Month: November 2022

Perez de Vargas-Sansalvador, I. M. published the artcilePhosphorescent sensing of carbon dioxide based on secondary inner-filter quenching, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Analytica Chimica Acta (2009), 655(1-2), 66-74, database is CAplus and MEDLINE.

A study of different strategies to prepare phosphorescence-based sensors for gaseous CO₂ determination was performed. It includes the characterization of different configurations tested, a discussion of the results obtained and possibilities for the future. The optical sensor for gaseous CO₂ is based on changes in the phosphorescence intensity of the platinum octaethylporphyrin (PtOEP) complex trapped both on oxygen-insensitive poly(vinylidene chloride-co-vinyl chloride) (PVCD) membranes and PVCD microparticles, due to the displacement of the α-naphtholphthalein acid-base equilibrium with CO₂ concentration A secondary inner-filter mechanism was tested for the sensor and a full range linearized calibration was obtained by plotting (I₁₀₀-I₀)/(I-I ₀) vs. the inverse of the CO₂ concentration, where I₀ and I₁₀₀ are the detected luminescence intensities from a membrane exposed to 100% nitrogen and 100% CO₂, resp., and I at a defined CO₂ concentration The different configurations tested included the use of membranes containing luminophore and pH-sensitive dye placed on two opposite sides of a transparent support to prevent the observed degradation of the PtOEP complex in the presence of the tetraoctylammonium hydroxide (TOAOH) phase transfer agent, which produced better results regarding stability and sensitivity. The CO₂ gas sensor based on PtOEP homogeneous membranes presented better properties in terms of response time and sensitivity than that based on PtOEP microparticles. With a detection limit of 0.02%, the response time (10-90% maximum signal) is 9 s and the recovery time (90-10%) is 115 s. The lifetime of the membranes for CO₂ sensing preserved in a 94% RH atm. and dark conditions is longer than at least 4 mo.

Analytica Chimica Acta published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Aguayo-Lopez, M. L. published the artcileOptical sensor for carbon dioxide gas determination, characterization and improvements, Quality Control of 596-01-0, the publication is Talanta (2014), 196-201, database is CAplus and MEDLINE.

A study of different alternatives to improve the stability and lifetime of sensors for the determination of gaseous CO₂ was performed. It includes the characterization of different sensing membranes, a discussion of the results obtained and possibilities for the future. The solid sensor membrane for gaseous CO₂ based on changes in the luminescence of a luminophore immobilized on O₂-insensitive film, concurrent with the displacement of a pH indicator, has some drawbacks, such as the loss of efficiency over time and the need to maintain the sensor in special atm. conditions. As a solution to these drawbacks, two alternatives were tested, the 1st alternative was replacing the newly proposed tetraoctyl ammonium hydroxide (TOAOH ) phase transfer agent with other basic agents that did not undergo a Hoffman degradation reaction, and the 2nd alternative was the use of hydrophilic polymers that could retain water needed for CO₂ sensing more efficiently. The different membranes tested indicated that the use of tetra-Me ammonium (TMAOH) instead of TOAOH as the phase transfer agent produced better results regarding stability and sensitivity. Replacing the membrane polymer with hydrophilic polymers improved the sensing characteristics in terms of response time and stability over hydrophobic polymers. With a detection limit of 0.006%, the response time is 19 s and the recovery time is 100 s. The lifetime of the sensing membranes, which do not need to be held in any special atm. other than darkness, is longer than at least 300 days for membranes with TMAOH in hydrophilic polymer and 515 days for membranes with TMAOH in Et cellulose.

Talanta published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Quality Control of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Zhang, Ling published the artcileDeconstructive Reorganization: De Novo Synthesis of Hydroxylated Benzofuran, Application of 5-(6-Hydroxybenzofuran-2-yl)benzene-1,3-diol, the publication is Angewandte Chemie, International Edition (2020), 59(12), 4670-4677, database is CAplus and MEDLINE.

An unprecedented deconstructive reorganization strategy for the de novo synthesis of hydroxylated benzofurans I [R = H, OH; R¹ = t-Bu, 3-thienyl, Ph, etc.; R² = H, OH, Me, OMe, 4-MeOC₆H₄S; R³ = H, OH, Ph, etc.] from kojic acid- or maltol-derived alkynes was reported. In this reaction, both the benzene and furan rings were simultaneously constructed, whereas the pyrone moiety of the kojic acid or maltol was deconstructed and then reorganized into the benzene ring as a six-carbon component. Through this strategy, at least one free hydroxyl group was introduced into the benzene ring in a substitution-pattern tunable fashion without protection-deprotection and redox adjustment. With this method, a large number of hydroxylated benzofuran derivatives with different substitution-patterns were prepared efficiently. This methodol. was shown as the key step in a collective total synthesis of hydroxylated benzofuran-containing natural products.

Angewandte Chemie, International Edition published new progress about 56317-21-6. 56317-21-6 belongs to benzofurans, auxiliary class Metabolic Enzyme,PDE,Natural product, name is 5-(6-Hydroxybenzofuran-2-yl)benzene-1,3-diol, and the molecular formula is C34H33ClN6O7, Application of 5-(6-Hydroxybenzofuran-2-yl)benzene-1,3-diol.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Fernandez-Sanchez, J. F. published the artcileOptical CO₂-sensing layers for clinical application based on pH-sensitive indicators incorporated into nanoscopic metal-oxide supports, Synthetic Route of 596-01-0, the publication is Sensors and Actuators, B: Chemical (2007), 128(1), 145-153, database is CAplus.

We describe CO₂-selective films designed for clin. application based on the co-incorporation of different phenol dyes, α-naphtholphthalein (NAF), naphthol blue black (NBB) and Calmagite (CMG), with a phase-transfer agent, tetraoctylammonium hydroxide (TONOH), into metal-oxide nanoporous matrixes. The metal-oxide coatings consist of aluminum (AlOOH), silicon (SiO₂) and zirconium (ZrO₂) oxides. The chem. reaction principle and preparation of these new sensing layers are described in detail. We have investigated the effect of the type and concentration of the pH-indicator and TONOH together with that of the composition and morphol. characteristics of the nanostructured material. The influence of external parameters such as flow-rate, humidity and interfering gases (NO, CO, NO₂ and SO₂) were also looked into. The sensing films responded to CO₂ concentrations in the gas phase between 0.25% and 40% CO₂ (volume/volume) for NAF-TONOH, 4.1% and 30% CO₂ for NBB-TONOH and 0.6% and 40% CO₂ for CMG-TONOH, with detection limits of 0.25%, 4.1% and 0.6% CO₂ (volume/volume) for NAF-TONOH, NBB-TONOH and CMG-TONOH, resp. The nanoporous membranes provided higher dispersion and accessibility of the dye, and thus a quick response time, lower probability of aggregation, the possibility of sterilization by gamma radiation, insulation from reactive chems. and higher ambient stability.

Sensors and Actuators, B: Chemical published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Synthetic Route of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

He, Xingcun published the artcileFlow injection analysis of platinum metals. VI. Iridium(IV)-potassium periodate-α-naphtholphthalein system, SDS of cas: 596-01-0, the publication is Fenxi Huaxue (1990), 18(3), 237-9, database is CAplus.

A flow-injection spectrophotometric method for determination of trace Ir(IV) was developed based on the catalytic effect of Ir(IV) on the oxidation of α-naphtholphthalein with KIO₄. The detection limit is 0.020 μg Ir/mL and the anal. rate is 61 sample/h. The method is simple, fast, and sensitive.

Fenxi Huaxue published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, SDS of cas: 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

He, Xingcun published the artcileCatalytic determination of osmium by using flow-injection analysis, Safety of 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Huaxue Tongbao (1988), 41-2, database is CAplus.

Os(VIII) was determined by flow-injection spectrophotometry (monitored at 640 nm) based on the catalytic effect of Os(VIII) on the decolorization reaction of α-naphtholphthalein and KIO₄ in borate buffer solution at pH 9.20-9.80. The catalytic reaction is a zero-order reaction. The calibration curve is linear for 0.010-0.12 μg Os/mL. The detection limit is 0.010 μg/mL. The method is accurate, simple, and with an anal. rate of 75/h. Os was determined in ore concentrates and slags with satisfactory results.

Huaxue Tongbao published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Safety of 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Mongin, Florence published the artcileDeprotonation of furans using lithium magnesates, Quality Control of 69626-75-1, the publication is Tetrahedron Letters (2005), 46(46), 7989-7992, database is CAplus.

Furan was deprotonated on treatment with 1/3 equiv of Bu₃MgLi in THF at rt. The lithium arylmagnesate formed was either trapped with electrophiles or involved in a palladium-catalyzed cross-coupling reaction with 2-bromopyridine. The highly coordinated magnesate Bu₄MgLi₂ (1/3 equiv) proved to be a better deprotonating agent than Bu₃MgLi; the monitoring of the reaction using NMR spectroscopy showed that the deprotonation of furan at rt required 2 h whereas the subsequent electrophilic trapping was instantaneous. The method was extended to benzofuran, allowing its functionalization at C2 in high yields. The deprotonation of 2-methylfuran and lithium furfurylalkoxide at C5 turned out to be difficult, requiring either long reaction times or higher temperatures

Tetrahedron Letters published new progress about 69626-75-1. 69626-75-1 belongs to benzofurans, auxiliary class Iodide,Benzofuran, name is 2-Iodobenzofuran, and the molecular formula is C8H5IO, Quality Control of 69626-75-1.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Fiandanese, Vito published the artcileA straightforward synthesis of benzofuran- and indole-substituted 1,2,3-triazoles via click chemistry, Computed Properties of 69626-75-1, the publication is Synthesis (2009), 3853-3859, database is CAplus.

A convenient synthesis of benzofuran- and indole-substituted 1,2,3-triazoles, e.g., I (R = H, I; X = O, NH), has been devised starting from easily available 2-silylalkynyl-substituted benzofuran and indole derivatives

Synthesis published new progress about 69626-75-1. 69626-75-1 belongs to benzofurans, auxiliary class Iodide,Benzofuran, name is 2-Iodobenzofuran, and the molecular formula is C8H5IO, Computed Properties of 69626-75-1.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Fiandanese, Vito published the artcileA straightforward synthesis of indole and benzofuran derivatives, Recommanded Product: 2-Iodobenzofuran, the publication is Tetrahedron (2008), 64(1), 53-60, database is CAplus.

A methodol. for the synthesis of indole and benzofuran derivatives has been devised. The starting materials, ortho-substituted aryl diynes, have been easily converted into unsaturated bis-indolyl and bis-benzofuran derivatives and into 2-ethynylindole and 2-ethynylbenzofuran. Both these products have been further elaborated into more complex unsaturated indole-benzofuran and bis-benzofuran derivatives

Tetrahedron published new progress about 69626-75-1. 69626-75-1 belongs to benzofurans, auxiliary class Iodide,Benzofuran, name is 2-Iodobenzofuran, and the molecular formula is C8H5IO, Recommanded Product: 2-Iodobenzofuran.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Fiandanese, Vito published the artcileAn easy access to unsymmetrically substituted 4,4′-bis-1,2,3-triazoles, Application In Synthesis of 69626-75-1, the publication is Tetrahedron (2009), 65(51), 10573-10580, database is CAplus.

A convenient synthesis of 4-alkynyl-1,2,3-triazoles and novel unsym. substituted 4,4′-bi-1,2,3-triazole derivatives has been devised starting from easily available 1-trimethylsilyl-1,3-butadiyne. The starting compound was reacted with several azides, leading to 4-(silylalkynyl)-1,2,3-triazoles, which were easily transformed into 4-arylalkynyl-1,2,3-triazoles by a Pd catalyzed coupling reaction with aryl iodides, or into novel 4,4′-bis-1,2,3-triazole derivatives by a subsequent cyclization reaction with azides.

Tetrahedron published new progress about 69626-75-1. 69626-75-1 belongs to benzofurans, auxiliary class Iodide,Benzofuran, name is 2-Iodobenzofuran, and the molecular formula is C8H5IO, Application In Synthesis of 69626-75-1.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem