Tag: M.W=250-300

Park, Seung Koo published the artcileHighly fluorinated and photocrosslinkable liquid prepolymers for flexible optical waveguides, Quality Control of 129301-42-4, the publication is Journal of Materials Chemistry (2011), 21(6), 1755-1761, database is CAplus.

We evaluate highly fluorinated liquid prepolymers and their UV-cured films for flexible optical waveguide applications. Two liquid prepolymers, 2,3,5,6,2′,3′,5′,6′-octafluoro-4,4′-bis-[2-{2-[1,1-difluoro-2-(2,3,5,6-tetrafluoro-4-vinyl-phenoxy)-ethoxy]-1,1,2,2-tetrafluoro-ethoxy}-2,2-difluoro-ethoxy]-biphenyl (7) and 2,3,5,6,2′,3′,5′,6′-octafluoro-4,4′-bis-[2-(2-{2-[1,1-difluoro-2-(2,3,5,6-tetrafluoro-4-vinyl-phenoxy)-ethoxy]-1,1,2,2-tetrafluoro-ethoxy}-1,1,2,2-tetrafluoro-ethoxy)-2,2-difluoro-ethoxy]-biphenyl (8), are synthesized with decafluorobiphenyl, 2,3,4,5,6-pentafluoro styrene, and fluorinated triethylene glycol or fluorinated tetraethylene glycol. The prepolymers are photocurable to give flexible and transparent films. The refractive indexes of the films made from the prepolymers are controlled with their blending composition, 1.417-1.437 at a wavelength of 1.31 μm. The optical losses of the films prepared from prepolymers 7 and 8 are 0.25 and 0.23 dB cm^-1 at a wavelength of 1.31 μm, resp. The films are thermostable at temperatures over 400°. The ultimate stress, initial modulus, and elongation of the films prepared from prepolymers 7 and 8 are 17.1 MPa, 1.25 GPa, and 1.5% and 12.3 MPa, 0.44 GPa, and 6.9%, resp. Optical waveguides fabricated from the prepolymers are flexible without any substrate film and the optical losses at a bending radius of 1.5 mm are under 0.2 dB. We identify the liquid prepolymers as possible good candidate materials for flexible optical waveguide applications by studying the optical transmission in flexible optical waveguides fabricated from them.

Journal of Materials Chemistry published new progress about 129301-42-4. 129301-42-4 belongs to alcohols-buliding-blocks, auxiliary class Fluoride,Aliphatic hydrocarbon chain,Alcohol,Ether, name is 2,2′-((Perfluoroethane-1,2-diyl)bis(oxy))bis(2,2-difluoroethanol), and the molecular formula is C6H6F8O4, Quality Control of 129301-42-4.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Boyd, Mary K. published the artcileWater quenching behavior of excited 9-xanthylium cations in aqueous sulfuric acid solutions, SDS of cas: 596-38-3, the publication is Journal of the American Chemical Society (1991), 113(19), 7294-300, database is CAplus.

A series of 9-alkyl- and 9-aryl-substituted xanthylium cations (I; R = H, Me, Me₂CHr, cyclo-Pr, tert-Bu; II; R¹ = H, p-CF₃, p– and m-Me, p– and m-OMe) were generated from the corresponding 9-xanthenols in strongly acidic aqueous MeCH (2:1) solutions (39-78% H₂SO₄). Steady-state irradiation at 370 nm produced the excited cations, all of which were fluorescent in the 520-nm region. Fluorescence lifetimes varied considerably with acid concentration, from subnanosecond values at low acidity to 20-35 ns at high acidity. Stern-Volmer plots of Φ_F°/Φ_F vs. the free water concentration in these acid solutions gave linear plots in all cases, yielding k_q values in the 10⁶-10⁹ M^-1 s^-1 range, depending on substituents. For the 9-aryl systems, a plot of log k_q vs. a recently determined σ^hν scale was reasonably linear (r = 0.974) with a ρ value of -1.5, which is opposite in sign to that recently determined for H₂O quenching of the same cations in their ground states. Possible explanations for this surprising result are considered.

Journal of the American Chemical Society published new progress about 596-38-3. 596-38-3 belongs to alcohols-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Benzene,Alcohol, name is 9-Phenyl-9H-xanthen-9-ol, and the molecular formula is C19H14O2, SDS of cas: 596-38-3.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Kazmierczak, Andrzej published the artcileMechanism of kinetin-induced death of Vicia faba ssp. minor root cortex cells, Safety of 2-(((9H-Purin-6-yl)amino)methyl)-6-methylphenol, the publication is Scientific Reports (2021), 11(1), 23746, database is CAplus and MEDLINE.

Cell death (CD) may be induced by endogenous or exogenous factors and contributes to all the steps of plant development. This paper presents results related to the mechanism of CD regulation induced by kinetin (Kin) in the root cortex of Vicia faba ssp. minor. To explain the process, 6-(2-hydroxy-3-methylbenzylamino)purine (PI-55), adenine (Ad), 5′-amine-5′-deoxyadenosine (Ado) and N-(2-chloro-4-piridylo)-N′-phenylurea (CPPU) were applied to (i) block cytokinin receptors (CKs) and inhibit the activities of enzymes of CK metabolism, i.e., (ii) phosphoribosyltransferase, (iii) kinases, and (iv) oxidases, resp. Moreover, ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid (EGTA), lanthanum chloride (LaCl3), ruthenium red (RRed) and cyclosporine A (CS-A) were applied to (i) chelate extracellular calcium ions (Ca2+) as well as blocks of (ii) plasma-, (iii) endoplasmic reticulum- (ER) membrane Ca2+ ion channels and (iv) mitochondria- (MIT) Ca2+ ions release by permeability transition por (PTP), resp. The measured physiol. effectiveness of these factors was the number of living and dying cortex cells estimated with orange acridine (OA) and ethidium bromide (EB), the amounts of cytosolic Ca2+ ions with chlortetracycline (CTC) staining and the intensity of chromatin and Ca2+-CTC complex fluorescence, resp. Moreover, the role of sorafenib, an inhibitor of RAF kinase, on the vitality of cortex cells and ethylene levels as well as the activities of RAF-like kinase and MEK2 with Syntide-2 and Mek2 as substrates were studied. The results clarified the previously presented suggestion that Kin is converted to appropriate ribotides (5′-monophosphate ribonucleotides), which cooperate with the ethylene and Ca2+ ion signalling pathways to transduce the signal of kinetin-programmed cell death (Kin-PCD). Based on the present and previously published results related to Kin-PCD, the crosstalk between ethylene and MAP kinase signalling, as well as inhibitors of CK receptors and enzymes of their metabolism, is proposed.

Scientific Reports published new progress about 1122579-42-3. 1122579-42-3 belongs to alcohols-buliding-blocks, auxiliary class 5.6_Aromatics,Purines, name is 2-(((9H-Purin-6-yl)amino)methyl)-6-methylphenol, and the molecular formula is C13H13N5O, Safety of 2-(((9H-Purin-6-yl)amino)methyl)-6-methylphenol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Roggatz, Christina C. published the artcileModelling Antifouling compounds of Macroalgal Holobionts in Current and Future pH Conditions, Recommanded Product: 17-Hydroxyheptadecanoic acid, the main research area is pH ocean acidification antifouling compound Rhodophyta Chlorophyta; Macroalgae; and macro-colonizers; antifouling; chemical communication; climate change; micro; ocean acidification.

Marine macroalgae are important ecosystem engineers in marine coastal habitats. Macroalgae can be neg. impacted through excessive colonization by harmful bacteria, fungi, microalgae, and macro-colonisers and thus employ a range of chem. compounds to minimize such colonization. Recent research suggests that environmental pH conditions potentially impact the functionality of such chem. compounds Here we predict if and how naturally fluctuating pH conditions and future conditions caused by ocean acidification will affect macroalgal (antifouling) compounds and thereby potentially alter the chem. defense mediated by these compounds We defined the relevant ecol. pH range, analyzed and scored the pH-sensitivity of compounds with antifouling functions based on their modelled chem. properties before assessing their distribution across the phylogenetic macroalgal groups, and the proportion of sensitive compounds for each investigated function. For some key compounds, we also predicted in detail how the associated ecol. function may develop across the pH range. The majority of compounds were unaffected by pH, but compounds containing phenolic and amine groups were found to be particularly sensitive to pH. Future pH changes due to predicted average open ocean acidification pH were found to have little effect. Compounds from Rhodophyta were mainly pH-stable. However, key algal species amongst Phaeophyceae and Chlorophyta were found to rely on highly pH-sensitive compounds for their chem. defense against harmful bacteria, microalgae, fungi, and biofouling by macro-organisms. All quorum sensing disruptive compounds were found the be unaffected by pH, but the other ecol. functions were all conveyed in part by pH-sensitive compounds For some ecol. keystone species, all of their compounds mediating defense functions were found to be pH-sensitive based on our calculations, which may not only affect the health and fitness of the host alga resulting in host breakdown but also alter the associated ecol. interactions of the macroalgal holobiont with micro and macrocolonisers, eventually causing ecosystem restructuring and the functions (e.g. habitat provision) provided by macroalgal hosts. Our study investigates a question of fundamental importance because environments with fluctuating or changing pH are common and apply not only to coastal marine habitats and estuaries but also to freshwater environments or terrestrial systems that are subject to acid rain. Hence, while warranting exptl. validation, this investigation with macroalgae as model organisms can serve as a basis for future investigations in other aquatic or even terrestrial systems.

Journal of Chemical Ecology published new progress about Acid rain. 13099-34-8 belongs to class alcohols-buliding-blocks, name is 17-Hydroxyheptadecanoic acid, and the molecular formula is C17H34O3, Recommanded Product: 17-Hydroxyheptadecanoic acid.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Spielvogel, Sandra published the artcileDistribution of cutin and suberin biomarkers under forest trees with different root systems, Formula: C17H34O3, the main research area is Fagus Picea Quercus Pseudotsuga root cutin suberin biomarker.

Differences in chem. composition of root compounds and root systems among tree species may affect organic matter (OM) distribution, source and composition in forest soils. The objective of this study was to elucidate the contribution of species specific cutin and suberin biomarkers as proxies for shoot- and root-derived organic carbon (OC) to soil OM at different depths with increasing distance to the stems of four different tree species. The contribution of cutin- and suberin-derived lipids to OM in a Cutanic Alisol was analyzed with increasing soil depth and distance to the stems of Fagus sylvatica L., Picea abies (L.) Karst., Quercus robur L. and Pseudotsuga menziesii (Mirb.) Franco. Cutin and suberin monomers of plants and soils were analyzed by alk. hydrolysis and subsequent gas chromatog.-mass spectrometry. The amount and distribution of suberin-derived lipids in soil clearly reflected the specific root system of the different tree species. The amount of cutin-derived lipids decreased strongly with soil depth, indicating that the input of leaf/needle material is restricted to the topsoil. In contrast to the suberin-derived lipids, the spatial pattern of cutin monomer contribution to soil OM did not depend on tree species. Our results document the importance of tree species as a main factor controlling the composition and distribution of OM in forest soils. They reveal the impact of tree species on root-derived OM distribution and the necessity to distinguish among different zones when studying soil OM storage in forests.

Plant and Soil published new progress about Biomarkers. 13099-34-8 belongs to class alcohols-buliding-blocks, name is 17-Hydroxyheptadecanoic acid, and the molecular formula is C17H34O3, Formula: C17H34O3.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Buckley, Jessie P. published the artcileExposure to Contemporary and Emerging Chemicals in Commerce among Pregnant Women in the United States: The Environmental influences on Child Health Outcome (ECHO) Program, Application In Synthesis of 80-09-1, the publication is Environmental Science & Technology (2022), 56(10), 6560-6573, database is CAplus and MEDLINE.

Prenatal chem. exposures can influence maternal and child health; however, a few industrial chems. are routinely biomonitored. We assessed an extensive panel of contemporary and emerging chems. in 171 pregnant women across the United States (U.S.) and Puerto Rico in the Environmental influences on Child Health Outcome (ECHO) Program. We simultaneously measured urinary concentrations of 89 analytes (103 total chems. representing 73 parent compounds) in nine chem. groups: bactericides, benzophenones, bisphenols, fungicides and herbicides, insecticides, organophosphate esters (OPEs), parabens, phthalates/alternative plasticizers, and polycyclic aromatic hydrocarbons (PAHs). We estimated associations of creatinine-adjusted concentrations with sociodemog. and specimen characteristics. Among our diverse prenatal population (60% non-Hispanic Black or Hispanic), we detected 73 of 89 analytes in � participant and 36 in >50% of participants. Five analytes not currently included in the U.S. biomonitoring were detected in �0% of samples: benzophenone-1, thiamethoxam, mono-2-(propyl-6-carboxy-hexyl) phthalate, monocarboxy isooctyl phthalate, and monohydroxy-iso-decyl phthalate. Many analyte concentrations were higher among individuals of Hispanic ethnicity compared to those of non-Hispanic White women. Concentrations of certain chems. decreased with the calendar year, whereas concentrations of their replacements increased. Our largest study to date identified widespread exposures to prevalent and understudied chems. in a diverse sample of pregnant women in the U. S.

Environmental Science & Technology published new progress about 80-09-1. 80-09-1 belongs to alcohols-buliding-blocks, auxiliary class Ploymers, name is 4,4′-Sulfonyldiphenol, and the molecular formula is C12H10O4S, Application In Synthesis of 80-09-1.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Vaghela, Chetana published the artcileSelective electrochemical sensing of bisphenol derivatives using novel bioelectrode of agarose-guar gum-graphene oxide immobilized with tyrosinase, Category: alcohols-buliding-blocks, the publication is Journal of Environmental Chemical Engineering (2022), 10(3), 107360, database is CAplus.

Bisphenols (BPs) are widely used in manufacturing of recyclable plastic products that are potentially toxic to human beings. In the current investigation, an electrochem. sensor based on a novel bioelectrode of agarose-guar gum-graphene oxide (A-G-GO) immobilized with tyrosinase was developed for bisphenols detection. The sensor was responsive toward six BP derivatives (A, F, E, B, Z and AP) while being non-responsive toward bisphenols S and AF. Formation of A-G-GO composites was confirmed by various anal. techniques. The electrochem. characterization indicated enhanced charge transfer abilities of the composites that helped in improving sensitivity. Mechanism of sensing involved enzymic oxidation of bisphenols to corresponding o-bisphenols and subsequently their reduction on designed bioelectrodes at a potential of 80 mV. The sensor exhibited differential sensitivity toward varied BPs with linear dynamic response in the concentration range of 50-1000 μM and limit of detection ranging from 5 to 50 μM. Based on apparent Km values exhibited by tyrosinase, differential sensitivity toward BPs could be explained. The biosensor was found to be highly selective for bisphenol detection over other tyrosinase substrates with enhanced storage stability of 150 d. The proposed bioelectrode could successfully be used for measurement of bisphenols from plastic food packing material thus demonstrating its practical utility.

Journal of Environmental Chemical Engineering published new progress about 80-09-1. 80-09-1 belongs to alcohols-buliding-blocks, auxiliary class Ploymers, name is 4,4′-Sulfonyldiphenol, and the molecular formula is C31H25F2N5O7S, Category: alcohols-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Stavber, Stojan published the artcileNew, mild method for direct introduction of a fluorine atom into aromatic molecules, Synthetic Route of 596-38-3, the publication is Journal of the Chemical Society, Chemical Communications (1992), 274-5, database is CAplus.

Hydroxyalkyl groups in various aromatic mols. are replaced with a fluorine atom by CsSO₄F at room temperature, regioselectively forming aryl fluorides in high to excellent yields. Thus, reaction of CsSO₄F with 4-methoxybenzyl alc. in MeCN gives 4-methoxyfluorobenzene in 70% yield.

Journal of the Chemical Society, Chemical Communications published new progress about 596-38-3. 596-38-3 belongs to alcohols-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Benzene,Alcohol, name is 9-Phenyl-9H-xanthen-9-ol, and the molecular formula is C14H12O2, Synthetic Route of 596-38-3.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Karaman, Rafik published the artcileConversion of aromatic ketones, benzyl alcohols, and alkyl aryl ethers to aromatic hydrocarbons with lithium 4,4′-di-tert-butylbiphenyl radical anion, Name: 9-Phenyl-9H-xanthen-9-ol, the publication is Tetrahedron Letters (1990), 31(43), 6155-8, database is CAplus.

Treatment of THF solutions of the title compounds with excess lithium (or potassium) metal under ultrasonic irradiation in the presence of catalytic amounts of the electron-transfer agent 4,4′-di-t-butylbiphenyl caused conversions to aromatic hydrocarbons in good yields. Addition of 1 or 2 equiv of alkyl halides prior to aqueous ammonium chloride treatment during workup provided mono- or dialkylated products.

Tetrahedron Letters published new progress about 596-38-3. 596-38-3 belongs to alcohols-buliding-blocks, auxiliary class Other Aromatic Heterocyclic,Benzene,Alcohol, name is 9-Phenyl-9H-xanthen-9-ol, and the molecular formula is C19H14O2, Name: 9-Phenyl-9H-xanthen-9-ol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Seitz, Ann-Katrin published the artcileConcentrated Aqueous Peroxodicarbonate: Efficient Electrosynthesis and Use as Oxidizer in Epoxidations, S-, and N-Oxidations, Related Products of alcohols-buliding-blocks, the publication is Angewandte Chemie, International Edition (2022), 61(25), e202117563, database is CAplus and MEDLINE.

Peroxodicarbonates are of substantial interest as potentially powerful and sustainable oxidizers but have so far been accessible only in low concentrations with unsatisfactory energy efficiency. Concentrated (> 0.9 mol L^-1) peroxodicarbonate solutions have now been made accessible by the electrolysis of aqueous K₂CO₃/Na₂CO₃/KHCO₃ solutions at high c.d. of 3.33 A cm^-2 in an efficiently cooled circular flow reactor equipped with a boron-doped diamond anode and a stainless-steel cathode. Their synthetic potential as platform oxidizers was clearly demonstrated in transformations including sulfoxidation, N-oxidation, and epoxidation

Angewandte Chemie, International Edition published new progress about 80-09-1. 80-09-1 belongs to alcohols-buliding-blocks, auxiliary class Ploymers, name is 4,4′-Sulfonyldiphenol, and the molecular formula is C8H11NO, Related Products of alcohols-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts