Month: December 2022

de Souza, Jaqueline F. published the artcilePhosphine-Functionalized Chitosan Microparticles as Support Materials for Palladium Nanoparticles in Heck Reactions, Formula: C10H10O2, the publication is Catalysis Letters, database is CAplus.

Herein, we investigated the activation and stabilization of Pd nanoparticles using microparticles of chitosan-functionalized with phosphine moieties. The catalytic activity of the prepared material was assessed in a series of Heck reactions, which demonstrated the potential of our catalyst concerning yields and reaction scope. Comparative experiments confirmed the superior performance of the phosphine-modified material with respect to a similar catalyst derived from non-functionalized chitosan. Finally, the prepared catalyst also exhibited appreciable activity even after four consecutive reaction runs, with minimal loss of Pd by leaching.

Catalysis Letters published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Formula: C10H10O2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xu, Zu-Sheng published the artcileSynthesis and characterization of novel ferroelectric liquid crystals and copolymers containing biphenyl azobenzene and/or phenyl biphenyl carboxylate mesogenic groups, Formula: C15H14O3, the publication is Liquid Crystals (1999), 26(3), 351-359, database is CAplus.

Two new ferroelec. liquid crystals, 4-[(S)-1-(ethoxycarbonyl)]ethyl 4-[4′-(9-decenyloxy)biphenyl]azobenzoate (10) and its ester analog 4-[(S)-1-(ethoxycarbonyl)]ethyl {[4-(9-decenyloxy)]biphenyl-4′-yl}carbonyloxybenzoate (17), and side chain polysiloxane copolymers and terpolymers containing various amounts of 10 and 17 as mesogenic side groups have been synthesized. Their mesomorphic and phys. properties have been characterized. Both 10 and 17 exhibit isotropic, SmA*, SmC*, and Sm(I or F)* phases. The copolymer with 17 as the mesogenic group and terpolymers having low content of the azo compound 10 show a SmC* phase over a large temperature range down to room temperature The copolymer with the azo compound 10 as the mesogenic group is amorphous.

Liquid Crystals published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C16H18Br2ClN3O3, Formula: C15H14O3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xu, Zu-Sheng published the artcileAzobenzene-Assisted Alignment of Ferroelectric Liquid Crystals in the Chiral Smectic C Phase with an Alternating Current Field, Computed Properties of 50670-76-3, the publication is Chemistry of Materials (1998), 10(11), 3269-3271, database is CAplus.

An unexpected phenomenon of aligning ferroelec. liquid crystal (FLC) directly in the SmC* phase is observed relatively rapidly in the presence of an ac field, by doping a small amount of an azobenzene derivative into it. There may be some interaction s between the azo compound and the FLC mols. under the a.c. field. Interactions with the rubbed polyimide surface layer may also play a role. The preliminary results show that the kinetics of this azobenzene-assisted alignment depends on the concentration of azobenzene derivative The possibility of aligning FLC mols. in the SmC* phase relatively rapidly by doping with small amounts of azo compounds and by applying an a.c. field may have some useful applications, and it provides a fairly simple method for aligning FLCs.

Chemistry of Materials published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C7H10O4, Computed Properties of 50670-76-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

de Oliveira, Naiara Araujo published the artcile1,3,5-triacryloylhexahydro-1,3,5-triazine improves antibacterial and physicochemical properties of an experimental resin-based cement, Computed Properties of 10287-53-3, the publication is International Journal of Adhesion and Adhesives (2022), 117(Part_A), 103157, database is CAplus.

Stable antibacterial cement could contribute to reducing the biofilm formation for a healthy marginal sealing in high-risk areas in indirect restorations. This study aimed to incorporate 1,3,5-triacryloylhexahydro-1,3,5-triazine (TAT) on exptl. resin-based cements and evaluate its antibacterial and physicochem. properties. An exptl. resin-based cement was formulated with 50 wt% Bisphenol A-Glycidyl Methacrylate (BisGMA), 30 wt% Urethane Dimethacrylate (UDMA), 20 wt% Triethylene Glycol Dimethacrylate (TEGDMA), and initiators. Barium silicate glass was used as a filler (45 wt%) and two different groups were tested: CTAT with 15 wt% TAT addition and CCONTROL with no TAT addition The developed cements were evaluated by their degree of conversion, film thickness, flow, flexural strength, softening solvent, cytotoxicity, and antibacterial activity. Microshear bond strength (μSBS) was evaluated regarding dental tissues, glass-ceramics, and polycrystalline ceramics. CTAT showed a higher degree of conversion, lower cytotoxicity, lower softening solvent, and an increased film thickness when compared to CCONTROL. No statistical difference was found between the groups for flow, flexural strength, planktonic antibacterial anal., and cytotoxicity. Reduced biofilm formation was observed in the CTAT group. CTAT improved the μ SBS values for a polycrystalline ceramic substrate. The addition of 1,3,5-triacryloylhexahydro-1,3,5-triazine showed anti-biofilm activity, increased degree of conversion, decreased cytotoxicity, and increased bond strength for IPS-YTZP substrate tested.

