Tag: M.W=100-150

Yu, Mo-han published the artcileSynthesis, crystal structure and catalytic property of a preyssler-type polyoxometalate modified by Mn(II) complexes, Computed Properties of 177-10-6, the publication is Wuji Huaxue Xuebao (2014), 30(6), 1221-1228, database is CAplus.

A new Preyssler-type polyoxometalate modified by Mn(II)-H₂biim/H₂O fragments, namely {[Mn(H₂biim)₂(H₂O)₂]₂[Mn(H₂biim)₃]₅Cl}[H(NaP₅W₃₀O₁₁₀)]·20H₂O (1) (H₂biim = 2,2′-biimidazole) has been hydrothermally synthesized, and characterized by single-crystal x-ray diffraction, elemental anal., TGA and electrochem. anal. Its catalytic activity for synthesis of cyclohexanone ethylene ketal has been investigated. Compound 1 contains a [NaP₅W₃₀O₁₁₀]^14- polyoxo anion, and seven isolated Mn(II)-H₂biim/H₂O complex units. A 3D framework is constructed through N-HO/OW and N-HCl hydrogen bonds between H₂biim mols. and polyoxo-anion or water mols., and Cl^–, and π-π interactions between the imidazole rings of biimidazole ligands. Compound 1 is a new environmentally friendly catalyst and has good recyclability for the protection of carbonyl compound

Wuji Huaxue Xuebao published new progress about 177-10-6. 177-10-6 belongs to dioxole, auxiliary class Dioxolane,Spiro, name is 1,4-Dioxaspiro[4.5]decane, and the molecular formula is C18H28N2O7, Computed Properties of 177-10-6.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Wang, Wei published the artcileSelf-assembly synthesis of a high-content sulfonic acid group functionalized ordered mesoporous polymer-based solid as a stable and highly active acid catalyst, Recommanded Product: 1,4-Dioxaspiro[4.5]decane, the publication is Journal of Materials Chemistry (2012), 22(31), 15874-15886, database is CAplus.

A stable and highly active ordered mesoporous polymer-based acid catalyst has been prepared via a ethylene oxide-propylene oxide triblock copolymer surfactant templating of a formaldehyde-3-mercaptopropyltrimethoxysilane-phenol-tetraethoxysilane copolymer and oxidation of the HS to SO₃H. The composition and nanostructure are characterized by XRD, NMR, XPS, TEM, nitrogen sorption, elemental and chem. anal. The sulfonic acid groups have been anchored within the well-arranged channels of the polymer-based matrix. Even with a high SO₃H group loading (up to about 27.4 wt%) on the mesoporous polymer-based material, the ordered mesostructure and high surface area (∼400 m² g^-1) can be retained and the functional moieties are highly chem. accessible. With the large number of acid sites (0.93-2.38 H⁺ mmol g^-1 determined by acid-base titration) and the hydrophobic character, the mesoporous polymer-based solid exhibits catalytic performance in acid-catalyzed reactions such as condensation and acetalization, not only high activity (per site yield of bisphenol A is over 45 in the condensation of phenol and acetone) but also excellent stability. Loss in acidic loading and activity is negligible even after the catalyst is reused 20 times in the acetalization of butanediol and aldehyde. The stability is most likely attributed to the hydrophobic nature of the mesoporous polymer-based solids, which favors the diffusion of water and thereby inhibits the poisoning of acidic sites caused by water generating in the reaction. Moreover, with large mesopores, the diffusion of reactants and products can be promoted and hence the catalytic activity can be further increased.

Journal of Materials Chemistry published new progress about 177-10-6. 177-10-6 belongs to dioxole, auxiliary class Dioxolane,Spiro, name is 1,4-Dioxaspiro[4.5]decane, and the molecular formula is C3H5F3O, Recommanded Product: 1,4-Dioxaspiro[4.5]decane.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Chopade, Shubham P. published the artcileIon-exchange resin-catalyzed ketalization of acetone with 1,4- and 1,2-diols: use of molecular sieve in reactive distillation, Recommanded Product: 2,2,4-Trimethyl-1,3-dioxolane, the publication is Reactive & Functional Polymers (1999), 42(3), 201-212, database is CAplus.

Ketalization of acetone with 1,4- and 1,2-diols was carried out in the presence of cation exchange resin catalysts to obtain corresponding cyclic ketals viz. dioxepins, dioxepanes and dioxolanes. The reaction is equilibrium controlled and low conversions were achieved in batch mode. Mol. sieves in semi-batch reactive distillation mode were used to remove the H₂O from the reaction mixture This resulted in high conversion of the limiting diol. The batch kinetics was explained by a pseudohomogeneous model. The effects of different configurations as well as various parameters were studied in detail to arrive at optimum conditions. An engineering solution was arrived at to make the process industrially feasible.

