Category: bromides-buliding-blocks

Van Allen, Derek published the artcileCopper-Catalyzed Synthesis of Unsymmetrical Triarylphosphines, Application In Synthesis of 25753-84-8, the publication is Journal of Organic Chemistry (2003), 68(11), 4590-4593, database is CAplus and MEDLINE.

Various triarylphosphines were prepared in good yields by coupling diphenylphosphine and aryl iodides with catalytic amounts of CuI in the presence of either K₂CO₃ or Cs₂CO₃. CuI was chosen after screening various copper salts, such as CuBr and CuCl, and complexes, i.e., Cu(PPh₃)₃Br (1), Cu(neocup)PPh₃Br (neocup = neocuproine) (2), Cu(phen)PPh₃Br (phen = phenanthroline) (3), and Cu(neocup)₂Br·H₂O (4). Catalysts 1–4 were prepared and identified by comparison with previously published x-ray crystallog. data. In an example cross-coupling reaction, 1-naphthyldiphenylphosphine was prepared via reaction of diphenylphosphine and 1-iodonaphthalene in the presence of CuI and Cs₂CO₃, and analyzed by x-ray crystallog. This method tolerates a variety of functional groups, such as ketones and esters, and does not require the use of expensive additives or harsh reaction conditions, and is palladium free.

Journal of Organic Chemistry 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 C24H12, Application In Synthesis of 25753-84-8.

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

Slegel, P. published the artcileEnantiomeric separation of chiral carboxylic acids, as their diastereomeric carboxamides, by thin-layer chromatography, Product Details of C4H7BrO2, the publication is Journal of Pharmaceutical and Biomedical Analysis (1987), 5(7), 665-73, database is CAplus and MEDLINE.

A thin-layer chromatog. (TLC) method is described for the enantiomeric separation of chiral carboxylic acids using chiral derivatization and nonchiral TLC conditions (ordinary plates and mobile phases) to sep. the diastereomeric carboxamides obtained. New chiral derivatizing agents, “levobase” (1R, 2R)-(-)-1-(4-nitrophenyl)-2-amino-1,3-propanediol, and “dextrobase” (the enantiomer of levobase) are used for carboxamide formation in the presence of dicyclohexylcabodiimide as coupling agent. The procedure is very simple and convenient to carry out. Good resolution is obtained for a wide range of carboxylic acid enantiomeric pairs containing 1 to 2 chiral centers.

Journal of Pharmaceutical and Biomedical Analysis 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 Al2H32O28S3, Product Details of C4H7BrO2.

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

Depre, Dominique published the artcileOrigin of the E/Z Selectivity in the Synthesis of Tetrasubstituted Olefins by Wittig Reaction of α-Fluorophosphonium Ylides: An Explanation for the Low Stereoselectivity Observed in Reactions of α-Alkoxy Aldehydes, Application In Synthesis of 401-55-8, the publication is Organic Letters (2017), 19(6), 1414-1417, database is CAplus and MEDLINE.

A series of tetrasubstituted fluoroalkenes were synthesized in good yield and high E/Z selectivity (up to 96/4) by Wittig reaction between α-heterosubstituted ketones and α-fluorophosphonium ylides. A detailed study of factors that control stereoselectivity in these reactions shows that stereoselectivity is the result of stabilizing CH···F and N···C=O interactions in the addition TS leading to the E isomer. This anal. provides a rationale for the observed decrease in selectivity for reactions of stabilized ylides with α-alkoxy aldehydes.

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 C4H6BrFO2, Application In Synthesis of 401-55-8.

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

Donkervoort, Johannes G. published the artcileNovel tridentate diamino organomanganese(II) complexes as homogeneous catalysts in manganese(II)/copper(I) catalyzed carbon-carbon bond forming reactions, Name: (4-Bromobut-1-yn-1-yl)trimethylsilane, the publication is Journal of Organometallic Chemistry (1998), 558(1-2), 61-69, database is CAplus.

