Tag: M.W=200-250

Cavazza, Claudia published the artcileSynthesis and Electrochemical Characterization of Halide, Isocyanide, and Alkynyl Synthons Containing the Encumbered Triangular Cluster Unit Pt₃(μ-P^tBu₂)₃, HPLC of Formula: 18512-55-5, the publication is Inorganic Chemistry (2009), 48(4), 1385-1397, database is CAplus and MEDLINE.

Useful synthons containing the tri-bridged triangular unit {Pt₃} = [Pt₃(μ-P^tBu₂)₃]⁺ were prepared starting from the known tricarbonyl derivative [{Pt₃}(CO)₃]Z, [(1⁺)Z, Z = CF₃SO₃^–]. This was easily converted into the monohalides {Pt₃}(CO)₂X [2, X = Cl; 3, X = Br; 4, X = iodo], by reaction with the appropriate halide salt. The coupling reaction between 2 and terminal alkynes in the presence of CuI afforded in good yields the σ-alkynyl derivatives {Pt₃}(CO)₂(CC-R) [6, R = SiMe₃; 7, R = CC-SiMe₃; 8, R = C₆H₅; 9, R = C₆H₄Br-4; 10, R = C₆H₄CCH-4; 11, R = 2-C₄H₂SCCH-5; 12, R = 9-C₁₄H₈CCH-10], while desilylation of 6 or 7 with TBAF/THF gave, resp., the derivatives 13 (R = H) and 14 (R = CCH). The stepwise elongation of the arylalkynyl chain was obtained by the Sonogashira coupling of 10 with an excess of 1,4-diiodobenzene, which produced 15 (R = C₆H₄-4-CC-C₆H₄-4-I), and by coupling the latter with an excess of 1,4-diethynylbenzene, which formed 16 (R = [C₆H₄CC-4]₃H). Branched synthons were obtained by substitution of the carbonyl ligands with functional isocyanides; the reaction of an excess of CN-C₆H₄-4-R (R = I, CCH) with {Pt₃}(CO)₂H, 5, or with complex (1⁺)Z afforded, resp., {Pt₃}(CN-C₆H₄-4-I)₂H, 17, or [{Pt₃}(CN-C₆H₄-4-R)₃]Z [(18⁺)Z, R = I; (19⁺)Z, R = CCH]. The crystal structures of complexes 2, 8, and 9 were established by x-ray diffraction studies. The electrochem. characterization of representative examples of the clusters prepared in this work shows that all clusters were characterized by the presence of two oxidations; an anal. of ligands’ effects on the redox processes is also included.

Inorganic Chemistry published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C18H10, HPLC of Formula: 18512-55-5.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Li, Shu-hong published the artcileSilicon-containing poly(p-arylene vinylene)s: Synthesis and photophysics, COA of Formula: C18H10, the publication is Chinese Journal of Polymer Science (2012), 30(4), 589-594, database is CAplus.

A series of new silicon-containing poly(p-arylene vinylene)s (PAVs) with anthracene units in the main chain were synthesized by hydrosilylation reaction. The introduction of organosilicon units improved the solubility of the polymers, and the π-π conjugation of polymeric chains was interrupted. These polymers behaved as blue-green light emitters with their fluorescence maximum at 447-499 nm and quantum yields in the range of 0.282-0.30 in solution

Chinese Journal of Polymer Science published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C18H10, COA of Formula: C18H10.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Kotlyarevskii, I. L. published the artcileOxidative polycondensation of diacetylene compounds, Application In Synthesis of 18512-55-5, the publication is Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya (1961), 1905-7, database is CAplus.

