Day: November 21, 2022

Horio, T. published the artcileA potent attractant of zoospores of Aphanomyces cochlioides isolated from its host, Spinacia oleracea, HPLC of Formula: 110204-45-0, the publication is Experientia (1992), 48(4), 410-14, database is CAplus.

A highly potent attractant of zoospores of A. cochlioides, a causal fungus of the root rot disease of spinach (S. oleracea), was isolated from spinach roots, and its structure was determined by spectroscopic evidence and chem. synthesis as cochliophilin A (5-hydroxy-6,7-methylenedioxyflavone, I). A chromosorb particle prepared by soaking in I solution showed a potent attracting activity toward the zoospores using concentrations of I above 10^-9 or 10^-10 M.

Experientia published new progress about 110204-45-0. 110204-45-0 belongs to dioxole, auxiliary class Flavonoids, name is 9-Hydroxy-6-phenyl-8H-[1,3]dioxolo[4,5-g]chromen-8-one, and the molecular formula is C16H10O5, HPLC of Formula: 110204-45-0.

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

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

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

Yin, Liang published the artcileA Facile Pathway to Enantiomerically Enriched 3-Hydroxy-2-Oxindoles: Asymmetric Intramolecular Arylation of α-Keto Amides Catalyzed by a Palladium-DifluorPhos Complex, Recommanded Product: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, the publication is Angewandte Chemie, International Edition (2011), 50(33), 7620-7623, S7620/1-S7620/90, database is CAplus and MEDLINE.

The first catalytic, enantioselective intramol. aryl-transfer reaction of aryl triflates to ketones has been developed, providing 3-hydroxy-2-oxindoles, e.g., I, from α-keto amides, e.g., II, in 82-99% ee. Initial extension of the methodol. to the synthesis of 4-hydroxydihydroquinolin-2-ones is also explored. This method features overall practicality, including substrate stability and accessibility (protecting-group free) plus no need for the use of stoichiometric amounts of metals.

Angewandte Chemie, International Edition 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 C7H13ClNNaO5S, Recommanded Product: (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole.

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

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

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

Pouretedal, Hamid Reza published the artcileA simple method for predicting the gas-chromatographic retention indices of phenolic derivatives, Formula: C11H14O4, the publication is Journal of the Iranian Chemical Society, database is CAplus.

A simple approach is proposed to predict the gas-chromatog. retention indexes in nonpolar columns for a wide range of phenolic derivatives, through their mol. structures and independent of temperature data and active phase of column. The new model is based on the number of atoms and some structural moieties which depend on intra- and intermol. interactions. The present method can be easily applied for many kinds of phenolic compounds containing different substituents without using special computer codes, which need expert users. A big pool of the exptl. data (335 compounds) of retention indexes is used to construct the new model (80% for training set and 20% for test set). Different statistical parameters including the coefficient of determination, R2 (= 0.9482), root mean squared error, RMSE (= 89.01), and mean absolute percent error, MAPE (= 4.494), are used to investigate the reliability of the model, through both internal and external validation techniques.

Journal of the Iranian Chemical Society 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, Formula: C11H14O4.

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

Islam, Tofazzal Md. published the artcileHost-specific plant signal and G-protein activator, mastoparan, trigger differentiation of zoospores of the phytopathogenic oomycete Aphanomyces cochlioides, COA of Formula: C16H10O5, the publication is Plant and Soil (2003), 255(1), 131-142, database is CAplus.

We found that a gradient of a host-specific attractant, cochliophilin A (5-hydroxy-6,7-methylenedioxyflavone) isolated from the roots of spinach triggered encystment followed by germination of zoospores of Aphanomyces cochlioides at a concentration less than micromolar order. This compound did not affect the growth and reproduction of this phytopathogen up to 10^-6 M concentration in the culture medium. We also observed that mastoparan, an activator of heterotrimeric G-protein could inhibit the motility of zoospores and then strikingly effect encystment followed by 60-80% germination of cysts. Concomitant application of cochliophilin A and mastoparan showed stronger encystment followed by 100% germination of cysts. In addition, we have observed that chems. interfering with phospholipase C activity (neomycin) and Ca²⁺ influx/release (EGTA and loperamide) suppress cochliophilin A or mastoparan induced encystment and germination. These results suggest that G-protein mediated signal transduction mechanism may be involved in the differentiation of the A. cochlioides zoospores. This is the first report on the differentiation of oomycete zoospores initiated by a host-specific plant signal or a G-protein activator.

Plant and Soil published new progress about 110204-45-0. 110204-45-0 belongs to dioxole, auxiliary class Flavonoids, name is 9-Hydroxy-6-phenyl-8H-[1,3]dioxolo[4,5-g]chromen-8-one, and the molecular formula is C16H10O5, COA of Formula: C16H10O5.

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