Author: tianli

Li, Yi published the artcileReconfigurable Three-Dimensional Mesotructures of Spatially Programmed Liquid Crystal Elastomers and Their Ferromagnetic Composites, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is reconfigurable mesotructure programmed liquid crystal elastomer ferromagnetic composite.

Reversible programming of 3D soft mesostructures is desired for many applications including soft robotics and biomedical devices. The large, reversible shape changes of liquid crystal elastomers (LCEs), which result from the coupling between the alignment of liquid crystal (LC) mols. and the macroscopic deformation of polymer networks, have attracted much attention for such applications. Here, a facile and versatile strategy is introduced to create reconfigurable, freestanding 3D mesostructures of LCEs and magnetic LCE composites that are inaccessible with existing techniques via spatially programming LC mols. through mech. buckling. Demonstrations include exptl. and theor. results of more than 20 reconfigurable 3D LCE mesostructures of diverse configurations, from coils and spirals to structures that resemble fences and frameworks, with characteristic feature sizes and thicknesses ranging from micro to macro. The large, reversible shape-switching behaviors of these structures over multiple cycles are also demonstrated. An LCE gripper is shown to grab/release objects of both regular and irregular geometries. Furthermore, a robot of ferromagnetic LCE composites that simultaneously responds to magnetic and thermal stimuli for diverse biomimetic behaviors, especially crawling underneath a narrow crack, illustrates the integration of other functional materials to LCEs for multifunctional systems.

Advanced Functional Materials published new progress about Adhesives. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Safety of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Correr-Sobrinho, Lourenco published the artcileStrengthening ceramic surfaces with the use of resin cements based on thiourethane oligomers, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is strengthening ceramic surface resin cement thiourethane oligomer.

This study evaluated the effects of thiourethane (TU) additives on the flexural strength (σf) and elastic modulus (Ef) of a resin cement, and on a possible strengthening of ceramic restorations. Methods : Two TUs (Aromatic and Aliphatic) were added at 0 (control-EC) or 20 wt% to photopolymerizable resin cements. RelyX Ultimate (RU) was the com. control. Flexural strength (σf) and elastic modulus (Ef) of the cements were measured in three-point bending (n = 8). Biaxial flexural strength (σbf) of ceramic disks with and without cement layering were determined using a ball-on-ring setup. The σbf of cement-coated specimens was calculated at positions z = 0 (ceramic surface, bonded interface) and z = -t2 (cement surface above ring). Data were analyzed with one-way ANOVA/Tukey test (α = .05). Results : σf of AR was significantly higher than for AL and RU, and Ef was lower. The Ef of RU was significantly higher than all other groups. At z = 0, all resin-coated groups had higher σbf. The σbf of RU, AR, and AL were significantly higher than EC and unfilled resin group. At z = -t2, RU had significantly higher σbf. Significance : All resin cements were able to strengthen the ceramic, with the TU-modified material presenting similar results to the com. material.

Journal of Applied Polymer Science published new progress about Adhesives. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Gerdt, Philipp published the artcileAlternating Terpolymers through Cyclopolymerization and Subsequent Orthogonal Functionalization, Quality Control of 22483-09-6, the main research area is alternating terpolymer cyclopolymn orthogonal functionalization; Alternating Polymerization; Orthogonal Functionalization; Postmodification; RAFT Polymerization; Radical Polymerization.

A method for the synthesis of functionalized alternating copolymers by reversible deactivation radical polymerization was developed. Copolymerization by reversible addition-fragmentation chain transfer of hexenyl vinyl ether with a novel fluorinated divinyl monomer yields alternating cyclopolymers that can be chemoselectively modified by three distinct orthogonal functionalization reactions. Along the thiol-ene click reaction and amidation, a third functionalization was achieved via NHC-catalyzed transesterification or acylation resulting in a small library of ABC-type alternating terpolymers.

Angewandte Chemie, International Edition published new progress about Acylation. 22483-09-6 belongs to class alcohols-buliding-blocks, name is 2,2-Dimethoxyethanamine, and the molecular formula is C4H11NO2, Quality Control of 22483-09-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Van Damme, Ryan published the artcileChemical reversible crosslinking enables measurement of RNA 3D distances and alternative conformations in cells, Synthetic Route of 110-99-6, the main research area is RNA 3D measurement reversible crosslinking cell conformation.

Three-dimensional (3D) structures dictate the functions of RNA mols. in a wide variety of biol. processes. However, direct determination of RNA 3D structures in vivo is difficult due to their large sizes, conformational heterogeneity, and dynamics. Here we present a method, Spatial 2-Hydroxyl Acylation Reversible Crosslinking (SHARC), which uses chem. crosslinkers of defined lengths to measure distances between nucleotides in cellular RNA. Integrating crosslinking, exonuclease (exo) trimming, proximity ligation, and high throughput sequencing, SHARC enables transcriptome-wide tertiary structure contact maps at high accuracy and precision, revealing heterogeneous RNA structures and interactions. SHARC data provide constraints that improves Rosetta-based RNA 3D structure modeling at near-nanometer resolution Integrating SHARC-exo with other crosslinking-based methods, we discover compact folding of the 7SK RNA, a critical regulator of transcriptional elongation. These results establish a strategy for measuring RNA 3D distances and alternative conformations in their native cellular context.

Nature Communications published new progress about Acylation. 110-99-6 belongs to class alcohols-buliding-blocks, name is 2,2′-Oxydiacetic acid, and the molecular formula is C4H6O5, Synthetic Route of 110-99-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Feng, Mi published the artcileDirect conversion of shrimp shells to O-acylated chitin with antibacterial and anti-tumor effects by natural deep eutectic solvents, Product Details of C4H6O5, the main research area is shrimp shell acylated chitin antibacterial antitumor deep eutectic solvent.

To obtain O-acylated chitin from shrimp shells directly, the used solvent should have multiple functions to remove calcium carbonate, protein, and acylated chitin. Herein, we use the acidic natural deep eutectic solvents (NADESs) with the ability to release H+ and various hydrogen bonding sites to achieve the above goal. The involved NADESs with three abilities of decalcification, deproteinization and acylation replaced acids, alkalis, catalysts, and acylation reagents in the conventional method. The exptl. results revealed that the components of the NADESs, experiment temperature and time played key roles in the purity and degree of substitution (DS) of O-acylated chitin. Meanwhile, the ratio of shrimp shells to NADESs and a small amount of water had little effect on the preparation of O-acylated chitin. With the optimal NADES (choline chloride/DL-malic acid 1 : 2, ChCl 1-DL Mal 2) treatment under the optimal conditions, the purity of O-malate chitin reached 98.6% with a DS of 0.46, exhibiting antibacterial and anti-tumor effects. The exptl. results showed that the removal of calcium carbonate and protein and acylation of chitin were carried out simultaneously. Mechanistic exploration using spectroscopy and experiments confirmed that H+ release from ChCl 1-DL Mal 2 was the main reason for the removal of calcium carbonate and initiation acylation reaction. The protein was degraded to amino acids because of the acidity of ChCl 1-DL Mal 2 and dissolved in the NADES due to hydrogen bonding formation with ChCl 1-DL Mal 2.

Green Chemistry published new progress about Acylation. 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, Product Details of C4H6O5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Mafu, Lubabalo published the artcileSolvent-free synthesis of novel para-menthane-3,8-diol ester derivatives from citronellal using a polymer-supported scandium triflate catalyst, HPLC of Formula: 42822-86-6, the main research area is citronellal para menthane diol ester derivative solvent free synthesis; polymer supported scandium triflate catalyst acylation; PS-Sc(OTf)3; acylation; diesters; para-menthane-3,8-diol.

The use of natural resources as a chem. feedstock for the synthesis of added-value products is gaining interest; as such we report an environmentally friendly method for the synthesis of para-menthane-3,8-diol from natural citronellal oil in 96% yield, under solvent free aqueous conditions. The acylation of para-menthane-3,8-diol with various acid anhydrides over polymer-supported scandium triflate (PS-Sc(OTf)3) catalyst was subsequently developed, where both hydroxy groups of para-menthane-3,8-diol could be simultaneously acylated under mild reaction conditions to form the corresponding diesters in good yields. The advantages of this method include a simple procedure from natural resources, using solvent-free reaction conditions.

Beilstein Journal of Organic Chemistry published new progress about Acylation. 42822-86-6 belongs to class alcohols-buliding-blocks, name is 2-(2-Hydroxypropan-2-yl)-5-methylcyclohexanol, and the molecular formula is C10H20O2, HPLC of Formula: 42822-86-6.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Prathima, P. Sai published the artcileCuI/L-proline-catalyzed selective one-step mono-acylation of styrenes and stilbenes, Quality Control of 92093-23-7, the main research area is monoacylated diol preparation copper proline catalyst; styrene stilbene vicinal dioxygenation copper proline catalyst.

Vicinal di-oxygenation of styrene-type olefins was achieved with cheaper, less toxic CuI in the presence of L-proline as ligand and NaIO4 as the oxidant. This approach provides a straightforward and efficient access to mono-acylated diols from both styrene and stilbene derivatives with good to excellent yields and diastereoselectivity.

Tetrahedron Letters published new progress about Acylation. 92093-23-7 belongs to class alcohols-buliding-blocks, name is 1-(4-Bromophenyl)ethane-1,2-diol, and the molecular formula is C8H9BrO2, Quality Control of 92093-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Qiu, Jiaqi published the artcileRecyclable DMAP-Functionalized polymeric nanoreactors for highly efficient acylation of alcohols in aqueous systems, Synthetic Route of 584-02-1, the main research area is DMAP functionalize block copolymer preparation thermal stability; alc anhydride heterogeneous catalyst acylation green chem; ester preparation.

In this study, small-mol. catalysts 4-(N,N-dimethylamino)pyridine (DMAP) functionalized nanoreactors were constructed by self-assembly of amphiphilic block copolymers with DMAP moieties in the hydrophobic block, leading to heterogeneous catalysts with excellent dispersity in water. The key preparation route included reversible addition-fragmentation chain transfer (RAFT) polymerization of 2-(N-methyl-N-(4-pyridyl)amino)ethyl methacrylate (MAPMA) and Me methacrylate (MMA) using poly (oligomeric (ethylene glycol) Me ether methacrylate) (POEGMA) as a hydrophilic macromol. RAFT reagent. The characterization by dynamic light scattering (DLS) and transmission electron microscopy (TEM) shows that the nanoreactors possess a core-shell nanostructure with the diameter of around 110 nm. The resulting polymeric nanoreactors showed excellent catalytic activity for acylation of alcs. in water. High conversion of a variety of alc. (>99%) and excellent product selectivity were achieved. The high catalytic efficiency of the nanoreactors may be attributed to the enhancement of the interaction between the reactant and the catalyst in the confined hydrophobic space, which simulates how enzymes usually work. Moreover, the catalyst was easily recovered by thermoresponsive separation and reused with high activity for more than 5 cycles. This study presents an efficient approach to achieve green catalytic reactions which were normally incompatible to aqueous conditions, potentially applicable to other catalytic systems such as metal-mediated organic transformations.

Polymer published new progress about Acylation. 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Synthetic Route of 584-02-1.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Hayashi, Hiroyuki published the artcileInsight into the Mechanism of the Acylation of Alcohols with Acid Anhydrides Catalyzed by Phosphoric Acid Derivatives, Recommanded Product: rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol, the main research area is alc acylation carboxylic acid anhydride phosphoric acid derivative catalysis.

Insight into the mechanism of a safe, simple, and inexpensive phosphoric acid (H3PO4)-catalyzed acylation of alcs. with acid anhydrides is described. The corresponding in situ-generated diacylated mixed anhydrides, unlike traditionally proposed monoacylated mixed anhydrides, are proposed as the active species. In particular, the diacylated mixed anhydrides act as efficient catalytic acyl transfer reagents rather than as Bronsted acid catalysts simply activating acid anhydrides. Remarkably, highly efficient phosphoric acid (1-3 mol %)-catalyzed acylation of alcs. with acid anhydrides was achieved and a 23 g scale synthesis of an ester was demonstrated. Also, phosphoric acid catalyst was effective for synthetically useful esterification from carboxylic acids, alcs., and acid anhydride. Moreover, with regard to recent developments in chiral 1,1′-bi-2-naphthol (BINOL)-derived phosphoric acid diester catalysts toward asym. kinetic resolution of alcs. by acylation, some phosphate diesters were examined As a result, a 31P NMR study and a kinetics study strongly supported not only the acid-base cooperative mechanism as previously proposed by other researchers but also the mixed anhydride mechanism as presently proposed by us.

Journal of Organic Chemistry published new progress about Acylation. 124-76-5 belongs to class alcohols-buliding-blocks, name is rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol, and the molecular formula is C10H18O, Recommanded Product: rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Chen, Ling published the artcileHealable and Rearrangeable Networks of Liquid Crystal Elastomers Enabled by Diselenide Bonds, Name: Pentaerythritol tetra(3-mercaptopropionate), the main research area is diselanediylbispropanediyl diacrylate crosslinkable liquid crystal elastomer actuator; diselenide bond; dual-mode programmability; liquid crystal elastomer; rearrangeable LCE network.

Based on liquid crystal elastomer (LCE) materials, hierarchically structured soft actuators can meet some requirements for human-friendly working mode and execute complex tasks with intelligent adaptation to environmental changes. However, few researchers have paid much attention to the preparation methods of multicomponent/hierarchical LCE actuators. The authors demonstrate the successful integration of an exchangeable diselenide chain extender for the preparation of dynamic LCEs, which could be reprogrammed on heating or under visible light illumination. Also, the rearrangeable polydiselenide networks could be applied to develop the self-welding technol. toward fabricating hierarchically structured LCE actuators with sophisticated deformability without using any auxiliary reagent (adhesive, tape, catalysts or initiator) during the assembling process.

Angewandte Chemie, International Edition published new progress about Actuators. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Name: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts