Dioxole related

Kapkowski, Maciej published the artcileMono- and bimetallic nano-Re systems doped Os, Mo, Ru, Ir as nanocatalytic platforms for the acetalization of polyalcohols into cyclic acetals and their applications as fuel additives, Formula: C6H12O2, the publication is Applied Catalysis, B: Environmental (2018), 154-167, database is CAplus.

We report here that the Re/SiO₂ catalyst can be a suitable low-cost catalyst for processing polyols into acetals in solvent-free conditions with a high conversion rate and selectivity up to 100% in mild conditions. During a complex investigation, we broadly tested the blending potential of the acetals that were formed by measuring properties such as d., viscosity, isentropic compressibility, isobaric thermal expansion, cetane number and other parameters of both the crude additives and the blends that were prepared with petroleum diesel oil. The results indicate that the investigated acetals can generally be used for blending with petroleum diesel oil in order to obtain the valuable biofuels that are in great demand in the contemporary transportation industry due to the regulatory restrictions that have been introduced in order to protect the environment.

Applied Catalysis, B: Environmental 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, Formula: C6H12O2.

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

Bruice, Thomas C. published the artcileA search for carboxyl-group catalysis in ketal hydrolysis, Recommanded Product: 2,2,4-Trimethyl-1,3-dioxolane, the publication is Journal of the American Chemical Society (1967), 89(14), 3568-76, database is CAplus.

The pH-rate profiles for the hydrolysis of 19 1,3-dioxanes and 1,3-dioxolanes, seven of which were carboxyl substituted, were determined The rates of hydrolysis were not sensitive to the concentration of formate and acetate buffers at constant pH showing the compounds were not susceptible to intermol. general acid catalyzed hydrolysis. The log of the pseudo-first-order rate constants (kobsd) for the hydrolysis of all dioxolanes and dioxanes not substituted by carboxyl groups when plotted vs. pH provided linear plots of slope ∼-1.0 indicating the mechanism of hydrolysis is specific acid catalysis. For the carboxyl-substituted dioxolanes and dioxanes, the pH-log kobsd profiles are characterized by the superimposition of a plateau rate upon the specific acid catalyzed region, followed in the low acid region by a descending leg of approx. slope of -1.0. The plateau and second descending leg have kinetically equivalent interpretations as participation by the undissociated carboxyl group in the hydrolysis or the specific acid catalyzed hydrolysis of the carboxylate anion form of the ketals. The latter mechanism is correct on the basis that the log krate values for the calculated constants for specific acid catalyzed hydrolysis of the undissociated ketals (K-CO2H) and dissociated ketals (K-CO2-) exhibit no pos. deviations from Hammett plots (σ*) constructed from the rate constants for specific acid catalysis of the hydrolysis of ketals not containing carboxyl groups. Literature reports of the participation of neighboring carboxyl groups in the hydrolysis of acetals are discussed. 32 references.

Journal of the American Chemical Society 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

Kerber, Paul J. published the artcileKinetics of Aldehyde Flavorant-Acetal Formation in E-Liquids with Different E-Cigarette Solvents and Common Additives Studied by ¹H NMR Spectroscopy, Name: 2-Methoxy-4-(4-methyl-1,3-dioxolan-2-yl)phenol, the publication is Chemical Research in Toxicology (2022), 35(8), 1410-1417, database is CAplus and MEDLINE.

Flavorants, nicotine, and organic acids are common additives found in the e-liquid carrier solvent, propylene glycol (PG) and/or glycerol (GL), at various concentrations Some of the most concentrated and prevalent flavorants in e-liquids include trans-cinnamaldehyde, vanillin, and benzaldehyde. Aldehyde flavorants have been shown to react with PG and GL to form flavorant-PG and -GL acetals that have unique toxicity properties in e-liquids before aerosolization. However, there is still much that remains unknown about the effects of different e-cigarette solvents, water, nicotine, and organic acids on the rate of acetalization in e-liquids We used ¹H NMR spectroscopy to determine the first-order initial rate constant, half-life, and % acetal formed at equilibrium for flavorant-acetal formation in simulated e-liquids Herein, we report that acetalization generally occurs at a faster rate and produces greater yields in e-liquids with higher ratios of GL (relative to PG). trans-Cinnamaldehyde acetals formed the fastest in 100% PG-simulated e-liquids, followed by benzaldehyde and vanillin based on their half-lives and rate constants The acetal yield was greatest for benzaldehyde in PG e-liquids, followed by trans-cinnamaldehyde and vanillin. Acetalization in PG e-liquids containing aldehyde flavorants was inhibited by water and nicotine but catalyzed by benzoic acid. Flavorant-PG acetal formation was generally delayed in the presence of nicotine, even if benzoic acid was present at 2-, 4-, or 10-fold the nicotine concentration, as compared to the PG e-liquids with 2.5 mg/mL flavorant. Thus, com. e-liquids with aldehyde flavorants containing a higher GL ratio (relative to PG), little water, no nicotine, nicotine with excess organic acids, or organic acids without nicotine would undergo acetalization the fastest and with the highest yield. Many com. e-liquids must therefore contain significant amounts of flavorant acetals.

Chemical Research in Toxicology published new progress about 68527-74-2. 68527-74-2 belongs to dioxole, auxiliary class Dioxolane,Benzene,Phenol,Ether, name is 2-Methoxy-4-(4-methyl-1,3-dioxolan-2-yl)phenol, and the molecular formula is C11H14O4, Name: 2-Methoxy-4-(4-methyl-1,3-dioxolan-2-yl)phenol.

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

Farkas, Roland published the artcileSynthesis of 2-(1,4-dioxaspiro[4.5]decan-6-yl)acrylamides from 2-acetylcyclohexanone via palladium-catalysed aminocarbonylation, Quality Control of 177-10-6, the publication is Monatshefte fuer Chemie (2015), 146(10), 1665-1671, database is CAplus.

6-(1-Iodovinyl)-1,4-dioxaspiro[4.5]decane, an iodoalkene obtained from 2-acetylcyclohexanone via ethylene ketal formation, hydrazone formation and iodination, was aminocarbonylated in the presence of a palladium-phosphine precatalyst. Systematic investigations revealed that 2-(1,4-dioxaspiro[4.5]decan-6-yl)acrylamides I [R¹ = H; R² = tBu, CH₂CO₂Me, CH(CH₃)CO₂Me, CH{CH(CH₃)₂}CO₂Me; R¹R² = (CH₂)₅, (CH₂)O(CH₂)₂, CH(CO₂Me)(CH₂)₃] can be obtained in high yields via palladium-catalyzed aminocarbonylation. The influence of the amine nucleophiles and of the reaction conditions on the isolated yields was investigated.

Monatshefte fuer Chemie 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, Quality Control of 177-10-6.

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

Hu, Jing published the artcileLeather odor analysis by GC-MS and simulation, HPLC of Formula: 177-10-6, the publication is Zhongguo Pige (2012), 41(5), 28-31, database is CAplus.

The volatile organic components of different leathers were extracted by Soxhlet extraction and determined with gas chromatog. and mass spectrometry (GC-MS). The leather fragrance was simulated by the sensor anal. based on the GC-MS results. The results show that there are many volatile organic components in the odor of the unfinished and finished sheep garment leathers, cow garment leather and cow car seat leather. These components are hydrocarbons, esters, aldehydes, acids, ethers and ketones, etc. Based on the GC-MS results, the leather fragrance is further prepared

Zhongguo Pige 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, HPLC of Formula: 177-10-6.

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

Sun, Xudong published the artcileSynthesis of a novel multi-SO₃H functionalized ionic liquid and its catalytic activities, Application of 1,4-Dioxaspiro[4.5]decane, the publication is Kinetics and Catalysis (2012), 53(3), 301-305, database is CAplus.

A novel multi-SO₃H functionalized ionic liquid is synthesized and a detailed account of its catalytic activities in acetalization and acetylation is given. The results showed that the ionic liquid is very efficient in the conventional acid-catalyzed reactions with good to excellent yields within a short reaction time. Operational simplicity, small amounts required, low cost of the catalyst, high yields, scalability and reusability are the key features of this methodol., which indicates the high potentialities of the novel ionic liquid to be used in environmentally friendly 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 C7H5BF4O3, Application of 1,4-Dioxaspiro[4.5]decane.

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

Jiang, Dabo published the artcileSynthesis of acetals (ketals) catalyzed by phosphogypsum, COA of Formula: C8H14O2, the publication is Shiyou Huagong (2016), 45(3), 330-334, database is CAplus.

The synthesis of acetals (ketones) catalyzed by phosphogypsum (PG) was explored. The effects of the mole ratio of ethylene glycol to cyclohexanone, catalyst dosage, reaction time, water-carrying agents, cyclohexane dosage and catalyst reuse times on the yields of cyclohexanone glycol ketal were investigated. The results showed that the yield of cyclohexanone glycol ketal reached 99.9% under the conditions of catalyst dosage 7.5% (w), mole ratio of ethylene glycol to cyclohexanone 1.5, cyclohexane 16 mL and reaction time 2.5 h. After PG was reused 8 times, the yield of cyclohexanone glycol ketal still reached 98.5%. The catalytic activities of PG in the syntheses of 12 acetals (ketones) were studied. PG indicated excellent catalytic performances for the synthesis of the 12 acetals (ketones) and was a environmentally friendly solid acid catalyst for the utilization of the byproduct PG from phosphate industry.

Shiyou 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, COA of Formula: C8H14O2.

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

Berhal, Farouk published the artcileRh-catalyzed asymmetric 1,4-addition of arylboronic acids to α,β-unsaturated ketones with DIFLUORPHOS and SYNPHOS analogues, Computed Properties of 503538-69-0, the publication is Journal of Organic Chemistry (2011), 76(15), 6320-6326, database is CAplus and MEDLINE.

Applications of electron-deficient DIFLUORPHOS and SYNPHOS analogs in the rhodium-catalyzed asym. conjugate addition of boronic acids to α,β-unsaturated ketones afford the 1,4-addition adducts e. g., I and II in yields up to 92% and with 99% ee. Particularly, a Rh-catalyzed asym. 1,4-addition of arylboronic acids to nonsubstituted maleimide substrates using the (R)-3,5-diCF₃-SYNPHOS ligand is also reported. This protocol provides access to various enantioenriched 3-substituted succinimide units of biol. interest, in high yields and good to excellent ee up to 93%, which could be upgraded up to 99% ee, after a single crystallization

Journal of Organic Chemistry published new progress about 503538-69-0. 503538-69-0 belongs to dioxole, auxiliary class (Atropisomeric Bisphosphine Ligands, name is (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, and the molecular formula is C38H24F4O4P2, Computed Properties of 503538-69-0.

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

Wang, Xianhua published the artcileComparative study of wet and dry torrefaction of corn stalk and the effect on biomass pyrolysis polygeneration, Application In Synthesis of 1193-11-9, the publication is Bioresource Technology (2018), 88-97, database is CAplus and MEDLINE.

Wet torrefaction (WT) possesses some advantages over dry torrefaction (DT). In this study, a comparative anal. of torrefied corn stalk from WT and DT was conducted along with an investigation of their pyrolysis properties under optimal conditions for biomass pyrolysis polygeneration. Compared with DT, WT removed 98% of the ash and retained twice the amount of hydrogen. The impacts of DT and WT on the biomass macromol. structure was also found to be different using two-dimensional perturbation correlation IR spectroscopy (2D-PCIS). WT preserved the active hydroxyl groups and rearranged the macromol. structure to allow cellulose to be more ordered, while DT removed these active hydroxyl groups and formed inter-crosslinking structures in macromols. Correspondingly, the bio-char yield after WT was lower than DT but the bio-char quality was upgraded due to high ash removal. Furthermore, higher bio-oil yield, higher sugar content, and higher H₂ generation, were obtained after WT.

Bioresource Technology 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 C5H5BrN2, Application In Synthesis of 1193-11-9.

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

Yan, Zhong published the artcileEnantioselective Synthesis of α-Amino Phosphonates via Pd-Catalyzed Asymmetric Hydrogenation, Formula: C38H24F4O4P2, the publication is Organic Letters (2016), 18(4), 692-695, database is CAplus and MEDLINE.

A highly enantioselective palladium-catalyzed hydrogenation of a series of linear and cyclic α-iminophosphonates has been achieved, providing efficient access to optically active α-aminophosphonates with up to 99% ee.

Organic Letters published new progress about 503538-69-0. 503538-69-0 belongs to dioxole, auxiliary class (Atropisomeric Bisphosphine Ligands, name is (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, and the molecular formula is C12H17BO4S, Formula: C38H24F4O4P2.

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