based on this information, the first alkyl-alkyl Negishi cross-coupling reaction protocol was developed. Evaluation of N,N’-diaryl-(4,5-dihydro)imidazolylidinium ligands showed a strong dependence on the steric topog. around the metal center. A computational study of the most active ligand in the Negishi reaction, its Pd(0) and PdCl₂-complexes and related structures were modeled at the B3LYP/DZVP and HF/3-21G levels of theory. The potential energy hypersurfaces flattened with increase in ligand size. Binding energies were computed for carbene/Pd(0) adducts (in the range âˆ?1-40 kcal mol^-1), roughly double that for PH₃ (âˆ?6 kcal mol^-1). Weak intramol. interactions were found using AIM analyses.

Tetrahedron 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, Application of (4-Bromobut-1-yn-1-yl)trimethylsilane.

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

Simon, Meike published the artcileDiastereoselective Intramolecular Carbolithiations of Stereodefined Secondary Alkyllithiums Bearing a Remote Alkynylsilane, Application In Synthesis of 69361-41-7, the publication is Organic Letters (2018), 20(12), 3518-3521, database is CAplus and MEDLINE.

Various secondary alkyl iodides bearing a remote alkynylsilane underwent intramol. carbolithiations triggered by an I/Li-exchange performed at -100° using t-BuLi (2.5 equiv). The resulting alkenyllithiums were stereoselectively converted to tetrasubstituted cyclopentane exo-alkylidenes. After Pd-catalyzed hydrogenation, cyclopentanes and cis-bicyclo[4.3.0]nonanes were obtained with stereocontrol of four contiguous centers.

Organic Letters 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 C4H5ClN2S, Application In Synthesis of 69361-41-7.

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

Nakum, Kiran J. published the artcileThe influence of lateral hydroxyl group and molecular flexibility on the mesogenic behavior of a new homologous series based on thiophene-chalcone: Synthesis, characterization, crystal structure and DFT study, Name: 1-Bromododecane, the publication is Journal of Molecular Structure (2022), 132891, database is CAplus.

A new homologous series of rod shaped calamite liquid crystals, I [R = Et, decyl, octadecyl, etc.] based on thiophene-chalcone was prepared by condensation of 2-hydroxy-4-n-alkoxybenzaldehydes (n = 2 to 8, 10, 12, 14, 16, 18) with (E)-1-(4-aminophenyl)-3-(thiophen-2-yl)prop-2-en-1-one. FT-IR, ¹H NMR, ¹³C NMR and mass spectroscopy were used to characterize synthesized compds I. The liquid crystal behavior of all synthetic compounds I was investigated using Differential Scanning Calorimeter (DSC) and Polarizing Optical Microscope (POM). Lower members of the homologous series, n-heptyloxy to n-dodecyloxy , were nematogenic, and higher members, n-tetradecyloxy to n-octadecyloxy , were smectogenic, whereas n-ethoxy to n-pentyloxy derivatives were non-mesogenic, and n-hexyloxy exhibited monotropic nematic phase. The n-pentyloxy derivative crystallized under monoclinic, space group P2/c with unit cell dimensions a = 16.1723(9) Å, b = 5.8603(3) Å, c = 22.4320(12) Å, β = 100.153(2) , V = 2092.69(9) Å3. The ethoxy derivative was subjected to DFT (d. functional theory) level computations and complete geometric optimization utilizing B3LYP/6-311G (d, p) basis sets and results were compared with structurally similar compound

Journal of Molecular Structure published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Name: 1-Bromododecane.

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