Month: November 2022

Goswami, Garima published the artcileKinetics and mechanism of the oxidation of some diols by benzyltrimethylammonium tribromide, Safety of Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, the publication is Proceedings – Indian Academy of Sciences, Chemical Sciences (2001), 113(1), 43-54, database is CAplus.

The kinetics of oxidation of five vicinal and four non-vicinal diols, and two of their monoethers by benzyltrimethylammonium tribromide (BTMAB) have been studied in 3:7 (volume/volume) acetic acid-water mixture The vicinal diols yield the carbonyl compounds arising out of the glycol bond fission while the other diols give the hydroxycarbonyl compounds The reaction is first-order with respect to BTMAB. Michaelis-Menten type kinetics is observed with respect to diol. Addition of benzyltrimethylammonium chloride does not affect the rate. Tribromide ion is postulated to be the reactive oxidizing species. Oxidation of [1,1,2,2-²H₄] ethanediol shows the absence of a kinetic isotope effect. The reaction exhibits substantial solvent isotope effect. A mechanism involving a glycol-bond fission has been proposed for the oxidation of the vicinal diols. The other diols are oxidized by a hydride ion transfer to the oxidant, as are the monohydric alcs.

Proceedings – Indian Academy of Sciences, Chemical Sciences published new progress about 111865-47-5. 111865-47-5 belongs to bromides-buliding-blocks, auxiliary class Benzenes, name is Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, and the molecular formula is C10H16Br3N, Safety of Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide.

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

Goel, Shruti published the artcileKinetics and mechanism of oxidation of some α-hydroxy acids by benzyltrimethylammonium tribromide, Product Details of C10H16Br3N, the publication is Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry (1996), 35B(11), 1180-1184, database is CAplus.

The oxidation of glycolic acid, lactic acid, 2-hydroxy-2-methylpropanoic acid, mandelic acid and nine monosubstituted mandelic acids by benzyltrimethylammonium tribromide (BTMAB) in 1:1 (volume/volume) acetic acid-water leads to the formation of the corresponding carbonyl compounds The reaction is first order with respect to BTMAB. Michaelis-Menten type kinetics have been observed with respect to the hydroxy acid. The rates of decomposition of the complexes show an excellent correlation with Hammett’s σ values with low neg. reaction constants The oxidation of α-deuteriomandelic acid indicates the absence of a kinetic isotope effect. The reaction shows a substantial solvent isotope effect (k(H₂O)/k(D₂O) = 3.57 at 313 K). With an increase in the proportion of acetic acid in the solvent mixture of acetic acid and water, the rate decreases. Addition of benzyltrimethylammonium ion has no effect on the reaction rate. The reaction fails to induce the polymerization of acrylonitrile. A suitable mechanism has been proposed.

Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry published new progress about 111865-47-5. 111865-47-5 belongs to bromides-buliding-blocks, auxiliary class Benzenes, name is Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, and the molecular formula is C10H16Br3N, Product Details of C10H16Br3N.

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

Garg, Dimple published the artcileKinetics and mechanism of the oxidation of some α-amino acids by benzyltrimethylammonium tribromide, HPLC of Formula: 111865-47-5, the publication is Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry (2005), 44B(9), 1909-1914, database is CAplus.

The oxidation of nine α-amino acids by benzyltrimethylammonium tribromide (BTMAB), in aqueous acetic acid, gives the corresponding aldehydes. The reaction is first order with respect to BTMAB. Michaelis-Menten type kinetics are observed with respect to the amino acids. The thermodn. parameters for the complex formation and the activation parameters for the decomposition of complex were determined An addition of benzyltrimethylammonium ion does not affect the rate. The oxidation of perdeuterioglycine shows the absence of a kinetic isotope effect (k_H/k_D = 1.05 at 313 K). The effect of solvent composition indicates that the reaction rate increases with an increase in the polarity of the medium. The reaction is susceptible to both polar and steric effects of the substituents. Suitable mechanism was proposed.

Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry published new progress about 111865-47-5. 111865-47-5 belongs to bromides-buliding-blocks, auxiliary class Benzenes, name is Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, and the molecular formula is C10H16Br3N, HPLC of Formula: 111865-47-5.

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

Crofts, Peter C. published the artcileThe preparation and the determination of apparent dissociation constants of some substituted aliphatic phosphonic acids, SDS of cas: 66197-72-6, the publication is Journal of the American Chemical Society (1953), 5738-40, database is CAplus.

cf. C.A. 47, 12220f. An examination was made of the effect produced on the dissociation constant of MePO₃H₂ (I) by the substitution of 1, 2, or 3 Cl atoms, 1 Br, or 1 iodine atom, or an HO group in the Me group of I, the simplest phosphonic acid. The acids produce on titration the expected curves with 2 inflection points, but because of the very considerable acid strength of the 2nd H of Cl₃CPO₃H₂ (II) the 1st inflection point cannot be satisfactorily determined by chem. indicators. The substitution of halogens or of a HO group increases the acid strength of I. For the acids studied, pK’_a1 and pK’_a2 are: ClCH₂PO₃H₂ (III), 1.40, 6.30; Cl₂CHPO₃H₂ (IV), 1.14, 5.61; II, 1.63, 4.81; BrCH₂PO₃H₂ (V), 1.14, 6.52; ICH₂PO₃H₂ (VI), 1.30, 6.72; HOCH₂PO₃H₂ (VII), 1.91, 7.15; I, 2.38, 7.74. For most of the following compounds, the methods presented were developed after unsuccessful attempts to prepare the compounds by other methods. Paraformaldehyde (10 g.) and 71 g. PCl₃ heated 11.5 hrs. at 240-50° in a sealed tube yielded 67% ClCH₂POCl₂ (VIII), b_16.5 93°. VIII stirred slowly into excess water and the solution evaporated to dryness in vacuo yielded III, m. 88° after softening at 85°. Hydrolysis of Cl₂CHPOCl₂ (Kinnear and Perren, C.A. 47, 5878h) by the method for III yielded IV, m. 116-19°. P(OEt)₃ (IX) and CCl₄ (Kosolapoff, C.A. 41, 5851i) yielded the di-Et ester of II which was refluxed 6 hrs. with 100 cc. HCl and 50 cc. water, and the resulting solution treated with C and evaporated to give II, m. 85-7°; dried over P₂O₅ at 0.05 mm., it m. 163.5°, after softening at 161°. IX (126 g.) and 162 g. CH₂Br₂ autoclaved 4 hrs. at 172° yielded the di-Et ester of V, which, refluxed 9 hrs. with 48% HBr, gave V, m. 62°, after softening at 54°. IX and CH₂I₂ yielded the di-Et ester (X) of VI, b_0.01 61°, 23.6 g. of which, refluxed 1 day with 100 cc. HCl and 50 cc. water, gave VI, m. 89°, after softening at 86°. X (25 g.) and 40.3 g. AgF slowly heated in a distillation apparatus 5 hrs. at about 30 mm. yielded 2.3 g. distillate, yielding on redistillation the di-Et ester of I, b₂₁ 91-2°. The method of Page (C.A. 6, 2064) gave VII, m. 99-100°.

Journal of the American Chemical Society 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 C5H12BrO3P, SDS of cas: 66197-72-6.

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

Zhang, Liming published the artcileStereocontrolled Synthesis of Kelsoene by the Homo-Favorskii Rearrangement, Computed Properties of 69361-41-7, the publication is Organic Letters (2002), 4(21), 3755-3758, database is CAplus and MEDLINE.

(±)-Kelsoene (I) has been synthesized from 2,5-dihydroanisole in 16 steps in 12.5% overall yield. The key step involves a base-catalyzed reaction of γ-keto tosylate II, which effects a homo-Favorskii rearrangement to III (X¹ = H,H; X² = O) as well as the corresponding intramol. S_N2 product IV from the enolate of II. Ketone IV can efficiently be isomerized to cyclobutanone III (X¹ = O; X² = H,H) having the kelsoene carbon skeleton upon acid treatment.

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 C3H5BN2O2, Computed Properties of 69361-41-7.

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

Speck, J. Matthaeus published the artcileFerrocenes Bridged by Ethylenediamino Thiophene: Varying Charge Transfer Properties in a Series of 3,4-Di-N-substituted 2,5-Diferrocenyl Thiophenes, Safety of 2,5-Dibromo-3,4-dinitrothiophene, the publication is Organometallics (2015), 34(15), 3788-3798, database is CAplus.

A series of 3,4-di-N-substituted 2,5-diferrocenyl thiophenes is reported with the aim to explore the electronic interaction between the organometallic termini over their bridging unit. The syntheses of thiophenes 1–4 were implemented on the basis of 2,5-diferrocenyl-3,4-dinitrothiophene (1), which is accessible within a Pd-promoted Suzuki-Miyaura C,C cross-coupling reaction. Reduction of the nitro functionalities and a subsequent methylation or condensation reaction gives 2,5-diferrocenyl-3,4-bis(N,N-dimethylamino)-thiophene (2) or 5,7-diferrocenylthieno[3,4-b]pyrazine (3). Finally, 5,7-diferrocenyl-1,4-dimethyl-1,2,3,4-tetrahydrothieno[3,4-b]pyrazine (4) could be synthesized through conversion of 3 in a two-step reduction/methylation reaction. The spectroscopic characterization of 1–4 was complemented by the investigation of their structural properties in the solid state. The latter disclose no significant influence of the electronically different N substituents on the thiophene bond distances and angles in the solid state. UV-vis solvatochromic studies on thiophenes 1 and 3 in 40 different solvents offer a moderate pos. solvatochromic shift of the MLCT absorption of 1; however, for pyrazine 3 a slight neg. solvatochromism of the appropriate absorption band was observed The electrochem. studies on thiophenes 1–4 reveal an increasing thermodn. stability of the mixed-valent species (K_C) in the order 1 < 2 ≈ 3 < 4. In situ UV-vis-NIR spectroelectrochem. examinations verify these observations. Thus, the NIR absorptions of the corresponding mixed-valent species become more intense and less solvatochromic as the electron-donating effect and the extent of the electronic π system of the bridging unit increase. Hence, the electronic coupling between the iron-based redox centers over the thiophene-based core increases in the order 1 < 2 ≈ 3 < 4.

Organometallics 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 C11H21BF4N2O2, Safety of 2,5-Dibromo-3,4-dinitrothiophene.

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

Madar, D. J. published the artcileSynthesis of N-arylated oxazolidinones via a palladium catalyzed cross coupling reaction. Application to the synthesis of the antibacterial agent Dup-721, Safety of Methyl 2-(5-bromo-2-nitrophenyl)acetate, the publication is Tetrahedron Letters (2001), 42(22), 3681-3684, database is CAplus.

A method for the intermol. coupling of aryl bromides and oxazolidinones is described. Application to intermediates useful for the preparation of a known class of antibacterial agent and the synthesis of the known antibacterial oxazolidinone Dup-721 are described.

Tetrahedron Letters published new progress about 189748-25-2. 189748-25-2 belongs to bromides-buliding-blocks, auxiliary class Bromide,Nitro Compound,Benzene,Ester, name is Methyl 2-(5-bromo-2-nitrophenyl)acetate, and the molecular formula is C9H8BrNO4, Safety of Methyl 2-(5-bromo-2-nitrophenyl)acetate.

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

Zhang, Yan published the artcileThree novel donor-acceptor type electrochromic polymers containing 2,3-bis(5-methylfuran-2-yl)thieno[3,4-b]pyrazine acceptor and different thiophene donors: Low-band-gap, neutral green-colored, fast-switching materials, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Journal of Electroanalytical Chemistry (2018), 7-19, database is CAplus.

Three novel donor-accept type electrochromic polymers with very low band gap, PMFTTP, PMFBTTP and PMFMOTTP, were prepared via electrochem. polymerization, employing 2,3-bis(5-methylfuran-2-yl)thieno[3,4-b]pyrazine as the acceptor units and thiophene, butylthiophen and methoxythiophene as the donor units, resp. All the polymers were comparatively studied by cyclic voltammetry (CV), scanning electron micrographs (SEM), UV-visible-NIR spectroscopy and colorimetry. PMFTTP and PMFBTTP showed obvious color change from green color to brown in the oxidation process, while PMFMOTTP exhibited color change from brick red to dark gray. And the three polymers possessed very low optical band gaps in the following order: PMFTTP (1.23 eV) > PMFBTTP (0.88 eV) > PMFMOTTP (0.74 eV), which demonstrated the different election-donating ability of thiophene or its derivatives The electrochromic kinetic studies manifested that the polymers presented satisfactory optical contrasts (ΔT%) in the near IR region (NIR), which were 35%, 67% and 60% for PMFTTP, PMFBTTP and PMFMOTTP, resp. Also, the polymers also displayed short switching times (<1 s at any wavelengths), high coloration efficiencies (around ∼200 cm²/C) and outstanding robust stabilities, suggesting the probability of being the promising candidates for the electrochromic devices. In summary, the above pos. results, especially the neutral green color and the very low band gap, had important theor. significance for the application and development of electrochromic polymers.

Journal of Electroanalytical 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 C20H19FN2O2, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Ju, Xiuping published the artcileSynthesis and electrochemical capacitive performance of thieno[3,4-b]pyrazine-based Donor-Acceptor type copolymers used as supercapacitor electrode material, Synthetic Route of 52431-30-8, the publication is Electrochimica Acta (2017), 36-48, database is CAplus.

Two novel donor-acceptor-donor type monomers were synthesized by using thieno[3,4-b]pyrazine (TPZ) as the acceptor units (A) and 3-methylthiophene or 3-methoxythiophene as the donor units (D). The as-prepared D-A-D monomers were named as MOTP and MTP, resp. These two monomers could be facilely polymerized on the glass carbon electrode (GCE) via a potentiostatic method, and the resultant D-A-D alternative conjugated polymers were referred as PMOTP and PMTP. The obtained conjugated polymers were routinely characterized by FT-IR, SEM and TGA at first. Then, as supercapacitor electrode materials, they were further investigated in detail by cyclic voltammetry (CV), constant galvanostatic charge-discharge (GCD) and electrochem. impedance spectroscopy (EIS) methods The GCD results showed that the polymer-modified GCEs had high specific capacitances of 678.2 and 319.1 F/g, for PMOTP and PMTP, resp., at a c.d. of 1 A/g. Excellent switching stabilities were also observed for both polymer-modified GCEs, with the high retention rates of 77.3% and 53.4% for PMOTP and PMTP, resp., after 1000 times of charge-discharge cycling at a c.d. of 10 A/g. Notably, the maximum energy densities of 22.4 Wh/kg and 7.94 Wh/kg were attained at the power d. of 0.55 kW/kg for the sym. supercapacitor based on PMOTP and PMTP, resp. The excellent performances of these two D-A-D type conjugated polymers make them to be the promising electrode materials for energy-storage and conversion applications.

Electrochimica Acta 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, Synthetic Route of 52431-30-8.

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

Kakinami, Takaaki published the artcileSelective bromination of aromatic amines by use of tetrabutylammonium tribromide and benzyltrimethylammonium tribromide, Recommanded Product: Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, the publication is Ube Kogyo Koto Senmon Gakko Kenkyu Hokoku (1989), 37-45, database is CAplus.

The title reactions in CH₂Cl₂-MeOH containing powd. CaCO₃ at room temperature gave, selectively, the mono-, di-, or tribromo-substituted aromatic amines in good yields.

Ube Kogyo Koto Senmon Gakko Kenkyu Hokoku published new progress about 111865-47-5. 111865-47-5 belongs to bromides-buliding-blocks, auxiliary class Benzenes, name is Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, and the molecular formula is C10H16Br3N, Recommanded Product: Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide.

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