Tag: M.W=300-350

Jackson, S. David published the artcileAdsorption of chiral 2,2′-substituted-1,1′-binaphthalenes onto silica-supported palladium and nickel, Formula: C22H18O2, the publication is Adsorption Science & Technology (2006), 24(3), 257-267, database is CAplus.

The nature of the adsorption of 2,2′-substituted-1,1′-binaphthalenes over supported palladium and nickel catalysts were studied. Adsorption occurs through the 2,2′-substituted functional groups. Where this is not possible, no adsorption of the binaphthyl is observed Adsorption of 2,2′-diamino-1,1′-binaphthalene occurred solely on the metal components of the catalysts. However, total coverage of the metal surface was not obtained, with only specific sites being available for adsorption. Adsorption of 2,2′-dihydroxy-1,1′-binaphthalene occurred on the metal components but also spilled over onto the support. Adsorption was detected for 2-hydroxy-2′-methoxy-1,1′-binaphthalene but no spill-over was observed, indicating that both hydroxy groups are involved in the spill-over process. Co-adsorption and sequential adsorption studies revealed that there are a variety of adsorption sites that favor different binaphthyls.

Adsorption Science & Technology published new progress about 2960-93-2. 2960-93-2 belongs to naphthyridine, auxiliary class Naphthalene,Ether,Other MOF ligands,Organic ligands for MOF materials, name is 2,2′-Dimethoxy-1,1′-binaphthalene, and the molecular formula is C22H18O2, Formula: C22H18O2.

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

Gilman, Henry published the artcileOxygen-containing heterocycles as liquid scintillator solutes, Recommanded Product: Spiro[fluorene-9,9′-xanthene], the publication is Journal of Organic Chemistry (1958), 361-2, database is CAplus.

cf. C.A. 52, 5424h. Derivatives of dibenzofuran (I), dibenzo-p-dioxin (II) and xanthene were screened as liquid scintillator solutes and the primary-solute relative pulse heights relative to 2,5-diphenyloxazole (arbitrary value 1.00) are tabulated. The biphenyl linkage in I presumably makes all its derivatives superior to corresponding II derivatives The results suggest that the introduction of MeO and dialkylamino groups increases the relative pulse height by shortening the lifetime of the excited state and providing a greater probability that fluorescence will occur before a radiationless transition (C.A. 52, 5382d). The values tabulated indicated that further work on II is promising only with 2-substituted derivatives Cu bronze (4 g.) and 4.0 g. 1-iododibenzo-p-dioxin heated 5 hrs. at 250° (oil bath), the cooled pulverized mixture extracted with hot C₆H₆ and the concentrated extract diluted with alc. yielded 22% 1,1′-bis(dibenzo-p-dioxin), m. 217-19°. Cu bronze (5 g.) and 4.0 g. 2-iododibenzo-p-dioxin heated 4 hrs. at 240-50°, the cooled pulverized mixture extracted with hot C₆H₆, the extract chromatographed on Al₂O₃, the eluate diluted with alc. and the product recrystallized (AcOH) yielded 22% 2,2′-bis(dibenso-p-dioxin), m. 227-30°. Nitrous fumes slowly bubbled 2.5 hrs. through 4.0 g. 2-acetamidodibenzo-p-dioxin in 130 ml. AcOH and 20 ml. Ac₂O at 10°, the yellow-green solution poured into 1 l. ice-H₂O, the air-dried solid stirred 8 hrs. in 200 ml. dry C₆H₆ and kept 8 hrs. at room temperature, warmed 1 hr. and the C₆C₆ evaporated, the concentrated solution chromatographed on Al₂O₃ and the fraction recrystallized (alc.) gave 16% 2-phenyldibenzo-p-dioxin, m. 108-10°, with characteristic 1,2,4-tri-, 1,2-di-, and monosubstitution bands in the infrared spectrum. Excess PhCH₂MgCl added in 15 min. with stirring and gentle refluxing to 5.76 g. 2-benzoyldibenzo-p-dioxin in 100 ml. Et₂O, the mixture refluxed 2 hrs., hydrolyzed with saturated aqueous NH₄Cl, the dried (Na₂SO₄) Et₂O layer evaporated and the residue crystallized (alc.-H₂O) 3 times yielded 60% 1-(2-dibenzo-p-dioxinyl)-1,2-diphenylethanol (III), m. 141-2°. III (3.5 g.) and 15 ml. Lucas reagent (cf. Crawford and Nelson, C.A. 40, 1484⁸) refluxed 2 hrs. in 45 ml. C₆H₆, the washed (dilute aqueous Na₂CO₃) C₆H₆ layer evaporated, the oily residue boiled with ligroine (b. 60-70°) and the solid product crystallized (alc.-H₂O) 3 times yielded 33% 2-(α-phenylstyryl)dibenzo-p-dioxin. The use of Lucas reagent renders isolation of III unnecessary since dehydration was effected conveniently using crude carbinol solutions in C₆H₆.

Journal of Organic Chemistry published new progress about 159-62-6. 159-62-6 belongs to naphthyridine, auxiliary class Other Aromatic Heterocyclic,Spiro, name is Spiro[fluorene-9,9′-xanthene], and the molecular formula is C25H16O, Recommanded Product: Spiro[fluorene-9,9′-xanthene].

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

Zhang, Huaiyuan published the artcileOxidation of BINOLs by Hypervalent Iodine Reagents: Facile Synthesis of Xanthenes and Lactones, Quality Control of 2960-93-2, the publication is Chemistry – A European Journal (2022), 28(21), e202200181, database is CAplus and MEDLINE.

Much attention was focused on developing the synthetic methods to prepare xanthene derivatives. Binaphthyl-based xanthene derivatives, e.g., I (R = H), were prepared through the oxidation of BINOLs promoted by the hypervalent iodine reagent iodosylbenzene (PhIO). Nine-membered lactones, e.g., II, were obtained through a similar oxidative reaction when iodoxybenzene (PhIO₂) was used. Addnl., one-pot reactions of BINOLs, PhIO and nucleophiles such as alcs. and amines were also investigated to provide alkoxylated products,e.g., I (R = Me). and amides, e.g, III. in good to excellent yields.

Chemistry – A European Journal published new progress about 2960-93-2. 2960-93-2 belongs to naphthyridine, auxiliary class Naphthalene,Ether,Other MOF ligands,Organic ligands for MOF materials, name is 2,2′-Dimethoxy-1,1′-binaphthalene, and the molecular formula is C10H14O, Quality Control of 2960-93-2.

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

Wu, Peng published the artcileChromatographic Resolution of α-Amino Acids by (R)-(3,3′-Halogen Substituted-1,1′-binaphthyl)-20-crown-6 Stationary Phase in HPLC, Formula: C22H18O2, the publication is Chinese Journal of Chemistry (2017), 35(7), 1037-1042, database is CAplus.

Three new chiral stationary phases (CSPs) for high-performance liquid chromatog. were prepared from R-(3,3-halogen substituted-1,1-binaphthyl)-20-crown-6 (halogen = Cl, Br and I ). The exptl. results showed that R-(3,3-dibromo-1,1-binaphthyl)-20-crown-6 (CSP-1) possesses more prominent enantioselectivity than the two other halogen-substituted crown ether derivatives All twenty-one α-amino acids have different degrees of separation on R-(3,3-dibromo-1,1-binaphthyl)-20-crown-6-based CSP-1 at room temperature The enantioselectivity of CSP-1 is also better than those of some com. R-(1,1-binaphthyl)-20-crown-6 derivatives Both the separation factors (α) and the resolution (R_s) are better than those of com. crown ether-based CSPs [CROWNPAK CR(+) from Daicel] under the same conditions for asparagine, threonine, proline, arginine, serine, histidine and valine, which cannot be separated by com. CR(+). This study proves the com. usefulness of the R-(3,3-dibromo-1,1-binaphthyl)-20-crown-6 chiral stationary phase.

Chinese Journal of Chemistry published new progress about 2960-93-2. 2960-93-2 belongs to naphthyridine, auxiliary class Naphthalene,Ether,Other MOF ligands,Organic ligands for MOF materials, name is 2,2′-Dimethoxy-1,1′-binaphthalene, and the molecular formula is C18H26ClN3O, Formula: C22H18O2.

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

Pinxterhuis, Erik B. published the artcileFast, Efficient and Low E-Factor One-Pot Palladium-Catalyzed Cross-Coupling of (Hetero)Arenes, SDS of cas: 2960-93-2, the publication is Angewandte Chemie, International Edition (2018), 57(30), 9452-9455, database is CAplus and MEDLINE.

The homocoupling of aryl halides and the heterocoupling of aryl halides with either aryl bromides or arenes bearing an ortho-lithiation directing group are presented. The use of a Pd catalyst, in combination with t-BuLi, allows for the rapid and efficient formation of a wide range of polyaromatic compounds in a one pot procedure bypassing the need for the sep. preformation of an organometallic coupling partner. These polyaromatic structures were obtained in high yields, in 10 min at room temperature, with minimal waste generation (E-factors as low as 1.5) and without the need for strict inert conditions, making this process highly efficient and practical in comparison to classical methods. As illustration, several key intermediates of widely used BINOL-derived structures are readily prepared including the highly desired precursor to the chiral TRIP phosphoric acid.

Angewandte Chemie, International Edition published new progress about 2960-93-2. 2960-93-2 belongs to naphthyridine, auxiliary class Naphthalene,Ether,Other MOF ligands,Organic ligands for MOF materials, name is 2,2′-Dimethoxy-1,1′-binaphthalene, and the molecular formula is C22H18O2, SDS of cas: 2960-93-2.

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

Hellinghausen, Garrett published the artcileImproving peak capacities over 100 in less than 60 seconds: operating above normal peak capacity limits with signal processing, Application In Synthesis of 2960-93-2, the publication is Analytical and Bioanalytical Chemistry (2020), 412(8), 1925-1932, database is CAplus and MEDLINE.

A primary focus in liquid chromatog. anal. of complex samples is high peak capacity separations Using advanced instrumentation and optimal small, high-efficiency columns, complex multicomponent mixtures can now be analyzed in relatively short times. Despite these advances, chromatog. peak overlap is still observed Recently, attention has shifted from improvements in chromatog. efficiency and selectivity to enhancing data processing after collection. Curve fitting methods can be used to trace underlying peaks, but do not directly enhance chromatog. resolution Methods based on the properties of derivatives and power transform were recently shown to enhance chromatog. peak resolution while maintaining critical peak information (peak areas and retention times). These protocols have been extensively investigated for their fundamental properties, advantages, and limitations, but they have not been evaluated with complex chromatograms. Herein, we evaluate the use of deconvolution via Fourier transform (FT), even-derivative peak sharpening, and power law with the fast separation (< 60 s) of a 101-component mixture using ultra-high-pressure liquid chromatog. High noise and peak overlap are present in this gradient separation, which is representative of fast chromatog. Chromatog. resolution enhancement is demonstrated and described. Further, accurate quantitation is maintained and shown with representative examples. Enhancements in peak capacity and peak-to-peak resolutions are discussed. Finally, the statistical theory of overlap is used for 101 peaks and predictions are made for the number of singlet, doublet, and multiplets analyte peaks. The effect of increasing peak capacity by FT even derivative sharpening and power laws leads to a decrease in the number of peak overlaps and an increase in total peak number

Analytical and Bioanalytical Chemistry published new progress about 2960-93-2. 2960-93-2 belongs to naphthyridine, auxiliary class Naphthalene,Ether,Other MOF ligands,Organic ligands for MOF materials, name is 2,2′-Dimethoxy-1,1′-binaphthalene, and the molecular formula is C22H18O2, Application In Synthesis of 2960-93-2.

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

Sun, Ping published the artcileEvaluation of aromatic-derivatized cyclofructans 6 and 7 as HPLC chiral selectors, Name: 2,2′-Dimethoxy-1,1′-binaphthalene, the publication is Analyst (Cambridge, United Kingdom) (2011), 136(4), 787-800, database is CAplus and MEDLINE.

The two best aromatic-functionalized cyclofructan chiral stationary phases, R-naphthylethyl-carbamate cyclofructan 6 (RN-CF6) and dimethylphenyl-carbamate cyclofructan 7 (DMP-CF7), were synthesized and evaluated by injecting various classes of chiral analytes. They provided enantioselectivity toward a broad range of compounds, including chiral acids, amines, metal complexes, and neutral compounds It is interesting that they exhibited complementary selectivities and the combination of two columns provided enantiomeric separations for 43% of the test analytes. These extensive chromatog. results provided useful information about method development of specific analytes, and also gave some insight as to the enantioseparation mechanism.

Analyst (Cambridge, United Kingdom) published new progress about 2960-93-2. 2960-93-2 belongs to naphthyridine, auxiliary class Naphthalene,Ether,Other MOF ligands,Organic ligands for MOF materials, name is 2,2′-Dimethoxy-1,1′-binaphthalene, and the molecular formula is C5H10N2OS, Name: 2,2′-Dimethoxy-1,1′-binaphthalene.

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

Chu, Zengze published the artcileSynthesis of Dendritic Oligo-Spiro(fluorene-9,9′-xanthene) Derivatives with Carbazole and Fluorene Pendants and their Thermal, Optical, and Electroluminescent Properties, SDS of cas: 159-62-6, the publication is Macromolecular Rapid Communications (2009), 30(20), 1745-1750, database is CAplus and MEDLINE.

Two novel spiro-configured ter(arylene-ethynylene) derivatives, TSF-Cz and TSF-F, were designed and synthesized using spiro(fluorene-9,9′-xanthene) (SFX) as building blocks, introducing a hole-transporting carbazole and a fluorene chromophore as the peripheral functional group into the backbone through an O atom. The 2 well-defined oligomers possess good solubility, film-forming quality, and high T_g‘s at 140 and 126°, resp. These oligomers exhibit blue photoluminescence (PL) emission both in solution and solid states. The double-layered devices fabricated using the 2 materials as the emitter show a sky-blue emission with a brightness and a current efficiency of 7,613 cd m^-2 and 1.11 cd A^-1 for TSF-Cz, and 1,507 cd m^-2 and 0.36 cd A^-1 for TSF-F, resp.

Macromolecular Rapid Communications published new progress about 159-62-6. 159-62-6 belongs to naphthyridine, auxiliary class Other Aromatic Heterocyclic,Spiro, name is Spiro[fluorene-9,9′-xanthene], and the molecular formula is C25H16O, SDS of cas: 159-62-6.

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

Chen, Qi published the artcileSpiro(fluorene-9,9′-xanthene)-Based Porous Organic Polymers: Preparation, Porosity, and Exceptional Hydrogen Uptake at Low Pressure, Name: Spiro[fluorene-9,9′-xanthene], the publication is Macromolecules (Washington, DC, United States) (2011), 44(20), 7987-7993, database is CAplus.

Preparation and sorption properties of spiro(fluorene-9,9′-xanthene)-based porous organic polymers (SPOPs) are reported. Using a same linker monomer, the micropore size and sp. surface area in SPOPs are tunable by variation of the structure of core building blocks. According to the obtained nitrogen physisorption isotherms, the Brunauer-Emmett-Teller sp. surface area for these polymers varies between 750 and 1020 m²/g. Copolymer SPOP-3 containing spiro(fluorene-9,9′-xanthene) and spirobifluorene with 1:1 ratio, prepared by Suzuki coupling polymerization, possesses 2.22 weight% hydrogen adsorption capacity at 1.0 bar and 77 K, which not only is the exceptional uptake capacity for hydrogen at low pressure among the best reported results for organic polymers but also can be competitive with other kinds of porous materials such as activated carbons and metal-organic frameworks.

Macromolecules (Washington, DC, United States) published new progress about 159-62-6. 159-62-6 belongs to naphthyridine, auxiliary class Other Aromatic Heterocyclic,Spiro, name is Spiro[fluorene-9,9′-xanthene], and the molecular formula is C25H16O, Name: Spiro[fluorene-9,9′-xanthene].

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

Feng, Li-Heng published the artcileHighly selective recognition of monosaccharide based on two-component system in aqueous solution, Computed Properties of 2960-93-2, the publication is Tetrahedron (2011), 67(18), 3175-3180, database is CAplus.

A highly selective switch for D-fructose was formed by water-soluble conjugated polymer (PP-S-BINOL) and tetraboronic acid-functionalized benzyl viologen (ToBV). The two-component system showed a high selectivity and sensitivity only for D-fructose in familiar D-monosaccharides. The high selectivity of the sensing system for D-fructose may be depended on stable pyranose ester form of D-fructose with ToBV. A desirable linear response of the sensing system to low concentrations of D-fructose (<10.0 mM) was observed with 0.9936 linear dependent coefficient at pH 7.4.

Tetrahedron published new progress about 2960-93-2. 2960-93-2 belongs to naphthyridine, auxiliary class Naphthalene,Ether,Other MOF ligands,Organic ligands for MOF materials, name is 2,2′-Dimethoxy-1,1′-binaphthalene, and the molecular formula is C22H18O2, Computed Properties of 2960-93-2.

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