cf. CA 54, 24466i.-Products of dehydrogenation of diethylbenzenes (Balandin, et al., CA 54, 8676h) brominated in CCl₄ at -15° gave a tetrabromide (I), m. 156-7°. Dehydrobromination (Deluchat, CA 28, 3062¹) gave a low yield of p-diethynylbenzene (II) m. 95°. Hydrogenation of p-Ac₂C₆H₄ over Raney Ni at normal temperature and pressure gave 86.5% 1, 4-bis(α-hydroxyethyl)benzene, m. 78.4-80°, passed over Al₂O₃ at 330° in dioxane gave crude divinylbenzene which was directly brominated to I. II in dioxane was treated with a solution of Cu₂Cl₂ and NH₄Cl in aqueous HCl and the system was shaken and blown with O until gas uptake ceased; treatment of the complex with Et₂O-H₂O gave a red-orange oligomer with repeating links of p-CCC_εH₄CC which is insoluble and explodes above 120°. Similar oxidation of II in pyridine in the presence of Cu₂Cl₂ gave a yellow oligomer free of Cl and Cu (the reddish product contained some Cl but was free of Cu). Similar oxidation of 1,4-diethynyl-1,4-dihydroxycyclohexane gave a light-colored oligomer containing 70.75% C. Similarly were prepared insoluble oligomers from 9,10-diethynyl-9,10-dihydroxy-9,10-dihydroanthracene, 9,10-diethynyl-9,10-dihydroxy-9,10-dihydrophenanthrene, and 9,10-diethynylanthracene (the latter contained some Cl). The oligomers were generally insoluble in the usual solvents.

Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C18H10, Application In Synthesis of 18512-55-5.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Jesny, S. published the artcileElectrocatalytic resolution of guanine, adenine and cytosine along with uric acid on poly (4-amino-3-hydroxy naphthalene-1-sulfonic acid) modified glassy carbon electrode, Safety of 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, the publication is Journal of Electroanalytical Chemistry (2017), 153-161, database is CAplus.

A simple, easy to fabricate, selective and sensitive sensor for simultaneous determination of nucleic acid bases guanine, adenine and cytosine along with uric acid is being reported. Glassy C electrode with an electropolymerized layer of 4-amino-3-hydroxy naphthalene-1-sulfonic acid could resolve the oxidation peaks of uric acid, guanine, adenine and cytosine using 0.1M NaOH as supporting electrolyte. The electrocatalytic oxidation current is linear in the range from 10 μM-250 μM for uric acid, guanine and adenine and 80 μM-250 μM for cytosine with detection limit 9.31 μM, 0.93 μM, 6.20 μM and 9.20 μM resp. for simultaneous determination by square wave voltammetry. The diffusion coefficient of uric acid, guanine, adenine and cytosine in 0.1M NaOH was determined by chronoamperometry. The electrode processes are diffusion controlled, which eliminate the fouling effect produced by adsorption of these organic compounds on the electrode surface. The developed sensor has promising applications for real sample anal.

Journal of Electroanalytical Chemistry published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H9NO4S, Safety of 4-Amino-3-hydroxynaphthalene-1-sulfonic acid.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Lamm, Jan-Hendrik published the artcilePolyalkynylanthracenes – syntheses, structures and their behaviour towards UV irradiation, HPLC of Formula: 18512-55-5, the publication is Organic & Biomolecular Chemistry (2014), 12(37), 7355-7365, database is CAplus and MEDLINE.

A series of bis- and tris[(trimethylsilyl)ethynyl]anthracenes (1,5-, 1,8-, 9,10- and 1,8,10-) has been synthesized by multistep (cross coupling) reactions and the behavior of the SiMe₃-functionalised alkynylanthracene derivatives towards UV irradiation was qual. studied by NMR spectroscopy. In the case of 9,10-bis[(trimethylsilyl)ethynyl]anthracene we observed a photodimerization upon UV irradiation; the third example was reported for a sym. 9,10-difunctionalised anthracene derivative, besides those with small fluorine- and methyl-substituents. The anthracene dimerization is completely thermally reversible and the temperature dependence of the cycloelimination reaction was studied by ¹H VT-NMR experiments The (deprotected) 1,5- and 1,8-diethynylanthracenes were converted with (dimethylamino)trimethylstannane to obtain the corresponding SnMe₃-functionalised alkynes, potentially useful as highly conjugated building blocks in Stille cross coupling reactions. The new anthracene compounds were completely characterised by multinuclear NMR spectroscopy, (high resolution) mass spectrometry and – in most cases – by X-ray diffraction experiments

Organic & Biomolecular Chemistry published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C18H10, HPLC of Formula: 18512-55-5.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Sall, Mohamed Lamine published the artcileRemoval of Cr(VI) from aqueous solution using electrosynthesized 4-amino-3-hydroxynaphthalene-1-sulfonic acid doped polypyrrole as adsorbent, SDS of cas: 116-63-2, the publication is Environmental Science and Pollution Research (2017), 24(26), 21111-21127, database is CAplus and MEDLINE.

Polypyrrole (PPy) conducting films, doped with 4-amino-3-hydroxynaphthalene sulfonic acid (AHNSA), were electrosynthesized by anodic oxidation of pyrrole on Pt and steel electrodes in aqueous medium (0.01 M AHNSA +0.007 M NaOH), using cyclic voltammetry (CV), and their electrochem. properties were studied. Fourier-transform IR (FT-IR) spectroscopy confirmed the formation of AHNSA-PPy films. Their morphol. was characterized by SEM (SEM), and their optical properties, including UV-VIS absorption and fluorescence spectra, were also investigated. AHNSA-PPy films were used for the removal of chromium(VI) from aqueous solution, by means of the immersion method and the Cr(VI) electro-reduction method. The effect of various exptl. parameters, including the adsorbent (polymer) mass, pH, type of electrodes, and current intensity, on the adsorption of chromium by the polymer was performed and optimized. The adsorption and electro-reduction of (Cr VI) on the AHNSA-PPy film surface were found to be highly pH-dependent, and the kinetics of Cr(VI) adsorption and electro-reduction followed second-order kinetic curves. Apparent second-order rate constants were about three times higher for the Cr(VI) electro-reduction method than for the immersion method, indicating that the use of electro-reduction method significantly accelerated the chromium adsorption process on polymer. The maximum adsorption capacity of the AHNSA-PPy film for chromium was 224 mg g^-1. A 96% chromium removal from pure aqueous solution was reached within about 48 h by the immersion method, but only within about 6 h by the Cr(VI) electro-reduction method. Application of both methods to Cr(VI) fortified natural waters of Senegal led to chromium removal efficiency high values (93 to 96% according to the type of natural water).

Environmental Science and Pollution Research published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H9NO4S, SDS of cas: 116-63-2.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Yam, Chi Ming published the artcileFabrication of Self-Assembled Mono- and Multilayered Thin Films via Step-by-Step Deposition of Sn(NEt₂)₄ and Dialkyne Terminated Chromophores on Silica Based Surfaces, Recommanded Product: 9,10-Diethynylanthracene, the publication is Langmuir (2002), 18(22), 8481-8487, database is CAplus.

Acid-base hydrolytic chem. of surface anchored [Sn]-NEt₂ moieties with dialkyne terminated mols. has been used to construct close packed thin films of good structural quality on Si(100)/(Si/SiO₂) substrates. The surface coverage in these thin films was found to be 2-7 mols./100 Ų. An elaboration of this methodol. to a layer-by-layer deposition process using Sn(NEt₂)₄ and 1,9-decadiyne or p-diethynylbenzene led to thin film structures of up to five layers. The evolution of thin films in the step-by-step fabrication was monitored by contact angle goniometry, ellipsometry, XPS, FTIR-ATR, and UV-vis absorption spectroscopy. Topochem. polymerization on a thin film of p-bis(butadiynyl)benzene was achieved by exposure to UV-vis radiation, giving a blue film. Cobalt carbonyl could be easily adsorbed on these alkynyl thin films under room-temperature conditions.

Langmuir published new progress about 18512-55-5. 18512-55-5 belongs to naphthyridine, auxiliary class Alkynyl,Anthracene, name is 9,10-Diethynylanthracene, and the molecular formula is C3H7NO2, Recommanded Product: 9,10-Diethynylanthracene.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Wang, Qingxiang published the artcileA sensitive DNA biosensor based on a facile sulfamide coupling reaction for capture probe immobilization, Computed Properties of 116-63-2, the publication is Analytica Chimica Acta (2013), 158-164, database is CAplus and MEDLINE.

A novel DNA biosensor was fabricated through a facile sulfamide coupling reaction. First, the versatile sulfonic dye mol. of 1-amino-2-naphthol-4-sulfonate (AN-SO₃^–) was electrodeposited on the surface of a glassy carbon electrode (GCE) to form a steady and ordered AN-SO₃^– layer. Then the amino-terminated capture probe was covalently grafted to the surface of SO₃^–-AN deposited GCE through the sulfamide coupling reaction between the amino groups in the probe DNA and the sulfonic groups in the AN-SO₃^–. The step-by-step modification process was characterized by electrochem. and attenuated total reflectance Fourier transform IR (ATR-FTIR) spectroscopy. Using Ru(NH₃)₆³⁺ as probe, the probe d. and the hybridization efficiency of the biosensor were determined to be 3.18 × 10¹³ strands cm^-2 and 86.5%, resp. The hybridization performance of the biosensor was examined by differential pulse voltammetry using Co(phen)₃^3+/2+ (phen = 1,10-phenanthroline) as the indicator. The selectivity experiments showed that the biosensor presented distinguishable response after hybridization with the three-base mismatched, non-complementary and complementary sequences. Under the optimal conditions, the oxidation peak currents of Co(phen)₃^3+/2+ increased linearly with the logarithm values of the concentration of the complementary sequences in the range from 1.0 × 10^-13 M to 1.0 × 10^-8 M with a regression coefficient of 0.9961. The detection limit was estimated to be 7.2 × 10^-14 M based on 3σ.

Analytica Chimica Acta published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C17H14N2O2, Computed Properties of 116-63-2.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Yildiz, Resit published the artcileEvaluation of corrosion inhibition of mild steel in 0.1 M HCl by 4-amino-3-hydroxynaphthalene-1-sulfonic acid, HPLC of Formula: 116-63-2, the publication is Corrosion Science (2014), 215-221, database is CAplus.

The corrosion behavior of 4-amino-3-hydroxynaphthalene-1-sulfonic acid (4A3H1S) in 0.1 M HCl on mild steel (MS) was measured by electrochem. impedance spectroscopy (EIS), linear polarization resistance (LPR) and potentiodynamic measurements at various concentrations The surface morphol. of the MS was examined by SEM both in the absence of an inhibitor and in the presence of a 10 mM 4A3H1S-containing corrosive medium. The inhibition mechanism was determined by the potential of the zero charge (E_pzc) measurement at the solution-metal interface. The adsorption of 4A3H1S on the surface of MS obeyed the isotherm of Langmuir adsorption.

Corrosion Science published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H10CoF6P, HPLC of Formula: 116-63-2.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem

Li, Zhengyu published the artcileOne-Pot Synthesis of 3-Difluoromethyl Benzoxazole-2-thiones, HPLC of Formula: 116-63-2, the publication is Organic Letters (2018), 20(20), 6407-6410, database is CAplus and MEDLINE.

A one-pot strategy for the diversified synthesis of 3-difluoromethyl benzoxazole-2-thiones is reported. The reaction of 2-aminophenol, sodium chlorodifluoroacetate, and elemental sulfur in the presence of NaOt-Bu gives exclusively 3-difluoromethyl benzoxazole-2-thiones in good yield (up to 98%). The mechanism of this reaction presumably involves first cyclization of 2-aminophenols with thiocarbonyl fluoride, followed by N-difluoromethylation with difluorocarbene. The developed synthetic procedures are versatile, robust, and easily scalable for the synthesis of 3-difluoromethyl benzoxazole-2-thione derivatives, some of which have shown insecticidal activities.

Organic Letters published new progress about 116-63-2. 116-63-2 belongs to naphthyridine, auxiliary class Sulfonic acid,Amine,Naphthalene,Alcohol,Organic Pigment, name is 4-Amino-3-hydroxynaphthalene-1-sulfonic acid, and the molecular formula is C10H9NO4S, HPLC of Formula: 116-63-2.

Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem