Month: November 2022

Tang, Shuqin published the artcileA Cocktail of Industrial Chemicals in Lipstick and Nail Polish: Profiles and Health Implications, Computed Properties of 627-93-0, the publication is Environmental Science & Technology Letters (2021), 8(9), 760-765, database is CAplus.

Beauty products contain various industrial chems. to increase their functionality and appearance. The frequent use of beauty products may increase human exposure to industrial chems., but to date, their chem. components remain poorly characterized. Our work characterized the chem. components in lipstick and nail polish by screening for a total of 231 chems. from seven categories, including organophosphate esters (OPEs), phthalate esters (PAEs), non-PAE plasticizers, bisphenol analogs, parabens, UV stabilizers, and antioxidants. Their total concentrations ranged from 38.9 to 3810 μg/g (median of 193 μg/g) and from 18.6 to 1910 μg/g (307 μg/g) in lipstick (n = 34) and nail polish (n = 15), resp. The chem. compositions differed between lipstick and nail polish, but non-PAE plasticizers generally dominated over other groups of chems. A number of emerging plasticizers, OPEs, and UV stabilizers have rarely been reported in personal care products or environmental samples but were found at very high levels in beauty products, raising concern about their environmental release and human exposure risk. Although the employment of a hazard quotient approach suggested low health risks for exposure to industrial chems. from the use of beauty products, potential mixture effects from the chem. cocktail and occupational exposure to beauty products should not be overlooked.

Environmental Science & Technology Letters published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C4Br2N2O4S, Computed Properties of 627-93-0.

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

Tang, Shuqin published the artcileA Cocktail of Industrial Chemicals in Lipstick and Nail Polish: Profiles and Health Implications, Recommanded Product: Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Environmental Science & Technology Letters (2021), 8(9), 760-765, database is CAplus.

Beauty products contain various industrial chems. to increase their functionality and appearance. The frequent use of beauty products may increase human exposure to industrial chems., but to date, their chem. components remain poorly characterized. Our work characterized the chem. components in lipstick and nail polish by screening for a total of 231 chems. from seven categories, including organophosphate esters (OPEs), phthalate esters (PAEs), non-PAE plasticizers, bisphenol analogs, parabens, UV stabilizers, and antioxidants. Their total concentrations ranged from 38.9 to 3810 μg/g (median of 193 μg/g) and from 18.6 to 1910 μg/g (307 μg/g) in lipstick (n = 34) and nail polish (n = 15), resp. The chem. compositions differed between lipstick and nail polish, but non-PAE plasticizers generally dominated over other groups of chems. A number of emerging plasticizers, OPEs, and UV stabilizers have rarely been reported in personal care products or environmental samples but were found at very high levels in beauty products, raising concern about their environmental release and human exposure risk. Although the employment of a hazard quotient approach suggested low health risks for exposure to industrial chems. from the use of beauty products, potential mixture effects from the chem. cocktail and occupational exposure to beauty products should not be overlooked.

Environmental Science & Technology Letters published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C10H16O2, Recommanded Product: Tris(2,4-di-tert-butylphenyl) phosphite.

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

Tang, Shuqin published the artcileA Cocktail of Industrial Chemicals in Lipstick and Nail Polish: Profiles and Health Implications, Recommanded Product: Propyl 3,4,5-trihydroxybenzoate, the publication is Environmental Science & Technology Letters (2021), 8(9), 760-765, database is CAplus.

Beauty products contain various industrial chems. to increase their functionality and appearance. The frequent use of beauty products may increase human exposure to industrial chems., but to date, their chem. components remain poorly characterized. Our work characterized the chem. components in lipstick and nail polish by screening for a total of 231 chems. from seven categories, including organophosphate esters (OPEs), phthalate esters (PAEs), non-PAE plasticizers, bisphenol analogs, parabens, UV stabilizers, and antioxidants. Their total concentrations ranged from 38.9 to 3810 μg/g (median of 193 μg/g) and from 18.6 to 1910 μg/g (307 μg/g) in lipstick (n = 34) and nail polish (n = 15), resp. The chem. compositions differed between lipstick and nail polish, but non-PAE plasticizers generally dominated over other groups of chems. A number of emerging plasticizers, OPEs, and UV stabilizers have rarely been reported in personal care products or environmental samples but were found at very high levels in beauty products, raising concern about their environmental release and human exposure risk. Although the employment of a hazard quotient approach suggested low health risks for exposure to industrial chems. from the use of beauty products, potential mixture effects from the chem. cocktail and occupational exposure to beauty products should not be overlooked.

Environmental Science & Technology Letters published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C38H74Cl2N2O4, Recommanded Product: Propyl 3,4,5-trihydroxybenzoate.

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

Liu, Jie published the artcileSingle-, Dual-, Triple, and Quadruple-Wavelength Surface-Emitting Lasing in Blue-Phase Liquid Crystal, Product Details of C15H20O6, the publication is Advanced Materials (Weinheim, Germany) (2022), 34(9), 2108330, database is CAplus and MEDLINE.

Soft organic lasers with multiwavelength output and high spectral purity are of crucial importance for versatile photonic devices, owing to their monochromaticity, coherence, and high intensity. However, there remain challenges for the achievement of surface-emitting multiwavelength lasing in soft photonic crystals, and the relative mechanisms need to be investigated. Herein, single-, dual-, triple-, and quadruple-wavelength lasers are successfully achieved in dye-doped blue-phase liquid crystal (BPLC) film. The number and wavelength of the lasing peaks can be manipulated by tuning the center of the bandgap, the order parameter of the laser dye, the quality of the resonance cavity, and even the pump energy. For single-wavelength lasing, a lasing peak with an ultranarrow linewidth of 0.04 nm (Q-factor of 13 454) is achieved. Multiwavelength lasing is attained based on the following aspects: i the narrow bandgaps of the BPLCs with full width at half maximum of 14-20 nm; ii a laser dye with high gain over a wide wavelength band, having a low-order parameter in the liquid crystal matrix; iii appropriate relative positions between the reflection and fluorescence peaks; and iv the highly ordered crystal lattice of BPLC film. The proposed single-to-quadruple-wavelength surface-emitting lasers can be employed as coherent light sources for next-generation optical devices.

Advanced Materials (Weinheim, Germany) 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, Product Details of C15H20O6.

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

Ranganathan, Palraj published the artcileOptically transparent bio-based polyamides with microcellular foaming properties derived from renewable difunctional aminoamides, Application In Synthesis of 627-93-0, the publication is Journal of Applied Polymer Science (2022), 139(2), 51461, database is CAplus.

A green approach for the synthesis of bio-based polyamides (PAs) with a new macromol. structure was developed. These bio-based PAs were synthesized by solvent and catalyst-free polycondensation combining fatty dimer acid Pripol 1009 with new difunctional aminoamides (DAAs). The later DAAs building blocks were synthesized by aminolysis of renewable di-Me sebacate (DMS) and di-Me adipate (DMA) with 3 different aliphatic diamines having diverse chain lengths, 2, 4, and 6 carbons. Bio-based PAs showed M_w up to 30,581 g/mol, initial thermal degradation over 380°, T_m from 168.3-202.4°C, T_g from 28.3-37.5°C, strain from 36.4 ±4.0-313.5 ±2.0%, and tensile strength up to 27.4 ±0.1 MPa. All the PAs films had excellent optical transparency with cut-off wavelengths of 276.0-283.0 nm, transmittance from 82.7%-90.7% at 600 nm. As a proof-of-concept of their usage, 1 of the PA can form microcellular foam by the green scCO₂ method. The foams possessed uniform (cell size; 40μm, foam d.; 0.265 g/cm³, expansion rate; 7.2) and bimodal (cell size; 24/38μm, foam d.; 0.302 g/cm³, expansion rate; 6.5) cell textures depending on their foaming temperatures This is the first report of bio-based PA foams and transparent films manufacturing without toxic solvents.

Journal of Applied Polymer Science published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Application In Synthesis of 627-93-0.

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

Du, Yiming published the artcileTransition-Metal-Free, Intermolecular Azidoheteroarylation of Alkenes: Efficient Access to β-Azidoalkylated Quinoxalinones and Preliminary Antifungal Evaluation Against Magnaporthe grisea, Product Details of C12H14O2, the publication is Synthesis (2020), 52(16), 2395-2409, database is CAplus.

An efficient, PhI(OAc)₂-mediated, radical azidoheteroarylation of alkenes under transition-metal-free conditions is reported by employing TMSN₃ and quinoxalin-2(1 H)-ones as coupling partners. This domino reaction allows an efficient synthesis of valuable orangoazides containing quinoxalin-2(1 H)-one derivatives and could be extended to phosphinyl-alkylated quinoxalin-2(1 H)-one in a single step in moderate to excellent yields under mild conditions, as demonstrated by the preliminary antifungal evaluation against Magnaporthe grisea for the first time. Mechanistic studies revealed that this transformation undergoes a cascade addition pathway controlled by a polar radical. Thus, e.g., 1-methylquinoxalin-2(1H)-one + 1-hexene + TMSN₃ â†?I (96%) in MeCN in presence of Li₂CO₃ as base and PhI(OAc)₂ as oxidant.

Synthesis 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, Product Details of C12H14O2.

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

Xu, Yuanyuan published the artcileRadical Photopolymerization Using 1,4-Dihydropyrrolo[3,2-b]pyrrole Derivatives Prepared via One-Pot Synthesis, Quality Control of 10287-53-3, the publication is ACS Omega (2021), 6(32), 20902-20911, database is CAplus and MEDLINE.

Radical photopolymerization has attracted significant attention for manufacturing products with complicated structures. Herein, the synthesized 1,4-bis(4-bromophenyl)-2,5-bis(4-nitrophenyl)-1,4-dihydropyrrole[3,2-b]pyrrole (PyBN, I, CAS Number 2561424-73-3) is found to show varying photoactivity upon irradiation at different wavelengths. PyBN affords two main absorption bands, and its maximum absorption peak is at 462 nm, attributing to its strong intramol. charge transfer property based on the donor-acceptor structure. It efficiently photoinitiates the radical photopolymerization of different (meth)acrylate materials under 365 and 395 nm LED irradiation The highest double bond conversion of 99.86% is achieved for these materials. Under 470 nm LED, PyBN does not show mol. structure change from photolysis results as a result of intramol. charge transfer. Therefore, PyBN shows wavelength-selective photoactivity with potential application in dual-wavelength volumetric additive manufacturing A unique solid product is successfully fabricated using a 365 nm LED with co-irradiation of a 470 nm LED. Addnl., PyBN incorporating camphorquinone (CQ) as a two-component visible light photoinitiator system is investigated under 470 nm LED irradiation As PyBN has a charge transfer activity at 470 nm, the combination with CQ exhibits a good synergistic interaction. Besides nitro-based PyBN, a methyl-based PyBC was prepared as a reference compound

ACS Omega 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 C20H17FO4S, Quality Control of 10287-53-3.

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

Zhang, Xu published the artcileBiodegradable Copolyesters with Unexpected Highly Blocky Microstructures and Enhanced Thermal Properties, Synthetic Route of 627-93-0, the publication is ACS Sustainable Chemistry & Engineering (2022), 10(14), 4438-4450, database is CAplus.

To synthesize novel biodegradable polyesters with high heat resistance and good crystallization capability, we designed a series of aliphatic-aromatic copolyesters, i.e., poly(isoidide-2,5-dimethylene adipate-co-terephthalate)s (PIATs) based on isoidide-2,5-dimethanol (IIDML), a rigid carbohydrate-based building block. The M_n values and intrinsic viscosities of PIAT copolyesters containing up to 40 mol % aromatic moieties are in the range of 6 000-19 000 g·mol^-1 and 0.5-0.87 dL·g^-1, resp. Interestingly, the products were obtained as blocky copolymers after the one-pot melt polycondensation process because of the thermodn. equilibrium of IIDML moieties driven by the insufficient thermal stability of the IIDML moieties. In addition, all the copolyesters are semicrystalline with crystallinity from 28% to 55% and tunable T_m values ranging from 88°C to a remarkable 189°C. They exhibit better (bio)degradability than the same type of polyesters. This work shows that this green monomer plays a key role in balancing thermal properties (especially T_g) and (bio)degradability, and these polyesters potentially broaden the application toward, for example, fibers.

ACS Sustainable Chemistry & Engineering published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C6H13I, Synthetic Route of 627-93-0.

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

Wang, Jinwei published the artcilePhotocured polyacrylate coatings modified by polybutadiene derivatives with multiunsaturated reactive bonds, Application of Trimethylolpropane triacrylate, the publication is Journal of Coatings Technology and Research, database is CAplus.

Maleic anhydride-g-poly(1,2-butadiene) (MLPB) is used as a rubber flexibilizer to modify UV-curable polyacrylate coatings (PA) in an attempt to improve their wear resistance and water tolerance. Fourier transform IR spectra results show that the unsaturated reactive bonds of MLPB fully participate in the UV-curing reaction and successfully copolymerized with acrylates to obtain robust coatings. The smooth and broad differential scanning calorimeter curves show that the cured systems had good compatibility and their glass transition temperatures (Tg) increase from about 63°C to 74°C with the increase of MLPB addition up to 6 wt%. With the addition of MLPB in PA matrix, their cross-sectional scanning electron microscope (SEM) pictures show brittle features with coarser and dimpled microcracks transforming to toughened fracture morphol. with particles offsetting microcrack propagation when MLPB content is added up to 4-6 wt%. The wear scar profiles show that the cross-sectional areas decrease significantly with the MLPB addition, implying the improvement in the wear-resisting ability of PA composite toughened by MLPB; the hardness, impact resistance, and adhesion could be also improved when MLPB was controlled less than 6 wt%. Compared with the pure polyacrylate coatings, the modified coatings exhibited an improvement in water resistance before and after 48-h UV aging.

Journal of Coatings Technology and 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 C9H21NO3, Application of Trimethylolpropane triacrylate.

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

Rajagopal, Basker published the artcileCu(I)-Catalyzed Synthesis of Dihydropyrimidin-4-ones toward the Preparation of β- and β³-Amino Acid Analogues, COA of Formula: C10H19NO3, the publication is Journal of Organic Chemistry (2014), 79(3), 1254-1264, database is CAplus and MEDLINE.

A copper-(I)-catalyzed synthesis of substituted dihydropyrimidin-4-ones, e.g., I (X-rays single crystal structure shown), from propargyl amides via the formation of ketenimine intermediate has been successfully developed; the synthesis afforded good isolated yields (80-95%). The mild reaction conditions at room temperature allow the reaction to proceed to completion in a few hours without altering the stereochem. Further, by involving a variety of reactive nucleophiles, the obtained substituted dihydropyrimidin-4-ones were elegantly transformed into the corresponding β- and β³-amino acid analogs.

Journal of Organic Chemistry published new progress about 106391-88-2. 106391-88-2 belongs to esters-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Aldehyde, name is (R)-tert-Butyl (3-methyl-1-oxobutan-2-yl)carbamate, and the molecular formula is C10H19NO3, COA of Formula: C10H19NO3.

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