The new, paramagnetic arylmanganese(II) complex Li[MnCl₂(NCN)] (2, NCN = [C₆H₃(CH₂NMe₂)₂-2,6]^–) was obtained in high yield from the reaction of MnCl₂ and [Li(NCN)]₂ in a 2:1 molar ratio. In THF solution, 2 is likely an ionic species [Li(THF)_n][MnCl₂(NCN)] (mol. weight determination and conductivity measurements), while magnetic measurements indicate that a high spin d⁵ Mn(II) center is present. Subsequent reaction of 2 with RLi afforded [MnR(NCN)] (R = Me, Bu). Complex 2, using CuCl as a co-catalyst, is an effective catalyst system for cross-coupling of Grignard reagents with alkyl bromides and the 1,4-addition of organomagnesium halides to α,β-unsaturated ketones. No further additives or co-solvents are necessary. For both reactions a dramatic decrease in reaction times is observed when compared to standard Mn/Cu systems. Alkyl bromides with unsaturated or heteroatom functionalities can be cross-coupled. Also, excellent reactivity towards normally unreactive β,β-disubstituted ketones was observed in the 1,4-addition reaction.

Journal of Organometallic 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, Name: (4-Bromobut-1-yn-1-yl)trimethylsilane.

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

Donkervoort, Johannes G. published the artcileNovel organomanganese(II) complexes active as homogeneous catalysts in manganese(II)/copper(I) catalyzed carbon-carbon bond formation reactions, Name: (4-Bromobut-1-yn-1-yl)trimethylsilane, the publication is Recueil des Travaux Chimiques des Pays-Bas (1996), 115(11/12), 547-548, database is CAplus.

Novel organomanganese complexes 2,6-(Me₂NCH₂)₂C₆H₂X (I; X = MnLiCl₂), prepared from I (X = Li) and MnCl₂, reacted with RLi (R = Me, Bu, Ph) to give the corresponding I (X = R). These new complexes are active catalysts with CuCl for cross-coupling reactions of R¹Br [R¹ = n-C₈H₁₇, BuCO(CH₂)₁₀, EtO₂CCH₂CH₂, CH₂:CHCH₂CH₂. Me₃SiCCCH₂CH₂] with R²MgCl (R² = Me₂CH, Bu, EtCHMe, Me₃C, n-C₁₄H₂₉) to give 8 corresponding R¹R² in 75-92% yield.

Recueil des Travaux Chimiques des Pays-Bas 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, Name: (4-Bromobut-1-yn-1-yl)trimethylsilane.

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

Dower, William V. published the artcileThermal conversion of 1,5,9-triynes. [2 + 2 + 2] Cycloadditions or [3.3]sigmatropic shifts?, Product Details of C7H13BrSi, the publication is Tetrahedron (1986), 42(6), 1873-81, database is CAplus.

The gas phase pyrolysis products [labeled and unlabeled naphthalene and [1,2:4,5]dicyclobutabenzene or hexaradialene] of RCC(CH₂)₂CC(CH₂)₂CCR [R = H, D (I)] and HCC(CH₂)₂¹³C¹³C(CH₂)₂CCH (II) or 1,5,9-cyclododecatriyne (III) and III–1,10–¹³C₂ (IV), examined at 400-600°/10^-4-40 tor with ∼1 ms-15 s contact times, show that the mechanism involves a series of [3.3] sigmatropic shifts; [2 + 2 + 3] cycloadditions of the alkyne units do not occur. The preparation of I, II, III, and IV are discussed.

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, Product Details of C7H13BrSi.

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

Lednicer, Daniel published the artcile4-Amino-4-arylcyclohexanones and their derivatives: a novel class of analgesics. 2. Modification of the carbonyl function, Quality Control of 18928-94-4, the publication is Journal of Medicinal Chemistry (1981), 24(4), 404-8, database is CAplus and MEDLINE.

The cyclohexanols I (R = H, alkyl, alkenyl, alkynyl, PhCH₂, PhCH₂CH₂, etc.; R¹ = H, Cl, Br, Me), prepared by the reduction of or addition of nucleophiles to the corresponding cyclohexanones, were separated into cis and trans isomers and tested for analgesic activity. The trans (OH and N) isomers were invariably more potent than the cis. I (R = PhCH₂CH₂) are among the most potent opioids reported to date; possibly the ring system may be providing an addnl. binding site for these compounds, and thus greatly enhance their affinity for the opioid receptor.

Journal of Medicinal Chemistry published new progress about 18928-94-4. 18928-94-4 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic cyclic hydrocarbon, name is (2-Bromoethyl)cyclopentane, and the molecular formula is C7H13Br, Quality Control of 18928-94-4.

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

Vereshchagin, A. N. published the artcileAnisotropy of polarizability and dipole moments of some 1,2-dibromoethane derivatives, Quality Control of 594-81-0, the publication is Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya (1973), 163-5, database is CAplus.

Kerr constants and dipole moments of BrRR1CCR2R3Br (I, R-R3 = H, Me, Ph) were reported. The trans conformers of such compounds had effective dipole moments that could not be described by the simple moment-additive scheme. The Me-substituted I in solution were mainly in transform whereas Ph shifted the conformational equilibriumsubstantially by destabilizing the trans location of the 2 Br atoms probably by gauche interaction of Ph and Br components. This interaction was ∼1.2 cal/mole.

Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya 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 C38H24F4O4P2, Quality Control of 594-81-0.

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

Cimrova, Vera published the artcileDonor-acceptor copolymers containing bithiophene and dithiophenylthienothiadiazole units with fast electrochromic response, Quality Control of 52431-30-8, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2019), 7(28), 8575-8584, database is CAplus.

New low-bandgap donor-acceptor (D-A) functional copolymers, CDTDBT and CEHTDBT, composed of a 3,3′-didodecyl-2,2′-bithiophene donor and 4,6-bis(3′-dodecylthiophene-2′-yl)thieno[3,4-c][1,2,5]thiadiazole (DT) or 4,6-bis(3′-(2-ethylhexyl)thiophene-2′-yl)thieno[3,4-c][1,2,5]thiadiazole (EHT) acceptor structural units, resp., were synthesized by Stille coupling of the corresponding comonomers. The influence of decyls or branched 2-ethylhexyls chains attached to the thiophenes of the 4,6-bis(3′-alkylthiophene-2′-yl)thieno[3,4-c][1,2,5]thiadiazole on the photophys., thermochromic, electrochem., and spectroelectrochem. properties are reported and discussed in comparison to a series of D-A copolymers with various donor units and the corresponding dithiophenylthienothiadiazole (DT or EHT) acceptor units. The new copolymers, CDTDBT and CEHTDBT, exhibit interesting electrochromic behaviors with fast response times, which reach full optical contrast in 0.3 s. These new copolymers have the potential to be used for optical switching.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices 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, Quality Control of 52431-30-8.

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

Kminek, Ivan published the artcileLow-band gap copolymers containing thienothiadiazole units: synthesis, optical, and electrochemical properties, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2010), 48(13), 2743-2756, database is CAplus.

Novel low-band gap alternating copolymers consisting of 9,9-bis(2-ethylhexyl)fluorene and 4,6-di(2-thienyl)thieno[3,4-c][1,2,5]thiadiazole and its 3,3”-dialkyl derivatives were synthesized by Suzuki copolymerization reaction, and their photophys. and electrochem. properties were studied. The copolymers possess small optical band gap 1.3-1.4 eV. The absorption covers the whole visible spectral region. The long-wavelength absorption maxima in thin films located at approx. 750-785 nm are significantly red shifted compared with those in solution, indicating strong intermol. interactions. The introduction of alkyl chains to the thiophene units increases the mol. weights of soluble fractions and solubility of the final copolymers, leading to the improved processability of thin films. Polymer solutions exhibited solvatochromism and thermochromism, which is strongly supported by the involvement of the alkyl chains. The copolymers exhibited ambipolar redox properties and reversible electrochromic behavior. The electronic properties are influenced only slightly by alkyl substituents.

Journal of Polymer Science, Part A: Polymer Chemistry 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