Category: esters-buliding-blocks

Oliveira, Michelle Leal published the artcileLong-term bond strength of glass fiber post to composite resin does not depend on surface treatment with silane coupling agent or universal adhesive, Related Products of esters-buliding-blocks, the publication is International Journal of Adhesion and Adhesives (2021), 102931, database is CAplus.

This study evaluated the effect of glass fiber post (GFP) surface treatment with or without a silane coupling agent, associated with adhesive systems with or without silane in their composition, on the long-term bond strength to resin composite. Sixty GFPs (Whitepost DC number 2, FGM) were cleaned using 70% ethanol, and randomly divided into two groups, either with or without pretreatment with silane (Ceramic Primer, 3 M ESPE), for 60 s. Each group was further subdivided into three groups, according to the adhesive system applied over the GFP (n = 10): UAS (Scotchbond Universal, 3 M ESPE), E&R – etch-and-rinse adhesive system (Adper Single Bond Plus, 3 M ESPE), and a control group with no adhesive system. The GFPs were centralized in a cylindrical matrix, and a nanoparticulate resin composite (Filtek Supreme Ultra, 3 M ESPE) was inserted and photoactivated. After 48 h, the samples were sectioned in slices, two of which were immediately (48 h) submitted to the push-out bond strength test, and another two, after 6 mo of storage in water. The failure mode was evaluated with a stereomicroscope under 40x magnification, and classified using scores. Three-way ANOVA (α = 0.05) showed that the triple interaction of pretreatment with silane, use of adhesive and time period were significant (p = 0.019). After 48 h, the application of silane resulted in a significant increase in bond strength values, regardless of the adhesive application (p = 0.013), but this effect was no longer observed after 6 mo (p = 0.677). Application of UAS did not influence bond strength values, regardless of silane application or storage time (p > 0.05). As for E&R, significantly higher bond strength was observed after 6 mo, compared with 48 h (p = 0.040). When post silanization was performed with no adhesive system, there was no difference in bond strength between 48 h and 6 mo storage time (p > 0.05). When there was neither silanization, nor an adhesive system, a significantly higher bond strength was observed after 6 mo, compared with 48 h (p < 0.05). Most of the failure types were classified as mixed in both of the water storage time periods. The long-term bond strength of the GFP to composite resin did not depend on post surface treatment with silane, or application of either a UAS or a E&R system.

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, Related Products of esters-buliding-blocks.

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

Barta, Katalin published the artcileA new class of 3′-sulfonyl BINAPHOS ligands: modulation of activity and selectivity in asymmetric palladium-catalysed hydrophosphorylation of styrene, HPLC of Formula: 126613-06-7, the publication is Advanced Synthesis & Catalysis (2008), 350(13), 2013-2023, database is CAplus.

Pd-catalyzed mono-phosphorylation of (R)-2,2′-bisperfluoroalkanesulfonates of BINOL (R^F = CF₃ or C₄F₉) by a diaryl phosphinate [Ar₂P(O)H] followed by phosphine oxide reduction (Cl₃SiH) then Li diisopropylamide-mediated anionic thia-Fries rearrangement furnishes enantiomerically-pure (R)-2′-diarylphosphino-2′-hydroxy-3′-perfluoralkanesulfonyl-1,1′-binaphthalenes [(R)-8ab and (R)-8g–j], which can be further diversified by Grignard reagent (RMgX)-mediated CF₃-displacement [→(R)-8c–f]. Coupling of (R)-8a–j with (S)-1,1′-binaphthalene-2,2′-dioxychlorophosphine (S)-9 generates 3′-sulfonyl BINAPHOS ligands (R,S)-10a–j in good yields (43-82%). These new ligands are of utility in the asym. hydrophosphonylation of styrene by 4,4,5,5-tetramethyl-1,3,2-dioxaphospholane 2-oxide, for which a combination of the chiral ligands with either [Pd(Cp)(allyl)] or [Pd(allyl)(MeCN)₂]⁺/NaCH(CO₂Me)₂ proves to be a convenient and active pre-catalyst system. A combination of an electron-rich phosphine moiety and an electron-deficient 3′-sulfone moiety provides the best enantioselectivity to date for this process, affording the branched 2-phenethenephosphonate, (-)-iso-3, in up to 74% ee with ligand (R,S)-10i, where Ar = p-anisyl and the 3′-SO₂R group is triflone.

Advanced Synthesis & Catalysis published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C22H12F6O6S2, HPLC of Formula: 126613-06-7.

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

Schulz, Stefan published the artcileAn Antiaphrodisiac in Heliconius melpomene Butterflies, Recommanded Product: Isobutyl palmitate, the publication is Journal of Chemical Ecology (2008), 34(1), 82-93, database is CAplus and MEDLINE.

Gilbert (1976) suggested that male-contributed odors of mated females of Heliconius erato could enforce monogamy. The authors investigated the pheromone system of a relative, Heliconius melpomene, using chem. anal., behavioral experiments, and feeding experiments with labeled biosynthetic pheromone precursors. The abdominal scent glands of males contained a complex odor bouquet, consisting of the volatile compound (E)-β-ocimene together with some trace components and a less volatile matrix made up predominately of esters of common C₁₆– and C₁₈-fatty acids with the alcs. ethanol, 2-propanol, 1-butanol, isobutanol, 1-hexanol, and (Z)-3-hexenol. This bouquet is formed during the first days after eclosion, and transferred during copulation to the females. Virgin female scent glands do not contain these compounds The transfer of ocimene and the esters was shown by anal. of butterflies of both sexes before and after copulation. Addnl. proof was obtained by males fed with labeled D–¹³C₆– glucose. They produced ¹³C-labeled ocimene and transferred it to females during copulation. Behavioral tests with ocimene applied to unmated females showed its repellency to males. The esters did not show such activity, but they moderated the evaporation rate of ocimene. The authors’ investigation showed that β-ocimene is an antiaphrodisiac pheromone of H. melpomene.

Journal of Chemical Ecology published new progress about 110-34-9. 110-34-9 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ester, name is Isobutyl palmitate, and the molecular formula is C23H20BN, Recommanded Product: Isobutyl palmitate.

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

Mansour, Oula C. published the artcileNew Anthracenedione Derivatives with Improved Biological Activity by Virtue of Stable Drug-DNA Adduct Formation, Product Details of C10H18O4, the publication is Journal of Medicinal Chemistry (2010), 53(19), 6851-6866, database is CAplus and MEDLINE.

Mitoxantrone is an anticancer agent that acts as a topoisomerase II poison, however, it can also be activated by formaldehyde to form DNA adducts. Pixantrone, a 2-aza-anthracenedione with terminal primary amino groups in its side chains, forms formaldehyde-mediated adducts with DNA more efficiently than mitoxantrone. Mol. modeling studies indicated that extension of the “linker” region of anthracenedione side arms would allow the terminal primary amino greater flexibility and thus access to the guanine residues on the opposite DNA strand. New derivatives based on the pixantrone and mitoxantrone backbones were synthesized, and these incorporated primary amino groups as well as extended side chains. The stability of DNA adducts increased with increasing side chain length of the derivatives A mitoxantrone derivative bearing extended side chains (I) formed the most stable adducts with ∼100-fold enhanced stability compared to mitoxantrone. This finding is of great interest because long-lived drug-DNA adducts are expected to perturb DNA-dependent functions at all stages of the cell cycle.

Journal of Medicinal Chemistry published new progress about 122110-53-6. 122110-53-6 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ester,Inhibitor, name is (Pivaloyloxy)methyl butyrate, and the molecular formula is C10H18O4, Product Details of C10H18O4.

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

Wipf, Peter published the artcileSynthesis of anti-inflammatory α- and β-linked acetamido pyranosides as inhibitors of toll-like receptor 4 (TLR4), Formula: C14H19NO8, the publication is Tetrahedron Letters (2015), 56(23), 3097-3100, database is CAplus and MEDLINE.

The low-mol.-weight iso-Pr 2-acetamido-α-glucoside I (R = AcO, R¹ = H; (C34)) inhibits toll-like receptor 4 (TLR4) in enterocytes and macrophages in vitro, and reduces systemic inflammation in mouse models of endotoxemia and necrotizing enterocolitis. The authors used a Cu(II)-mediated solvolysis of anomeric oxazolines and an acid-mediated conversion of β-glucosamine- and β-galactosamine pentaacetates to generate analogs of C34 at the anomeric C and at C(4) of the pyranose ring. These compounds were evaluated for their effect on TLR4-mediated inflammatory signaling in cultured enterocytes and monocytes. Their efficacy was confirmed using a NF-κB-luciferase reporter mouse, thus establishing a structure-activity relationship (SAR) study in this series and identifying the more efficacious iso-Pr 2-acetamido-α-galactoside I (R = H, R¹ = AcO).

Tetrahedron Letters published new progress about 10378-06-0. 10378-06-0 belongs to esters-buliding-blocks, auxiliary class Other Aliphatic Heterocyclic,Chiral,Ester,Inhibitor,Inhibitor, name is (3aR,5R,6R,7R,7aR)-5-(Acetoxymethyl)-2-methyl-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]oxazole-6,7-diyl diacetate, and the molecular formula is C4Br2N2O4S, Formula: C14H19NO8.

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

Li, Xingzhen published the artcileThe structure and performance study of PP random impact resistance copolymer, Product Details of C42H63O3P, the publication is Polymer Bulletin (Heidelberg, Germany), database is CAplus.

Four samples, including homopolymerized PP (PP-1), random impact copolymerized PP (PP-2), random impact copolymerized PP of ethylene-propylene (PP-3), and random impact copolymerized PP of ethylene-propylene-butylene (PP-4), which were prepared by 75 KG Spheripol process pilot plant using ZN104M as catalyst, were adopted to study the structure and performance, i.e., the influence of the different polypropylene mol. chain structures on the crystallization behavior of random impact copolymer polypropylene, and the changes in mech. and optical performance due to the different aggregation structures of random impact copolymer polypropylene, and following results were achieved. Firstly, when ethylene-propylene rubber (EPR) and copolymerization monomers of ethylene and butylene were added in turn, the regularity of PP mol. chains decreased in different degree with the order of PP-1 > PP-2 > PP-3 > PP-4, and which further led to the same pattern for the crystallization peak temperature and the crystallinity. Secondly, half-crystallization time (T_1/2) of the same cooling rate and the crystallization activation energy increased with the addition of EPR, ethylene and butylene. Crystallization activation energies were calculated to be 12.05 kJ mol^-1, 12.09 kJ mol^-1, 12.38 kJ mol^-1 and 12.64 kJ mol^-1 for PP-1, PP-2, PP-3 and PP-4, resp. Last but the most importantly, the addition of EPR, ethylene and butylene would enhance the impact strength, but decrease the transmittance, whereas the haze changed little. Based on the theory between structure and performance, the reason that caused above results were analyzed. This work provided some guidance for the development of high-performance polypropylene used in identical fields.

Polymer Bulletin (Heidelberg, Germany) 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 C42H63O3P, Product Details of C42H63O3P.

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

Chen, Hongtai published the artcileNanocage-Based In^III{Tb^III}₂-Organic Framework Featuring Lotus-Shaped Channels for Highly Efficient CO₂ Fixation and I₂ Capture, Application In Synthesis of 1186376-95-3, the publication is ACS Applied Materials & Interfaces (2020), 12(24), 27803-27811, database is CAplus and MEDLINE.

The exquisite combination of independent 3p [In(CO₂)₄] units and 4f [Tb₂(CO₂)₈] clusters in the presence of the designed hexatopic 2,4,6-tri(2,4-dicarboxyphenyl)pyridine ligand engenders one peculiar nanocaged In(III){Tb(III)}₂-organic framework: ({(Me₂NH₂)[InTb₂(HTDP)₂]·3DMF·3H₂O}_n, designated as NUC-5), which features dual types of lotus-shaped channels along the [100] and [110] axes with related node windows of 5.3 × 6.8 and 12.1 × 9.2 Ų, resp. To the best of our knowledge, except several coexisted 3p-4f In/Ln clusters of {In₃Ln}- and {In₃Ln₂}-based metal-organic frameworks (MOFs), NUC-5 is one novel type of In/Ln heterometallic framework. In addition, its topol. was an unprecedented 3D TAYZIC net with a Schlafli symbol of {4.⁴6²}{4.⁵6⁵}₂{4.⁶6.⁸8}. Moreover, activated NUC-5 is proved to be one efficient adsorbent for CO₂ and one recycled cycloaddition catalyst for the transformation of epoxides into related carbonates with high yields under mild conditions. Furthermore, the excellent reversible sorption performance for I₂ in the volatilization phase or in cyclohexane solution with a maximum adsorption capacity of 609.1 mg/g (3.75 iodine mols. per unit cell) makes NUC-5 a promising adsorbent for radioactive products of ¹²⁹I and ¹³¹I in the field of nuclear industry. This study provides one synthetic strategy that the original nature of MOFs could be enhanced by introducing some specific function-prompted inorganic subunits with the aid of predesigned supporting ligands.

ACS Applied Materials & Interfaces published new progress about 1186376-95-3. 1186376-95-3 belongs to esters-buliding-blocks, auxiliary class Boronic acid and ester, name is Dimethyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isophthalate, and the molecular formula is C16H21BO6, Application In Synthesis of 1186376-95-3.

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

Chen, Hongtai published the artcileRobust Heterometallic Tb^III/Mn^II-Organic Framework for CO₂/CH₄ Separation and I₂ Adsorption, Safety of Dimethyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isophthalate, the publication is ACS Applied Nano Materials (2020), 3(3), 2680-2686, database is CAplus.

The exquisite combination of heterometallic [Tb^IIIMn^II(CO₂)₃(H₂O)₂] clusters with the hexacarboxylate ligand of H₆TDP generates one water-stable 3D heterometallic Tb^III/Mn^II-organic framework material {[TbMn(HTDP)(H₂O)₂]·5DMF·4H₂O}_n (NUC–3; H₆TDP = 2,4,6-tri(2′,4′-dicarboxyphenyl)pyridine), which consists of functionalized noninterspersed opening nanochannels shaped by six rows of [Tb^IIIMn^II(CO₂)₃(H₂O)₂] clusters. Based on the single-component sorption measurements, activated NUC–3 framework exhibits effective CO₂/CH₄ separation associated with high uptake and moderate adsorption enthalpy of CO₂. Dynamic breakthrough experiments reveal that NUC–3 could be competent for the separation of CO₂/CH₄ (50:50, v:v) mixture Moreover, the kinetic and equilibrium experiments of iodine adsorption indicate that NUC–3 possess excellent adsorption capacity for iodine mols. in cyclohexane solution The excellent structural stability and functional internal surface makes NUC–3 a prospective adsorbent for practical CO₂/CH₄ separation and adsorption elimination of iodine mols., opening up the insight of heterometallic MOFs for pratical application.

ACS Applied Nano Materials published new progress about 1186376-95-3. 1186376-95-3 belongs to esters-buliding-blocks, auxiliary class Boronic acid and ester, name is Dimethyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isophthalate, and the molecular formula is C16H21BO6, Safety of Dimethyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isophthalate.

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

Chen, Hongtai published the artcileNanoporous Zn^II/Tb^III-Organic Frameworks for CO₂ Conversion, Category: esters-buliding-blocks, the publication is ACS Applied Nano Materials (2020), 3(7), 7201-7210, database is CAplus.

Creative assembly of bimetallic [Zn^IITb^III(CO₂)₃(H₂O)] clusters and the desigened bifunctional ligand of H₆TDP engendered one highly robust anionic heterometallic framework {[(CH₃)₂NH₂][Zn^IITb^III(TDP)(H₂O)]·3DMF·3H₂O}_n (NUC-7), which featured two types of nanochannels decorated with d. open metal sites and free oxygen atoms on the wall. To the best our knowledge, NUC-7 represented one novel kind of heterometallic Zn^II/Ln^III-organic 3D honeycomb MOFs with exposed tetra-coordinated Zn^II-metal sites as Lewis acid sites. Subsequent studies indicated that NUC-7 could highly adsorb CO₂ and catalyze the cycloaddition of various epoxides into related carbonates with the help of cocatalyst TBAB under lukewarm conditions of 1 atm and 80°C. Meanwhile, NUC-7 exhibited the effectively selective sensitivity for discriminating Fe³⁺ in aqueous solution by luminescence quenching. It could be inferred that the excellent characteristics including large void volume, high porosity, active open metal sites, and uncoordinated carboxylate oxygen atoms as Lewis acid and base sites rendered NUC-7 one ideal platform for gas reservoir, specific catalyst, and luminescence sensing.

ACS Applied Nano Materials published new progress about 1186376-95-3. 1186376-95-3 belongs to esters-buliding-blocks, auxiliary class Boronic acid and ester, name is Dimethyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)isophthalate, and the molecular formula is C16H21BO6, Category: esters-buliding-blocks.

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

Huang, Ya Nan published the artcileExternal Stress-Free Reversible Multiple Shape Memory Polymers, Computed Properties of 517-23-7, the publication is ACS Applied Materials & Interfaces (2019), 11(34), 31346-31355, database is CAplus and MEDLINE.

The present work is focused on developing external stress-free two-way triple shape memory polymers (SMPs). Accordingly, a series of innovative approaches are proposed for the material design and preparation Polyurethane prepolymers carrying crystalline polytetrahydrofuran (PTMEG) and poly(ε-caprolactone) (PCL) as the switching phases are resp. synthesized in advance and then crosslinked to produce the target material. The stepwise method is believed to be conducive to manipulation of the relative contribution of PCL and PTMEG. Moreover, the chain extender, 2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-ol (UPy), is incorporated to establish hydrogen bonds among the macromols. By straightforward stretching treatment at different temperatures, the hydrogen bond networks are successfully converted into an internal stress provider, which overcomes the challenge of stress relaxation of the melted low melting temperature polymer (i.e., PTMEG) and increases the efficiency of stress transfer. Meanwhile, the contraction force of the switching phases is tuned to match the internal tensile stress. As a result, the internal stress provider can closely collaborate with melting/recrystallization of the crystalline domains, leading to the repeated multiple shape memory effects. The crosslinked polyurethane is thus able to reversibly morph among three shapes and displays its potentials as soft robot and actuator. The strategy reported here has the advantages of easily accessible raw materials, simple reaction, and facile programing/deprograming/reprograming, so that it possesses wide applicability.

ACS Applied Materials & Interfaces published new progress about 517-23-7. 517-23-7 belongs to esters-buliding-blocks, auxiliary class Tetrahydrofuran,Ketone,Ester, name is 3-Acetyldihydrofuran-2(3H)-one, and the molecular formula is C6H8O3, Computed Properties of 517-23-7.

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