Reactive & Functional Polymers published new progress about 1193-11-9. 1193-11-9 belongs to dioxole, auxiliary class Dioxolanes, name is 2,2,4-Trimethyl-1,3-dioxolane, and the molecular formula is C6H12O2, Recommanded Product: 2,2,4-Trimethyl-1,3-dioxolane.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Daly, James T. published the artcileClosing the loop in the FR community (pulling the same rope instead of pushing it), Recommanded Product: 2,2,4-Trimethyl-1,3-dioxolane, the publication is Proceedings of the Annual Conference on Recent Advances in Flame Retardancy of Polymeric Materials (2013), 1-12, database is CAplus.

This paper will address the needs of the com. flame retardant production community, compounders, and our relationships with the FR ingredient manufacturers and the academic FR community. Use of a barrier material with a non-FR-FPUF resulted in the most toxic smoke. The dioxin and furan data indicates that there is not an increase in emission for chlorine containing FR-FPUF.

Proceedings of the Annual Conference on Recent Advances in Flame Retardancy of Polymeric Materials published new progress about 1193-11-9. 1193-11-9 belongs to dioxole, auxiliary class Dioxolanes, name is 2,2,4-Trimethyl-1,3-dioxolane, and the molecular formula is C6H12O2, Recommanded Product: 2,2,4-Trimethyl-1,3-dioxolane.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Jia, Wei published the artcileMethod for synthesis of cyclohexanone-ethylene glycol ketal, Application of 1,4-Dioxaspiro[4.5]decane, the publication is Guangdong Huagong (2012), 39(2), 78, 3, database is CAplus.

The paper introduced the use of anhydrous AlCl₃ as catalyst in cyclohexane, with water under the action of with cyclohexanone and ethylene glycol to get cyclohexanone-ethylene glycol ketal, and the specific technol. conditions were discussed.

Guangdong Huagong published new progress about 177-10-6. 177-10-6 belongs to dioxole, auxiliary class Dioxolane,Spiro, name is 1,4-Dioxaspiro[4.5]decane, and the molecular formula is C8H14O2, Application of 1,4-Dioxaspiro[4.5]decane.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Kankaanpera, Alpo published the artcileStereochemistry of alkyl-1,3-dioxolanes and the kinetics of their hydrolysis, Recommanded Product: 2,2,4-Trimethyl-1,3-dioxolane, the publication is Turun Yliopiston Julkaisuja, Sarja A: Physico-Mathematica-Biologica (1966), 68 pp., database is CAplus.

Twenty-three methyl substituted 1,3-dioxolanes (disregarding optical isomers) and 23 other substituted 1,3-dioxolanes were prepared for a kinetic study of their hydrolysis. The structures of 25 isomeric derivatives were deduced from kinetic data and, in some cases, the structures of the reagents used in the synthesis. The equilibrium constants of the interconversion of isomers indicate that the 1,3-dioxolane ring is non planar. The exptl. data can be accounted for if the ring has the shape of the half chair of cyclopentane, and one of the hetero atoms is located on the axis of symmetry. The kinetic data reveal that 1,3-dioxolane and its alkyl derivatives are hydrolyzed by the same mechanism as acyclic acetals. The reactions exhibit a number of special features not observed in previous studies of acetal hydrolysis. Structural factors affecting the rates are: polar effects of substituents which influence the strengths of the bonds broken in the rate determining stage, the eclipsing strain resulting from the interaction of substituents at positions 4 and 5 when the critical complex of the hydrolysis is approached, and steric effects due to the bending of substituents at position 2 toward the 1,3-dioxolane ring.

Turun Yliopiston Julkaisuja, Sarja A: Physico-Mathematica-Biologica published new progress about 1193-11-9. 1193-11-9 belongs to dioxole, auxiliary class Dioxolanes, name is 2,2,4-Trimethyl-1,3-dioxolane, and the molecular formula is C6H12O2, Recommanded Product: 2,2,4-Trimethyl-1,3-dioxolane.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Krzymien, M. E. published the artcileGC-MS analysis of organic vapors emitted from polyurethane foam insulation, Quality Control of 1193-11-9, the publication is International Journal of Environmental Analytical Chemistry (1989), 36(4), 193-207, database is CAplus.

The vapors emitted by rigid polyurethane foam at 40 and 80° in dry and in humid (90% relative humidity) air were trapped with a Tenax TA sampling tube and, after thermal desorption, analyzed by high resolution gas chromatog.-mass spectrometry. The chromatograms demonstrate that the qual. composition of the effluent is basically independent of both temperature and humidity of the foam. Over 70 compounds were identified as polyurethane foam off-gases. Among them the most numerous are hydrocarbons. The most abundant is the blowing agent, CFCl₃. The headspace concentration of the majority of them is <10 mg/m³, there are, however, several compounds with concentration >100 mg/m³.

International Journal of Environmental Analytical Chemistry published new progress about 1193-11-9. 1193-11-9 belongs to dioxole, auxiliary class Dioxolanes, name is 2,2,4-Trimethyl-1,3-dioxolane, and the molecular formula is C6H12O2, Quality Control of 1193-11-9.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Liang, Xuezheng published the artcileSynthesis of novel solid acidic ionic liquid polymer and its catalytic activities, Application of 1,4-Dioxaspiro[4.5]decane, the publication is Kinetics and Catalysis (2013), 54(6), 724-729, database is CAplus.

The novel solid acidic ionic liquid polymer was synthesized through the copolymerization of acidic ionic liquid oligomers and resorcinol-formaldehyde (RF resin). The catalytic activities were studied through the acetalization. The PIL was efficient for the reactions with the average yield over 99.0%. The procedure was quite simple with just one-step to complete both the reactions. The high hydrophobic BET surface, high catalytic activities and high stability gave the PIL great potential for green chem. processes.

Kinetics and Catalysis published new progress about 177-10-6. 177-10-6 belongs to dioxole, auxiliary class Dioxolane,Spiro, name is 1,4-Dioxaspiro[4.5]decane, and the molecular formula is C8H14O2, Application of 1,4-Dioxaspiro[4.5]decane.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Salomaa, Pentti published the artcileThe kinetics of the uncatalyzed and acid-catalyzed hydrolysis of 1,3-dioxol-4-one and its derivatives. III. Experiments in moderately concentrated acids and in deuterated solvents, Application of 2,2,4-Trimethyl-1,3-dioxolane, the publication is Acta Chemica Scandinavica (1966), 20(5), 1263-72, database is CAplus.

cf. CA 63, 12995c. The rates of hydrolysis of 1,3-dioxolones (I) containing 0, 1, or 2 Me substituents on the C atom between the 2 ether O atoms, in moderately concentrated HCl and in mixtures of light and heavy water, indicate that the I which have no substituents on the C-2 hydrolyze by the normal type of acid-catalyzed ester hydrolysis. The 2-Me-substituted I are not hydrolyzed by either a normal type or an A-1 type ester hydrolysis. It is suggested that a H₂O mol. is involved in the formation of the critical complex. This idea is supported by experiments in light and heavy water and in their mixtures The gross D solvent-isotope effect (kD/k_H = 1.68) is comparable to that found in the normal type of ester hydrolysis, being lower than in A-1 reactions of acetals and acetal-esters. The behavior in H₂O-D₂O mixtures of different compositions conforms to an equation which is based on 3 exchangeable H atoms in the critical complex. A discussion of the hydrolysis mechanism of 2-Me-substituted I is presented.

Acta Chemica Scandinavica published new progress about 1193-11-9. 1193-11-9 belongs to dioxole, auxiliary class Dioxolanes, name is 2,2,4-Trimethyl-1,3-dioxolane, and the molecular formula is C6H12O2, Application of 2,2,4-Trimethyl-1,3-dioxolane.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem

Schurig, V. published the artcileEnantiomer analysis by complexation gas chromatography. Scope, merits and limitations, COA of Formula: C6H12O2, the publication is Journal of Chromatography (1988), 441(1), 135-53, database is CAplus.

The application of complexation gas chromatog. in comtemporary enantiomer anal. was investigated. Enantiomers were separated without derivatization on Chiral metal stationary phases, such as manganese(II), cobalt(II), and nickel(II) bis[3-(heptafluorobutanoyl)-(1R)-camphorate], coated on high-resolution glass and fused-silica open-tubular columns. Enantiomeric excesses (ee) up to 99.9% can be precisely determined by complexation gas chromatog. Employing the gas chromatog.-mass spectrometry (single ion monitoring) technique, the determination of ee and absolute configurations of solutes, present in complex mixtures, can be performed at the low picogram level. For the first time, pertinent sources of error in the gas chromatog. determination of ee were identified and novel exptl. verifications thereof are presented. Interconversion profiles due to inversion of configuration during enantiomer separation by complexation gas chromatog. have been detected. Inconsistencies of an empirical quadrant rule, correlating absolute configuration and order of elution of cyclic ethers from nickel(II) bis[3-(heptafluorobutanoyl)-(1R)-camphorate], are reported.

Journal of Chromatography published new progress about 1193-11-9. 1193-11-9 belongs to dioxole, auxiliary class Dioxolanes, name is 2,2,4-Trimethyl-1,3-dioxolane, and the molecular formula is C8H7NO4, COA of Formula: C6H12O2.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem