Tag: M.W=200-250

Otsuki, Akira published the artcileObservation of aggregate structure of green and blue fluorescent powders suspended in heptane by interactive force measurement, Safety of Dodecylamineacetate, the publication is International Journal of the Society of Materials Engineering for Resources (2006), 13(2), 86-91, database is CAplus.

Three kinds of fluorescent powders were separated by means of organic liquid-liquid extraction for the recycling purpose. The effect of surfactant concentration on the separation of the fluorescent powders was observed In this study, the effect was analyzed by observing aggregate structure of the green and blue fluorescent powders using an exptl. apparatus, which measured the interactive force between two surfaces of glass hemisphere and flat plate under elec. field. The maximum distance between two surfaces is 20 ¦Ìm. The size of aggregates and adsorption state of green and blue fluorescent powders in heptane containing a certain amount of surfactant was measured. This method would be very useful for measuring the size of aggregate and the adsorption state of ultra fine particles dispersed in solution

International Journal of the Society of Materials Engineering for Resources published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, Safety of Dodecylamineacetate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Shamsipur, Mojtaba published the artcileAn efficient and selective fluorescent optode membrane based on 7-[(5-chloro-8-hydroxy-7-quinolinyl)methyl]-5,6,7,8,9,10-hexahydro-2H-1,13,4,7,10-benzodioxatriazacyclopentadecine-3,11(4H,12H)-dione as a novel fluoroionophore for determination of cobalt(II) ions, Formula: C10H10O6, the publication is Analytica Chimica Acta (2008), 630(1), 57-66, database is CAplus and MEDLINE.

A novel fluorescence chem. sensor for the highly sensitive and selective determination of Co²⁺ ions in aqueous solutions is prepared The cobalt sensing system was prepared by incorporating 7-[(5-chloro-8-hydroxy-7-quinolinyl)methyl]-5,6,7,8,9,10-hexahydro-2H-1,13,4,7,10-benzodioxatriazacyclopentadecine-3,11(4H,12H)-dione (L) as a neutral cobalt-selective fluoroionophore in the plasticized PVC membrane containing sodium tetraphenylborate as a liphophilic anionic additive. The response of the sensor is based on the strong selective fluorescence quenching of L by Co²⁺ ions. At a pH 5.0, the proposed sensor displays a calibration curve over a wide concentration range of 5.0 ¡Á 10^-7 to 2.0 ¡Á 10^-2 M with a relatively fast response time of <5 min. In addition to high stability and reproducibility, the sensor shows a unique selectivity towards Co²⁺ ion with respect to common coexisting cations. The proposed fluorescence optode was successfully applied to the determination of cobalt content of vitamin B12 ampul, cobalt cake, cobalt alloy and tap water samples.

Analytica Chimica Acta published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C6H17NO3Si, Formula: C10H10O6.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Satge, Jacques published the artcileInsertion reaction of germanium fluoride (GeF2) into a variety of ¦Ò type bonds, Application In Synthesis of 312-40-3, the publication is Comptes Rendus des Seances de l’Academie des Sciences, Serie C: Sciences Chimiques (1974), 278(21), 1309-12, database is CAplus.

The in-sertion of F2Ge into RX gave RGeXF2 (R = Et, MeOCH2; X = Cl, Br, iodo). Phenylchlorosilanes, Ph3SiCl, Ph2SiCl2, and Ph-SiCl3 inserted F2Ge to give Ph3SiGeF2Cl, Ph2Si(GeF2Cl)2, andPhSi(GeF2Cl)3, resp. A 95:5% mixture of the diastereomers of 2-chloro-5-methyl-2-phenyl-l-oxa-2-germacyclopentane inserted di-fluorogermylene stereospecifically to give a 95:5% mixture of the diastereomers of oxadigermacyclohexane I. Butadiene added methoxyfluorogermylene to give 1-fluoro-1-methoxy-2,3-di-methylgermacyclopent-3-ene (II).

Comptes Rendus des Seances de l’Academie des Sciences, Serie C: Sciences Chimiques published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Application In Synthesis of 312-40-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Lafferty, Walter J. published the artcileFar-infrared spectra of solid methyl halides, Recommanded Product: Difluorodiphenylsilane, the publication is Journal of Chemical Physics (1962), 83-6, database is CAplus.

The infrared spectra of solid MeCl, MeBr, MeI, CD₃Cl, CD₃Br, and CD₃I were measured at 130-30 cm.^-1 at 78¡ãK. Two sharp bands were found in the chloride and the bromide, and 3 in the iodide. These absorptions arise from lattice vibrational modes. The isotopic shifts exclude libration about the symmetry axis as a possible assignment for any of the bands; however, definite assignments to B-axis librations or translational modes cannot be made with confidence.

Journal of Chemical Physics published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Recommanded Product: Difluorodiphenylsilane.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Rapson, Wm. Sage published the artcileSynthesis of substances related to the sterols. VII, Recommanded Product: 2-(3-(Benzyloxy)phenyl)acetic acid, the publication is Journal of the Chemical Society (1935), 1533-43, database is CAplus.

Et 1-methyl-¦¤²-cyclopentene-1-carboxylate (I), b₁₃ 70-1¡ã, results from the HO ester and P₂O₆ in C₆H₆; the acid b₁₄ 110¡ã. Reduction of the Et ester gives 70% of 1-methyl-¦¤²-cyclopentenyl-1-carbinol (II), b₇₆₀ 162-5¡ã (p-nitrobenzoate, m. 67¡ã); PCl₅ in petr. ether gives the chloride, b₁₈ 40-56¡ã, which does not condense with AcCHNaCO₂Et in EtOH or C₆H₆. Dehydration of II with KHSO₄ gives a dihydrotoluene(?), b. 112-13¡ã. Electrolytic reduction of 35 g. of m-MeOC₆H₄CHO (4 amps., c. d., 0.025 amp./sq. cm.) for 3 hrs. gives 20 g. m-MeOC₆H₄CH₂OH (III) and 9 g. of 3,3′-dimethoxyhydrobenzoin ¦Á,¦Á’-di-Me ether, m. 112-13¡ã. III was converted through the chloride and nitrile to Et m-methoxyphenylacetate, which was reduced with Na and EtOH to ¦Â-m-methoxyphenylethyl alc., b₁₂ 135-7¡ã; the chloride, b₁₄ 128-30¡ã, reacts sluggishly with AcCHNaCO₂Et; Et ¦Â-m-methoxyphenylethylacetoacetate b₂ 180¡ã; hydrolysis gives ¦Ã-m-methoxyphenylpropyl Me ketone, b₁₉ 168¡ã (semicarbazone, m. 109¡ã); condensation with I did not give a pure ¦Â-diketone. The K salt of Et trans-cyclopentane-1-carboxylate-2-cyanoacetate and PhCH₂Ch₂Br give Et ¦Á-cyano-¦Á-(trans-2-carbethoxycyclopentyl)-¦Ã-phenylbutyrate, b₁ 195-200¡ã; hydrolysis with concentrated HCl (boiling 30 hrs.) gives ¦Á-cyano-¦Á-(trans-2-carboxycyclopentyl)-¦Ã-phenylbutyric acid, m. 210¡ã (decomposition); boiling with H₂SO₄ and AcOH gives ¦Á-(trans-2-carboxycyclopentyl)-¦Ã-phenylbutyric acid, m. 160-1¡ã; the trans-anhydride, m. 112¡ã, on heating at 250¡ã for 15 min., gives the cis-anhydride, which did not crystallize; the cis-acid m. 133¡ã. The trans-acid with H₂SO₄ gives 1-keto-2-(trans – 2′ – carboxycyclopentyl) – 1,2,3,4 – tetrahydronaphthalene, m. 164-5¡ã; heating with Ac₂O and AcONa and decomposition of the anhydride gives the cis-isomer, m. 155-6¡ã. The Me ester of the trans-acid m. 45¡ã; this did not react with BrCH₂CO₂Et and Zn. Both acids react with SOCl₂ in CHCl₃ to yield the trans- and cis- forms of 1-hydroxy – 2 – (2′ – carboxycyclopentyl) – 3,4 – dihydroxynaphthalene lactone, m. 162¡ã and 66¡ã, resp. The transform, monoclinic needles elongated along a, with the faces {021}, {100} developed; the dimensions of the unit cell are a = 8.2, b = 23.4, c = 13.6, ¦Â = 68¡ã; with a density of about 1.315, the number of mols. in the cell is 8; the cis-form crystallizes in triclinic plates, a = 7.27, b = 16.75; d. (001) = 11.0, ¦Ã = 75¡ã; d. 1.267, number of mols. in the unit cell, 4. Catalytic reduction of the trans-lactone yields 2-(2′-trans-carboxycyclopentyl)-1,2,3,4-tetrahydronaphthalene, m. 107¡ã. Et cyclopentan-2-one-1-carboxylate in PCl₅ in light petroleum gives Et 2-chloro-¦¤¹-cyclopentene-1-carboxylate, b₁₂ 95-8¡ã, and a small quantity of the acid, m. 115-16¡ã; this ester did not condense with AcCHNaCO₂Et or CHNa(CO₂Et)₂. m-HOC₆H₄CHO and PhCH₂Cl with Na give m-benzyloxybenzaldehyde, b₂₀ 215-18¡ã, m. 54¡ã; hippuric acid and Ac₂O give m-methoxybenzylidenephenylisoxazolone, yellow, m. 129¡ã; hydrolysis gives m-benzyloxyphenylpyruvic acid, m. 145¡ã but it decomposes on keeping; alk. H₂O₂ gives m-benzyloxyphenylacetic acid (IV), m. 126¡ã. Since debenzylation could not be avoided in further work methoxylated intermediates were used. The dry Na salt of IV, 6,3-O₂N-(MeO)C₆H₃CHO (V) and Ac₂O, heated on the water bath for 24 hrs., give 2-nitro-5-methoxy-¦Á-(m-benzyloxyphenyl)cinnamic acid, pale yellow, m. 148¡ã; 2-NH₂ derivative, m. 137¡ã. m-MeOC₆H₄CH₂CO₂Na, V and Ac₂O give 2-nitro-5-methoxy-¦Á-(m-methoxyphenyl)cinnamic acid, yellow, m. 148¡ã; 2-NH₂ derivative, m. 185¡ã; the diazo reaction gives 63% of a mixture of 44% 2,7-dimethoxyphenanthrene-9-carboxylic acid, pale yellow, m. 265¡ã, and 56% of the 2,5-isomer, pale yellow, m. 191¡ã. Decarboxylation gives 2,7-dimethoxyphenanthrene and the 2,5-isomer, m. 117¡ã (picrate, orange-red, m. 154-6¡ã). 2,5-Dihydroxyphenanthrene, m. 180¡ã; di-Ac derivative, m. 144¡ã. In the preparation of ¦Â-2-hydroxy-1-naphthylethyl Me ketone a by-product is 2-methyl-5,6-(1,2-naphtho)-¦Ã-pyran, b₁₆ 190¡ã, m. 44-5¡ã. The K derivative of Et cyclopentanonecarboxylate and octyl bromide, boiled 7 hrs. in C₆H₄Me₂, give Et 1-octylcyclopentan-2-one-1-carboxylate, b₁ 157-65¡ã (85% yield) (semicarbazone, m. 117¡ã); hydrolysis with Ba(OH)₂ gives ¦Á-octyladipic acid, m. 74¡ã, and 2-octylcyclopentanone, b₁₁ 135-8¡ã (semicarbazone, m. 183¡ã); reduction of the ketone yields 2-octylcyclopentanol, b₂₃ 161¡ã, b₈ 140¡ã; bromide, b₈ 135-40¡ã. Octyl-¦¤¹-cyclopentene and MeO₂CCH₂CH₂COCl with SnCl₂ or AlCl₃ give 2-(¦Â-carbomethoxypropionyl)-1-octyl-¦¤¹-cyclopentene, b₁ 173-7¡ã, n_D¹⁵ 1.4818. Work of R. Hirt on cyclopentanone-2-¦Â-propionic acid is described. Refluxing the acid with AcCl gives the enolic lactone, b₁₇ 116-7¡ã; cyclopentanol-2-¦Â-propionic acid lactone, b₁₈ 138-9¡ã. PhCH₂CH₂CH₂Ac and 85% H₂SO₄ at 0¡ã give 74% of 1-methyl-3,4-dihydronaphthalene, b₁₄ 107-8¡ã.

Journal of the Chemical Society published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C15H14O3, Recommanded Product: 2-(3-(Benzyloxy)phenyl)acetic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Otero, Elver published the artcileSynthesis and leishmanicidal activity of cinnamic acid esters: structure-activity relationship, Computed Properties of 16909-09-4, the publication is Medicinal Chemistry Research (2014), 23(3), 1378-1386, database is CAplus.

Several cinnamic acid esters were obtained via Fischer esterification of cinnamic acids derivatives with aliphatic alcs. Structures of the products were elucidated by spectroscopic anal. The synthesized compounds were evaluated for antileishmanial activity against L. (V) panamensis amastigotes and cytotoxic activity was evaluated against mammalian U-937 cells. The compounds 11, 15-17, and 23, were active against Leishmania parasite and although toxic for mammalian cells, they still are potential candidates for antileishmanial drug development. A SAR anal. indicates that first, while smaller alkyl chains lead to higher selectivity indexes (10, 11 vs. 12-17); second, the degree of oxygenation is essential for activity, primarily in positions 3 and 4 (17 vs. 18-20 and 22); and third, hydroxyl groups increase both activity and cytotoxicity (14 vs. 23). On the other hand, the presence of a double bond in the side chain is crucial for cytotoxicity and leishmanicidal activity (12 vs. 21). However, further studies are required to optimize the structure of the promising mols. and to validate the in vitro activity against Leishmania demonstrated here with in vivo studies.

Medicinal Chemistry Research published new progress about 16909-09-4. 16909-09-4 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ether, name is (E)-3-(2,4-Dimethoxyphenyl)acrylic acid, and the molecular formula is C11H12O4, Computed Properties of 16909-09-4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Brunschwig, Christel published the artcileVolatile composition and sensory properties of Vanilla ¡Átahitensis bring new insights for vanilla quality control, Synthetic Route of 31719-76-3, the publication is Journal of the Science of Food and Agriculture (2016), 96(3), 848-858, database is CAplus and MEDLINE.

BACKGROUND : Vanilla ¡Átahitensis produced in French Polynesia has a unique flavor among vanilla species. However, data on volatiles and sensory properties remain limited. In this study, the volatile composition and sensory properties of V. ¡Átahitensis from three Polynesian cultivars and two origins (French Polynesia/Papua New Guinea) were determined by gas chromatog.-mass spectrometry and quant. descriptive anal., resp., and compared to Vanilla planifolia. RESULTS : Vanilla species, origins and cultivars were differentiated by their volatile and sensory profiles using principal component anal. The V. ¡Átahitensis flavor from French Polynesia was characterized by a well-balanced sensory profile, having strong anise and caramel notes due to high levels of anisyl compounds V. ¡Átahitensis from Papua New Guinea was distinct from that of French Polynesia, having strong spicy, fruity, brown rum notes due to p-vinylguaiacol, p-cresol and esters. Vanilla planifolia showed stronger phenolic, woody, smoky notes due to guaiacol, creosol and phenol, which were found to be biomarkers of the species. Vanilla sensory properties were linked by partial least squares regression to key volatile compounds like guaiacol or creosol, which are indicators of lower quality. CONCLUSION : This study brings new insights to vanilla quality control, with a focus on key volatile compounds, irresp. of origin. ? 2015 Society of Chem. Industry.

Journal of the Science of Food and Agriculture published new progress about 31719-76-3. 31719-76-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 4-(Phenoxymethyl)benzoic acid, and the molecular formula is C14H12O3, Synthetic Route of 31719-76-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Du, Lufan published the artcileOrganic crystal-based THz source for complex refractive index measurements of window materials using single-shot THz spectroscopy, COA of Formula: C14H14N2O2, the publication is Applied Physics A: Materials Science & Processing (2021), 127(11), 846, database is CAplus.

We employed N-benzyl-2-methyl-4-nitroaniline (BNA) crystals bonded on substrates of different thermal conductivity to generate THz radiation by pumping with 800 nm laser pulses. Crystals bonded on sapphire substrate provided four times more THz yield than glass substrate. A pyrodetector and a single-shot electro-optic (EO) diagnostic were employed for measuring the energy and temporal characterization of the THz pulse. Systematic studies were carried out for the selection of a suitable EO crystal, which allowed accurate determination of the emitted THz spectrum from both substrates. Subsequently, the THz source and single-shot electro-optic detection scheme were employed to measure the complex refractive index of window materials in the THz range.

Applied Physics A: Materials Science & Processing published new progress about 201157-13-3. 201157-13-3 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is N-Benzyl-2-methyl-4-nitroaniline, and the molecular formula is C14H14N2O2, COA of Formula: C14H14N2O2.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Bardin, V. V. published the artcileReactions of trimethylsilylpentafluorobenzene and triethylgermylpentafluorobenzene with nucleophilic reagents, Name: Trimethyl(perfluorophenyl)silane, the publication is Journal of Fluorine Chemistry (1992), 59(2), 165-77, database is CAplus.

The reactions of trialkylsilyl- and (trialkylgermyl)pentafluorobenzenes with O-, N, S- and C-nucleophiles, and with LiAlH₄ are reported. Depending on the nature of the nucleophilic reagent, its attacked is oriented towards a heteroatom (RO^–, RS^–), the C-4 atom of the pentafluorophenyl ring (BuLi, LiAlH₄, piperidyllithium) or at both electrophilic centers (piperidine, RS^–).

Journal of Fluorine Chemistry published new progress about 1206-46-8. 1206-46-8 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Trimethyl(perfluorophenyl)silane, and the molecular formula is C9H9F5Si, Name: Trimethyl(perfluorophenyl)silane.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Bellini, Clement published the artcileSequential Barium-Catalysed N-H/H-Si Dehydrogenative Cross-Couplings: Cyclodisilazanes versus Linear Oligosilazanes, Application In Synthesis of 140-28-3, the publication is Chemistry – A European Journal (2016), 22(44), 15733-15743, database is CAplus and MEDLINE.

Starting from Ph₃SiH, the barium precatalyst Ba[CH(SiMe₃)₂]₂¡¤(THF)₃ was used to produce the disilazane Ph₃SiN(Bn)SiPh₂NHBn (4) by sequential N-H/H-Si dehydrogenative couplings with BnNH₂ and Ph₂SiH₂. Substrate scope was extended to other amines and hydrosilanes. This smooth protocol gives quant. yields and full chemoselectivity. Compound 4 and the intermediates Ph₃SiNHBn and Ph₃SiN(Bn)SiHPh₂ were structurally characterized. Further attempts at chain extension by dehydrocoupling of Ph₂SiH₂ with 4 instead resulted in cyclization of this compound, forming the cyclodisilazane c-(Ph₂Si-NBn)₂ (5) which was crystallog. authenticated. The ring-closure mechanism leading to 5 upon release of C₆H₆ was determined by complementary exptl. and theor. (DFT) investigations. Ba[CH(SiMe₃)₂]₂¡¤(THF)₃ and 4 react to afford the reactive Ba{N(Bn)SiPh₂N(Bn)SiPh₃}₂, which was characterized in situ by NMR spectroscopy. Next, in a stepwise process, intramol. nucleophilic attack of the metal-bound amide on the terminal silicon atom generates a five-coordinate silicate. It is followed by turnover-limiting ¦Â-C₆H₅ transfer to barium; this releases 5 and forms a transient [Ba]-Ph species, which undergoes aminolysis to regenerate [Ba]-N(Bn)SiPh₂N(Bn)SiPh₃. DFT computations reveal that the irreversible production of 5 through such a stepwise ring-closure mechanism is much more kinetically facile (¦¤G^¡Ù=26.2 kcal mol^-1) than an alternative ¦Ò-metathesis pathway (¦¤G^¡Ù=48.2 kcal mol^-1).

Chemistry – A European Journal published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, Application In Synthesis of 140-28-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia