Day: November 21, 2022

Tabuchi, Atsuko published the artcileSynthesis and Characterization of White-Light Luminescent End-Capped Polyimides Based on FRET and Excited State Intramolecular Proton Transfer, Application of 4,4-Diaminodicyclohexyl methane, the publication is Polymers (Basel, Switzerland) (2021), 13(22), 4050, database is CAplus and MEDLINE.

N-cyclohexylphthalimide-substituted trifluoroacetylamino (CF₃CONH-) group (3TfAPI), which forms an intramol. hydrogen bond, was synthesized, and it exhibited a bright yellow fluorescence owing to the excited-state intramol. proton transfer (ESIPT) in the solution and crystalline states. In addition, CF₃CONH-substituted phthalic anhydride (3TfAPA) was synthesized, which was attached to the termini of a blue-fluorescent semi-aromatic polyimide (PI) chain. Owing to the efficient Forster resonance energy transfer (FRET) occurring from the main chain to the termini and the suppression of deprotonation (anion formation) at the 3TfAPA moiety by H₂SO₄ doping, the resulting PI films display bright white fluorescence. Moreover, the enhancement of the chain rigidity by substituting the diamine moiety results in an increase in the quantum yield of white fluorescence (Φ) by a factor of 1.7, due to the suppression of local mol. motion. This material design strategy is promising for preparing thermally stable white-light fluorescent PIs applicable to solar spectral converters, displays, and ICT devices.

Polymers (Basel, Switzerland) published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C9H7NO2, Application of 4,4-Diaminodicyclohexyl methane.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Giuntoli, Andrea published the artcileSystematic coarse-graining of epoxy resins with machine learning-informed energy renormalization, COA of Formula: C13H26N2, the publication is npj Computational Materials (2021), 7(1), 168, database is CAplus and MEDLINE.

Abstract: A persistent challenge in mol. modeling of thermoset polymers is capturing the effects of chem. composition and degree of crosslinking (DC) on dynamical and mech. properties with high computational efficiency. We established a coarse-graining (CG) approach combining the energy renormalization method with Gaussian process surrogate models of mol. dynamics simulations. This allows a machine-learning informed functional calibration of DC-dependent CG force field parameters. Taking versatile epoxy resins consisting of Bisphenol A diglycidyl ether combined with curing agent of either 4,4-Diaminodicyclohexylmethane or polyoxypropylene diamines, we demonstrated excellent agreement between all-atom and CG predictions for d., Debye-Waller factor, Young’s modulus, and yield stress at any DC. We further introduced a surrogate model-enabled simplification of the functional forms of 14 non-bonded calibration parameters by quantifying the uncertainty of a candidate set of calibration functions. The framework established provides an efficient methodol. for chem.-specific, large-scale investigations of the dynamics and mechanics of epoxy resins.

npj Computational Materials published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, COA of Formula: C13H26N2.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Luo, Qiang published the artcileThe thiolated chitosan: Synthesis, gelling and antibacterial capability, Quality Control of 162515-68-6, the publication is International Journal of Biological Macromolecules (2019), 521-530, database is CAplus and MEDLINE.

Chitosan-1-(mercaptomethyl)-cyclopropane acetic acid (CS-MCA) copolymer was synthesized by amino linkage. The obtained copolymer was characterized by FTIR, ¹H NMR, XRD, TGA and SEM. Porous and reticulate morphologies were found on the CS-MCA surface. The effects of pH on the rheol. properties of CS-MCA were investigated. On the one hand, the apparent viscosity of CS-MCA indicated a shear-thinning behavior. The graft of MCA enhanced the moduli and the maximum elastic properties were observed at pH = 7.00. The addition of dithiothreitol reduced the viscosity and modulus of CS-MCA hydrogel, and the gelation time, temperature and frequency were obtained in dynamic oscillatory tests. The antibacterial effect of CS-MCA against E. coli was investigated for the inhibition zone and bacterial growth curve. These results showed that CS-MCA had better antibacterial ability than chitosan without modification. Therefore, the rheol. behavior and functional activities can be applied for the hydrocolloid gels in food and pharmaceutical applications.

International Journal of Biological Macromolecules published new progress about 162515-68-6. 162515-68-6 belongs to quinuclidine, auxiliary class Thiol,Carboxylic acid,Aliphatic cyclic hydrocarbon, name is 2-(1-(Mercaptomethyl)cyclopropyl)acetic acid, and the molecular formula is C6H10O2S, Quality Control of 162515-68-6.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Cao, Junya published the artcileRu/g-C₃N₄ as an efficient catalyst for selective hydrogenation of aromatic diamines to alicyclic diamines, Synthetic Route of 1761-71-3, the publication is RSC Advances (2020), 10(28), 16515-16525, database is CAplus and MEDLINE.

A series of Ru/g-C₃N₄ materials with highly dispersed Ru were firstly prepared by an ultrasonic impregnation method using carbon nitride as a support. The catalysts were characterized by various techniques including BET and elemental anal., ICP-AES, XPS, XRD, CO₂-TPD and TEM. The results demonstrated that Ru/g-C₃N₄ materials with a mesoporous structure and highly dispersed Ru were successfully prepared The chemo-selective hydrogenation of p-phenylenediamine (PPDA) to 1,4-cyclohexanediamine (CHDA) over Ru/g-C₃N₄ as a model reaction was investigated in detail. PPDA conversion of 100% with a CHDA selectivity of more than 86% could be achieved under mild conditions. It can be inferred that the carbon nitride support possessed abundant basic sites and the Ru/g-C₃N₄-T catalysts provided suitable basicity for the aromatic ring hydrogenation. Compared to the N-free Ru/C catalyst, the involvement of nitrogen species in Ru/g-C₃N₄ remarkably improved the catalytic performance. In addition, the recyclability of the catalyst demonstrated that the aggregation of Ru nanoparticles was responsible for the decrease of the catalytic activity. Furthermore, this strategy also could be expanded to the selective hydrogenation of other aromatic diamines to alicyclic diamines.

RSC Advances published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C13H26N2, Synthetic Route of 1761-71-3.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Deshpande, Swapneel R. published the artcileBiomimetic stress sensitive hydrogel controlled by DNA nanoswitches, Name: Dbco-acid, the publication is Biomacromolecules (2017), 18(10), 3310-3317, database is CAplus and MEDLINE.

One of the most intriguing and important aspects of biol. supramol. materials is its ability to adapt macroscopic properties in response to environmental cues for controlling cellular processes. Recently, bulk matrix stiffness, in particular, stress sensitivity, has been established as a key mech. cue in cellular function and development. However, stress-stiffening capacity and the ability to control and exploit this key characteristic is relatively new to the field of biomimetic materials. In this work, DNA-responsive hydrogels, composed of semiflexible PIC polymers equipped with DNA cross-linkers, were engineered to create mimics of natural biopolymer networks that capture these essential elastic properties and can be controlled by external stimuli. We show that the elastic properties are governed by the mol. structure of the cross-linker, which can be readily varied providing access to a broad range of highly tunable soft hydrogels with diverse stress-stiffening regimes. By using cross-linkers based on DNA nanoswitches, responsive to pH or ligands, internal control elements of mech. properties are implemented that allow for dynamic control of elastic properties with high specificity. The work broadens the current knowledge necessary for the development of user defined biomimetic materials with stress stiffening capacity.

Biomacromolecules published new progress about 1353016-70-2. 1353016-70-2 belongs to quinuclidine, auxiliary class Other Aromatic Heterocyclic,Carboxylic acid,Amide,Inhibitor,Inhibitor, name is Dbco-acid, and the molecular formula is C19H15NO3, Name: Dbco-acid.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Taplan, Christian published the artcileCovalent Adaptable Networks Using β-Amino Esters as Thermally Reversible Building Blocks, Quality Control of 1761-71-3, the publication is Journal of the American Chemical Society (2021), 143(24), 9140-9150, database is CAplus and MEDLINE.

In this study, β-amino esters, prepared by the aza-Michael addition of an amine to an acrylate moiety, are investigated as building blocks for the formation of dynamic covalent networks. While such amino esters are usually considered as thermally nondynamic adducts, the kinetic model studies presented here show that dynamic covalent exchange occurs via both dynamic aza-Michael reaction and catalyst-free transesterification. This knowledge is transferred to create β-amino ester-based covalent adaptable networks (CANs) with coexisting dissociative and associative covalent dynamic exchange reactions. The ease, robustness, and versatility of this chem. are demonstrated by using a variety of readily available multifunctional acrylates and amines. The presented CANs are reprocessed via either a dynamic aza-Michael reaction or a catalyst-free transesterification in the presence of hydroxyl moieties. This results in reprocessable, densely crosslinked materials with a glass transition temperature (T_g) ranging from -60 to 90°C. Moreover, even for the low T_g materials, a high creep resistance was demonstrated at elevated temperatures up to 80°C. When addnl. β-hydroxyl group-containing building blocks are applied during the network design, an enhanced neighboring group participation effect allows reprocessing of materials up to 10 times at 150°C within 30 min while maintaining their material properties.

Journal of the American Chemical Society published new progress about 1761-71-3. 1761-71-3 belongs to quinuclidine, auxiliary class Ploymers, name is 4,4-Diaminodicyclohexyl methane, and the molecular formula is C10H9NO4S, Quality Control of 1761-71-3.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Chen, Mao published the artcileLiving Additive Manufacturing: Transformation of Parent Gels into Diversely Functionalized Daughter Gels Made Possible by Visible Light Photoredox Catalysis, Computed Properties of 1353016-70-2, the publication is ACS Central Science (2017), 3(2), 124-134, database is CAplus and MEDLINE.

Existing light-initiated additive manufacturing techniques typically rely on layer-by-layer addition or continuous extraction of polymers formed via nonliving, free radical polymerization methods. This approach renders the final materials “dead” toward further monomer insertion; the chains within the final material cannot be reactivated to further induce material growth. An alternative approach to photocontrolled additive manufacturing would involve repeated spatiotemporal insertion of new monomers into a preformed “parent” material to generate more complex and diversely functionalized “daughter” materials. Such an approach would require the development of a photocontrolled polymerization capable of insertion of new functionality directly into a polymer network with living strands. Here, we demonstrate a proof-of-concept study of this living additive manufacturing concept using end-linked polymer networks with embedded trithiocarbonate iniferters that can be activated in the presence of visible light and an organic photoredox catalyst (10-phenylphenothiazine) to achieve controlled insertion of monomers and crosslinkers within the network strands. This system enables, for the first time, the synthesis of a wide range of chem. and mech. differentiated daughter gels from a single parent material via precise modification of the average chain length, crosslinking d., and composition of polymer networks. For example, daughter gels that are softer than their parent, stiffer than their parent, larger but with exactly the same modulus as their parent, thermally responsive, polarity responsive, healable, and weldable are all realized.

ACS Central Science published new progress about 1353016-70-2. 1353016-70-2 belongs to quinuclidine, auxiliary class Other Aromatic Heterocyclic,Carboxylic acid,Amide,Inhibitor,Inhibitor, name is Dbco-acid, and the molecular formula is C19H15NO3, Computed Properties of 1353016-70-2.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Chervonova, U. V. published the artcileSynthesis and phase behavior of branched esters derived from cyclohexylbenzoic acid, Application of 4-Cyclohexylbenzoic acid, the publication is Russian Journal of General Chemistry (2011), 81(11), 2288-2293, database is CAplus.

A branched aldehyde on the basis of cyclohexylbenzoates and 3,5-dihydroxybenzoates was synthesized. For the characteristic of intermediates and the target substance TLC, elemental anal., IR, NMR spectroscopy, and differential scanning calorimetry were used. It was found that at the increase in length and branching degree of aldehyde the final product acquires the tendency to transfer to the glassy state.

Russian Journal of General Chemistry published new progress about 20029-52-1. 20029-52-1 belongs to quinuclidine, auxiliary class Carboxylic acid,Benzene, name is 4-Cyclohexylbenzoic acid, and the molecular formula is C13H16O2, Application of 4-Cyclohexylbenzoic acid.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Probst, Nicolas published the artcileIntramolecular Pd-Catalyzed Anomeric C(sp³)-H Activation of Glycosyl Carboxamides, Related Products of quinuclidine, the publication is Organic Letters (2017), 19(19), 5038-5041, database is CAplus and MEDLINE.

An expedient method for the synthesis of fused glycosylquinolin-2-ones and glycosylspirooxindoles through an unprecedented intramol. Pd-catalyzed anomeric C-H activation of the sugar moiety of 2-bromophenyl glycosylcarboxamides is reported. The scope of the reaction is broad and tolerates a wide range of functional groups.

Organic Letters published new progress about 1160556-64-8. 1160556-64-8 belongs to quinuclidine, auxiliary class Mono-phosphine Ligands, name is 2′-(Dicyclohexylphosphino)-N2,N2,N6,N6-tetramethyl-[1,1′-biphenyl]-2,6-diamine, and the molecular formula is C28H41N2P, Related Products of quinuclidine.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider

Coombs, John R. published the artcileAdvances in Base-Metal Catalysis: Development of a Screening Platform for Nickel-Catalyzed Borylations of Aryl (Pseudo)halides with B₂(OH)₄, Safety of 2′-(Dicyclohexylphosphino)-N2,N2,N6,N6-tetramethyl-[1,1′-biphenyl]-2,6-diamine, the publication is Organometallics (2019), 38(1), 157-166, database is CAplus.

Investigations into nickel-catalyzed borylation reactions have led to the development of an exptl. design of 24 reaction conditions for rapid lead identification. A case study on the borylation of a model aryl bromide with B₂(OH)₄ prompted a series of mechanistic and stability studies to better understand the catalytic cycle and factors that affect robustness. HTEx was employed to study the effect of a series of scavengers on the remediation of nickel from the reaction stream. These combined results have generated an increased understanding of nickel-catalyzed borylation reactions and set the stage for their expanded use in process chem.

Organometallics published new progress about 1160556-64-8. 1160556-64-8 belongs to quinuclidine, auxiliary class Mono-phosphine Ligands, name is 2′-(Dicyclohexylphosphino)-N2,N2,N6,N6-tetramethyl-[1,1′-biphenyl]-2,6-diamine, and the molecular formula is C28H41N2P, Safety of 2′-(Dicyclohexylphosphino)-N2,N2,N6,N6-tetramethyl-[1,1′-biphenyl]-2,6-diamine.

Referemce:
https://en.wikipedia.org/wiki/Quinuclidine,
Quinuclidine | C7H13N | ChemSpider