Tag: M.W=100-150

Wang, Rui published the artcileCrystal structure, thermal decomposition mechanism and catalytic performance of hexaaquaaluminum methanesulfonate, Recommanded Product: 1,4-Dioxaspiro[4.5]decane, the publication is Journal of Coordination Chemistry (2017), 70(8), 1327-1338, database is CAplus.

Hexaaquaaluminum methanesulfonate crystals, [Al(H₂O)₆][CH₃SO₃]₃ (1) were synthesized by a hydrothermal reaction of Al(OH)₃ with methanesulfonic acid. Single-crystal diffraction determination revealed that Al³⁺ was coordinated by six water mols. in octahedral geometry, while the CH₃SO₃^– anion connected with Al³⁺ through coordinated water mols. by hydrogen bonds. The six-coordinate environment of Al was also determined by ²⁷Al MAS NMR measurement. TGA and FTIR spectroscopy showed that the decomposition intermediate at 265-365° was Al₂(μ-OH)(CH₃SO₃)₅ (2) and the final product was amorphous Al₂O₃ residue with ∼0.8% SO₃ at 520-800°. A pure phase of [Al(H₂O)₆][CH₃SO₃]₃ was confirmed by powder x-ray diffraction anal. Esterification of n-butyric acid with n-butanol and ketalization of cyclohexanone with glycol catalyzed by [Al(H₂O)₆][CH₃SO₃]₃ and Al₂(μ-OH)(CH₃SO₃)₅, resp., proceeded in 100% yield by continuously removing the produced water. In the case of tetrahydropyranylation of n-butanol at room temperature in dichloromethane, the catalytic activity of [Al(H₂O)₆][CH₃SO₃]₃ was much lower than that of Al₂(μ-OH)(CH₃SO₃)₅. Furthermore, both [Al(H₂O)₆][CH₃SO₃]₃ precursor and Al₂(μ-OH)(CH₃SO₃)₅ catalysts could be recycled.

Journal of Coordination 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 C8H6BF3O3, Recommanded Product: 1,4-Dioxaspiro[4.5]decane.

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

Zhao, Shen published the artcileAcetalization of aldehydes and ketones over H₄[SiW₁₂O₄₀] and H₄[SiW₁₂O₄₀]/SiO₂, Formula: C8H14O2, the publication is Catalysis Science & Technology (2014), 4(8), 2618-2625, database is CAplus.

H₄[SiW₁₂O₄₀] (H-SiW₁₂) is demonstrated to be able to efficiently catalyze the acetalization of aldehydes and ketones with ethylene glycol and 1,3-propanediol. Nevertheless, the possible leaching and the recycling of H-SiW₁₂ are two major disadvantages that largely restrict its further application in industry. Moreover, H₄[SiW₁₂O₄₀] tends to deactivate strong proton sites due to the small surface area of 10 m² g^-1. Due to interactions with surface silanol groups, the proton sites of polyoxometalates (POMs) on SiO₂ are less susceptible to deactivation. As such, immobilization of H₄[SiW₁₂O₄₀] onto SiO₂ leads to the heterogeneous catalyst H₄[SiW₁₂O₄₀]/SiO₂ (H-SiW₁₂/SiO₂), which can catalyze the acetalization of aldehydes and ketones with ethylene glycol and 1,3-propanediol selectively and efficiently without the need of a drying agent. The acetalization process can proceed smoothly at a relatively low temperature under solvent-free conditions. The catalyst of H₄[SiW₁₂O₄₀]/SiO₂ can be recycled at least ten times without an obvious decrease in its catalytic activity. As far as we know, the TONs of the H-SiW₁₂/SiO₂-catalyzed acetalization of cyclohexanone with ethylene glycol, and benzaldehyde with 1,3-propanediol are the highest reported so far.

Catalysis Science & Technology 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, Formula: C8H14O2.

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

Jadhav, Sumit V. published the artcileNanosized sulfated zinc ferrite as catalyst for the synthesis of nopol and other fine chemicals, SDS of cas: 177-10-6, the publication is Catalysis Today (2012), 198(1), 98-105, database is CAplus.

A nanosized highly ordered mesoporous zinc ferrite (ZnFe₂O₄; ZF) was synthesized via co-precipitation method, further sulfated with ammonium sulfate solution to obtain sulfated ZF (SZF) and have been used for the synthesis of nopol by Prins condensation of β-pinene and paraformaldehyde. The NH₃-TPD and pyridine sorption DRIFT-IR studies revealed the significant enhancement in Lewis acidic sites of the zinc ferrite on sulfatation. The influence of various reaction parameters such as reaction temperature, effect of substrate stoichiometry and catalyst loading has been investigated. It gave 70% conversion of β-pinene with 88% selectivity to nopol. The spent catalyst was regenerated and reused successfully up to four cycles with slight loss in catalytic activity. The nanosized SZF catalyst was found to be highly active towards several other com. important acid catalyzed reactions such as isomerization, acetalization and aldol condensation.

Catalysis Today 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, SDS of cas: 177-10-6.

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

Kwon, Ki-Dong published the artcileCharacterization of emissions composition for selected household products available in Korea, HPLC of Formula: 1193-11-9, the publication is Journal of Hazardous Materials (2007), 148(1-2), 192-198, database is CAplus and MEDLINE.

This study examined the emission composition for 59 household products currently sold in Korea, using a headspace anal. The chem. composition and concentrations of total volatile organic compounds (VOCs) broadly varied along with products, even within the same product category. Up to 1-17 organics were detected in the headspace gas phase of any one of the products. The chem. composition of certain household products determined in the current study was different from that of other studies from other countries. Between 4 and 37 compounds were detected in the headspace gas phase of each product class. Several compounds were identified in >1 product class. Of the 59 household products analyzed, 58 emitted ≥1 of the 72 compounds at chromatog. peak areas above 10⁴. There were 11 analytes which occurred with a frequency of >10%: Limonene (44.2%), ethanol (30.5%), acetone (18.6%), α-pinene (18.6%), o,m,p-xylenes (18.6%), decane (17.0%), toluene (17.0%), β-myrcene (11.9%), ammonia (10.2%), ethylbenzene (10.2%), and hexane (10.2%).

Journal of Hazardous 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, HPLC of Formula: 1193-11-9.

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

Maruyama, Kazuya published the artcileAlternating Cationic Copolymerization of Vinyl Ethers and Aryl-Substituted Cyclic Acetals: Structural Investigation of Effects of Cyclic Acetals on Copolymerizability, Recommanded Product: 2,2,4-Trimethyl-1,3-dioxolane, the publication is Macromolecules (Washington, DC, United States) (2022), 55(10), 4034-4045, database is CAplus.

The effects of the structural difference of cyclic acetals were investigated in the cationic copolymerization with vinyl monomers via the concurrent vinyl-addition and ring-opening mechanisms. A series of alkyl- and aryl-substituted cyclic acetals were successfully copolymerized with 2-chloroethyl vinyl ether (CEVE) under appropriate conditions. In particular, copolymerization of an aryl-substituted 2-(4-methoxyphenyl)-1,3-dioxolane (PMPDOL) with CEVE involved exclusive crossover reactions between PMPDOL and CEVE, resulting in alternating copolymers. Copolymerization of PMPDOL and other vinyl ethers and styrene derivatives also proceeded via the frequent crossover reactions, while the copolymerization of 2-methyl-1,3-dioxolane, a methyl-substituted counterpart of PMPDOL, with vinyl monomers except for CEVE proceeded negligibly. The difference in the substituents of cyclic acetals significantly affected the electronic and steric environments around the carbocation generated in the propagation reaction, which is related to the frequency of the crossover reaction. Acid hydrolysis of alternating copolymers resulted in complete degradation and selective generation of a single compound due to the periodic incorporation of acetal structures in the main chains, which supported the well-defined structure of copolymers. The monomer reactivity ratios were also consistent with the copolymerizability difference between the aryl- and alkyl-substituted cyclic acetals. The structure-polymerizability relationship of cyclic acetals in the copolymerization was discussed based on the reaction mechanism during the propagating reaction.

Macromolecules (Washington, DC, United States) 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

Maruyama, Kazuya published the artcileAlternating Cationic Copolymerization of Vinyl Ethers and Aryl-Substituted Cyclic Acetals: Structural Investigation of Effects of Cyclic Acetals on Copolymerizability, Application In Synthesis of 177-10-6, the publication is Macromolecules (Washington, DC, United States) (2022), 55(10), 4034-4045, database is CAplus.

The effects of the structural difference of cyclic acetals were investigated in the cationic copolymerization with vinyl monomers via the concurrent vinyl-addition and ring-opening mechanisms. A series of alkyl- and aryl-substituted cyclic acetals were successfully copolymerized with 2-chloroethyl vinyl ether (CEVE) under appropriate conditions. In particular, copolymerization of an aryl-substituted 2-(4-methoxyphenyl)-1,3-dioxolane (PMPDOL) with CEVE involved exclusive crossover reactions between PMPDOL and CEVE, resulting in alternating copolymers. Copolymerization of PMPDOL and other vinyl ethers and styrene derivatives also proceeded via the frequent crossover reactions, while the copolymerization of 2-methyl-1,3-dioxolane, a methyl-substituted counterpart of PMPDOL, with vinyl monomers except for CEVE proceeded negligibly. The difference in the substituents of cyclic acetals significantly affected the electronic and steric environments around the carbocation generated in the propagation reaction, which is related to the frequency of the crossover reaction. Acid hydrolysis of alternating copolymers resulted in complete degradation and selective generation of a single compound due to the periodic incorporation of acetal structures in the main chains, which supported the well-defined structure of copolymers. The monomer reactivity ratios were also consistent with the copolymerizability difference between the aryl- and alkyl-substituted cyclic acetals. The structure-polymerizability relationship of cyclic acetals in the copolymerization was discussed based on the reaction mechanism during the propagating reaction.

Macromolecules (Washington, DC, United States) 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 In Synthesis of 177-10-6.

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

Salomaa, Pentti published the artcileHydrolysis of 1,3-dioxolane and its alkyl-substituted derivatives. I. Structural factors influencing the rates of hydrolysis of a series of methyl-substituted dioxolanes, Safety of 2,2,4-Trimethyl-1,3-dioxolane, the publication is Acta Chemica Scandinavica (1961), 871-8, database is CAplus.

The exptl. techniques for the rate studies were dilatometric, for dioxolane derivatives which carried one or two Me groups at the 2-position, and titrimetric, for those derivatives that did not carry substituents at the 2-position. Based on the magnitude of the activation entropies, it was probable that the dioxolanes hydrolyzed by essentially the same mechanism as acyclic acetals. The introduction of a methyl group at the 2-position increased the rate of hydrolysis of dioxolanes by a factor of 10³-10⁴, primarily due to low activation energies. A second Me group at the 2-position increased the rate by another power of 10. The addition of one or more Me groups as substituents at the 4- and 5-position had a more complex influence on the rate of hydrolysis, most likely because of interaction of steric strain and polar effects. The polar factors involved were similar to those observed in acyclic acetals. The steric strain considerations which involved the partial 2,3-double bond after proton uptake at the 1-position also permitted distinguishing between cis- and trans-2,4-dimethyl-1,3-dioxolane, the cis form hydrolyzing about 4 times faster than the trans form.

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, Safety of 2,2,4-Trimethyl-1,3-dioxolane.

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

Schormueller, Josef published the artcileAnalysis of volatile aroma substances in tomatoes by gas chromatography and mass spectroscopy, Name: 2,2,4-Trimethyl-1,3-dioxolane, the publication is Zeitschrift fuer Lebensmittel-Untersuchung und -Forschung (1969), 141(1), 1-9, database is CAplus.

The following hitherto unknown components of tomato aroma were identified: C6H6, CHCl3, Et2CO, 2-ethylfuran, 2,2,4-trimethyl-1,3-dioxolane, MeCOBu, MeSSMe, PhMe, p-xylene, cis-PrCH:CHCHO, C6H13CHO, triisobutylene, cyclooctatetraene, C10H22, EtO(PrO)CHMe, C5H11CO2Me, EtCH:CH(CH2)2OAc, iso-PrPh, 1,3,5-Me3C6H3, BuCH:CHCHO, C11H24, 1,2,3-Me3C6H3, (PrO)2CHMe, o-Cl2C6H4, EtCOCH:CH2 or CH2:CHCOCHO, MeCH:CMeCHO, BuCN, EtCH:CHCHO, MeCH:-CHCH2CHO, EtCH(OH)CH:CH2, EtCH:CMeCHO, EtO(iso-C5H11O)CHMe, myrcene, 3-carene, isomeric methylheptenone, and isomeric methylhexanol. 37 references.

Zeitschrift fuer Lebensmittel-Untersuchung und -Forschung 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, Name: 2,2,4-Trimethyl-1,3-dioxolane.

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

Quinio, Pauline published the artcileSc(OTf)3-Catalyzed Addition of Bromomagnesium 2-Vinyloxy Ethoxide to Various Aldehydes Leading to Protected Aldol Products, Product Details of C8H14O2, the publication is Synlett (2016), 27(11), 1715-1719, database is CAplus.

The addition of bromomagnesium 2-vinyloxy ethoxide to various aldehydes in the presence of 10 mol% Sc(OTf)₃ provides a broad range of functionalized protected aldol compounds The enantioselective preparation of these aldols can be achieved by a Swern oxidation-CBS reduction sequence. Use of the dioxolane derived from 2-bromocyclohexanone provides the expected aldol product as the anti-diastereoisomer (dr >99:1).

Synlett 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, Product Details of C8H14O2.

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

Du, Ya published the artcileSn-catalyzed synthesis of propylene carbonate from propylene glycol and CO₂ under supercritical conditions, Related Products of dioxole, the publication is Journal of Molecular Catalysis A: Chemical (2005), 241(1-2), 233-237, database is CAplus.

Dibutyltin oxide or dibutyltin dimethoxide was first used as a remarkable selective catalyst for the synthesis of propylene carbonate from propylene glycol and carbon dioxide. The effects of the reaction parameters, such as reaction time, temperature and CO₂ pressure on the amount of propylene carbonate were also exptl. studied. Under the optimized conditions, the amount of propylene carbonate was nearly proportional to PG concentration The use of N,N-dimethylformamide as a co-solvent in this study significantly enhanced the catalytic activity, and the ketals as dehydrating agents greatly improved the yield of PC, which can be limited by the equilibrium A postulated mechanism for the dibutyltin oxide-catalyzed carboxylation of propylene glycol was also discussed.

Journal of Molecular Catalysis A: Chemical 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, Related Products of dioxole.

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