International Journal of Adhesion and Adhesives published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Computed Properties of 10287-53-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Spittler, Terry D. published the artcileBiorational control of crop pests by mating disruption. Residue analyses of Z-9-dodecen-1-yl acetate and Z-11-tetradecen-1-yl acetate in grapes, Category: esters-buliding-blocks, the publication is ACS Symposium Series (1988), 430-6, database is CAplus.

(Z)-9-Dodecen-1-yl acetate (I) and (Z)-11-tetradecen-1-yl acetate (II), primary components of grape berry moth pheromone, were applied in vineyards via tie-on dispensers for the entire growing season. Mature grapes (100 g) were blended and extracted with acetone; following the addition of water, the analytes were extracted into hexane which, after evaporation, was adsorbed onto a Florisil Sep-pak. Elution was with 10% acetone in hexane. Chromatog. was on a Supelcowax 10 capillary column with temperature programming from 80 to 130° at 5°/min then 130 to 200 at 4°/min with a hold 9 min. Detection by HP-MSD Model #5970B was in the selective ion mode at 166 m/e and 194 m/e for I and II, resp. Corresponding retention times were 17.7 and 22.7 min. The sensitivity was <5 ppb for both materials at 80% recovery. Insect control by this biotech. approach was good, and it eliminated the use of traditional chem. pesticides against grape berry moth. No residues were detected in grape berries.

ACS Symposium Series published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C9H6BrNO2, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ramnauth, Jailall published the artcilePhotochemical preparation of cyclopropanes from cyclobutanones, Formula: C12H14O2, the publication is Canadian Journal of Chemistry (2001), 79(2), 114-120, database is CAplus.

A general method for the preparation of cyclopropanes is reported. Triplet-photosensitized reactions of cyclobutanones give cyclopropanes as the major product. Part 1 describes the synthesis of substituted cyclobutanones used. In Part 2, the photo-reactions of cyclobutanones are reported. Triplet-sensitized reactions of cyclobutanones using acetone as a sensitizer give cyclopropanes as the major nonpolar products. The extent of photodecarbonylation seems to be dependent on α-substitution. Electron-donating groups promote decarbonylation while electron-withdrawing groups favor cycloelimination.

Canadian Journal of Chemistry published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, Formula: C12H14O2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Thombal, Raju S. published the artcilePalladium-Catalyzed Direct Oxidative C-H Activation/Annulation for Regioselective Construction of N-Acylindoles, HPLC of Formula: 30414-53-0, the publication is Organic Letters (2020), 22(9), 3397-3401, database is CAplus and MEDLINE.

A Pd(II)-catalyzed C(sp³)-H/C(sp²)-H coupling/annulation of anilides and α-dicarbonyl compounds for the synthesis of diverse N-acyl indoles was described. The reaction was achieved by cascade C-H activation, coupling, and intramol. cyclization. This protocol provided a variety of indoles with high functional group tolerance and excellent regioselectivity. The utility of this protocol was demonstrated by transforming the synthesized compound into diversely functionalized analogs.

Organic Letters published new progress about 30414-53-0. 30414-53-0 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ketone,Ester, name is Methyl 3-oxovalerate, and the molecular formula is C13H16O2, HPLC of Formula: 30414-53-0.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Lin, Jui-Teng published the artcileModeling the Enhanced Efficacy and Curing Depth of Photo-Thermal Dual Polymerization in Metal (Fe) Polymer Composites for 3D Printing, SDS of cas: 15625-89-5, the publication is Polymers (Basel, Switzerland) (2022), 14(6), 1158, database is CAplus and MEDLINE.

This article presents, for the first time, the efficacy and curing depth anal. of photo-thermal dual polymerization in metal (Fe) polymer composites for 3D printing of a three-component (A/B/M) system based on the proposed mechanism of our group, in which the co initiators A and B are Irgacure-369 and charge-transfer complexes (CTC), resp., and the monomer M is filled by Fe. Our formulas show the depth of curing (Zc) is an increasing function of the light intensity, but a decreasing function of the Fe and photoinitiator concentrations Zc is enhanced by the additive [B], which produces extra thermal radical for polymerization under high temperature The heat (or temperature) increase in the system has two components: (i) due to the light absorption of Fe filler and (ii) heat released from the exothermic photopolymerization of the monomer. The heat is transported to the additive (or co-initiator) [B] to produce extra radicals and enhance the monomer conversion function (CF). The Fe filler leads to a temperature increase but also limits the light penetration, leading to lower CF and Zc, which could be overcome by the additive initiator [B] in thick polymers. Optimal Fe for maximal CF and Zc are explored theor. Measured data are analyzed based on our derived formulas.

Polymers (Basel, Switzerland) published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, SDS of cas: 15625-89-5.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Lin, Jui-Teng published the artcileEfficacy modeling of new multi-functional benzophenone-based system for free-radical/cationic hybrid-photopolymerization using 405 nm LED, Application In Synthesis of 15625-89-5, the publication is Journal of Polymer Research (2022), 29(3), 100, database is CAplus.

This article presents, for the first time, the kinetics and the general conversion features of a 3-component system, benzophenone-triphenylamine(BT)/iodonium/Amine, based on proposed mechanism of Liu et al., for both free radical polymerization (FRP) of acrylates and the free radical promoted cationic polymerization (CP) of epoxides using the new multi-functional initiator of BT. The additives, iodonium and amine, Et 4-(dimethylamino)benzoate (EDB), have the dual function of (i) regeneration BT and (ii) produce of extra radicals for improved FRP and CP. Analytic formulas are developed to explore the new features including: (i) the conversion efficacy (CE) of FRP is an increasing function of the light intensity, the effective absorption coefficient, and the concentration sum of each of the components, BT, Iod, amine, for transient state. However, CE at steady-state is independent to the light intensity; (ii) the trifunctional hybrid structures of BT3 leads to larger light absorption than other types of BT; it also provides more active sites for the H-abstraction in the presence of EDB, leading to high CE; (iii) the efficacy of FRP is an increasing function of the amine (EDB) concentration, in contrast to that of CP having an opposite dependence; (iv) the consumption rate of BT3 in the BT3/Iod/EDB system is slower than that of the BT3/Iod system due to photoredox catalytic cycle, and the larger initiator regeneration (RGE)in the three-component system.

Journal of Polymer Research published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, Application In Synthesis of 15625-89-5.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Lin, Jui-Teng published the artcileEfficacy modeling of new multi-functional benzophenone-based system for free-radical/cationic hybrid-photopolymerization using 405 nm LED, Synthetic Route of 10287-53-3, the publication is Journal of Polymer Research (2022), 29(3), 100, database is CAplus.

This article presents, for the first time, the kinetics and the general conversion features of a 3-component system, benzophenone-triphenylamine(BT)/iodonium/Amine, based on proposed mechanism of Liu et al., for both free radical polymerization (FRP) of acrylates and the free radical promoted cationic polymerization (CP) of epoxides using the new multi-functional initiator of BT. The additives, iodonium and amine, Et 4-(dimethylamino)benzoate (EDB), have the dual function of (i) regeneration BT and (ii) produce of extra radicals for improved FRP and CP. Analytic formulas are developed to explore the new features including: (i) the conversion efficacy (CE) of FRP is an increasing function of the light intensity, the effective absorption coefficient, and the concentration sum of each of the components, BT, Iod, amine, for transient state. However, CE at steady-state is independent to the light intensity; (ii) the trifunctional hybrid structures of BT3 leads to larger light absorption than other types of BT; it also provides more active sites for the H-abstraction in the presence of EDB, leading to high CE; (iii) the efficacy of FRP is an increasing function of the amine (EDB) concentration, in contrast to that of CP having an opposite dependence; (iv) the consumption rate of BT3 in the BT3/Iod/EDB system is slower than that of the BT3/Iod system due to photoredox catalytic cycle, and the larger initiator regeneration (RGE)in the three-component system.

Journal of Polymer Research published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Synthetic Route of 10287-53-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics