Month: December 2022

Li, Jing published the artcileN-donor ligand supported “”ReO2+””: a pre-catalyst for the deoxydehydration of diols and polyols, Name: 3-Pentanol, the main research area is ligand supported rhenium oxide catalyst diol polyol deoxydehydration.

A selected number of tetradentate N2Py2 ligand-supported ReO2+ complexes and a monodentate pyridine-supported ReO2+ complex have been investigated as catalysts for the deoxydehydration (DODH) of diols and polyols. In situ 1H NMR experiments showed that these N-donor ligand-supported ReO2+ complexes are only the pre-catalyst of the DODH reaction. Treatment of (N2Py2) ReO2+ with an excess amount of water generates an active species for DODH catalysis; use of the Re-product of this reaction shows a much shorter induction period compared to the pristine complex. No ligand is coordinated to the “”water-treated”” complex indicating that the real catalyst is formed after ligand dissociation IR anal. suggested this catalyst to be a rhenium-oxide/hydroxide oligomer. The monodentate pyridine ligand is much easier to dissociate from the metal center than a tetradentate N2Py2 ligand, which makes the Py4ReO2+ -initiated DODH reaction more efficient. For the Py4ReO2+ -initiated DODH of diols and biomass-based polyols, both PPh3 and 3-pentanol could be used as a reductant. Excellent olefin yields are achieved.

Catalysts published new progress about Crystal structure. 584-02-1 belongs to class alcohols-buliding-blocks, name is 3-Pentanol, and the molecular formula is C5H12O, Name: 3-Pentanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Lin, Qianming published the artcileKinetic trapping of 3D-printable cyclodextrin-based poly(pseudo)rotaxane networks, HPLC of Formula: 7575-23-7, the main research area is cyclodextrin polypseudo rotaxane network three dimensional printing.

Synthetically trapping kinetically varied (super)structures of mol. assemblies and amplifying them to the macroscale is a promising, yet challenging, approach for the advancement of meta-stable materials. Here, we demonstrated a concerted kinetic trapping design to timely resolve a set of transient polypseudorotaxanes in solution and harness a crop of them via micro-crystallization By installing stopper or speed bump moieties on the polymer axles, meta-stable polypseudorotaxanes with segmented cyclodextrin blocks were hierarchically amplified into crystalline networks of different crosslinking densities at mesoscale and viscoelastic hydrogels with 3D-printability in bulk. We demonstrated simultaneous 3D-printing of two polypseudorotaxane networks from one reactive ensemble and their conversion to heterogeneous polyrotaxane monoliths. Spatially programming the macroscale shapes of these heterogeneous polyrotaxanes enabled the construction of moisture-responsive actuators, in which the shape morphing originated from the different numbers of cyclodextrins interlocked in these polyrotaxane networks.

Chem published new progress about Crystal structure. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, HPLC of Formula: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Giastas, Petros published the artcileHigh-resolution crystal structure of endoplasmic reticulum aminopeptidase 1 with bound phosphinic transition-state analogue inhibitor, Name: (S)-2-hydroxysuccinic acid, the main research area is endoplasmic reticulum aminopeptidase 1 ERAP1 crystal structure.

Endoplasmic reticulum aminopeptidase 1 (ERAP1) is an intracellular enzyme that helps generate peptides presented by Major Histocompatibility Complex Class I (MHC class I) mols. and is an emerging target for immunotherapy applications. Despite almost two decades of research on ERAP1, lack of high-resolution crystal structures has hampered drug-development efforts. By optimizing the protein construct, we obtained a high-resolution (1.60 Å) crystal structure of the closed-conformation of ERAP1 with a potent phosphinic pseudopeptide inhibitor bound in its active site. The structure provides key insight on the mechanism of inhibition as well as selectivity toward homologous enzymes and allows detailed mapping of the internal cavity of the enzyme that accommodates peptide-substrates. Bis-tris propane and malic acid mols., found bound in pockets in the internal cavity, reveal potential druggable secondary binding sites. The ability to obtain high-resolution crystal structures of ERAP1 removes a major bottleneck in the development of compounds that regulate its activity and will greatly accelerate drug-discovery efforts.

ACS Medicinal Chemistry Letters published new progress about Crystal structure. 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, Name: (S)-2-hydroxysuccinic acid.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Gabrielsson, Jon published the artcileMultivariate Methods in the Development of a New Tablet Formulation: Optimization and Validation, Synthetic Route of 64519-82-0, the main research area is excipient tablet disintegration.

In a previous study of the development of a tablet formulation approx. 100 excipients were characterized in screening experiments using multivariate design. Acceptable values for important responses were obtained with some of the formulations. The relationships between the properties of the excipients and the responses were evaluated using PLS. In this study addnl. experiments were performed in order to validate models obtained from the screening study and to find a formulation of suitable composition with desired tablet properties. A formulation with the desired disintegration time was found with the addnl. experiments and the agreement between observed and predicted values was fair for the tablets that did disintegrate. A limitation of this study was that tablets from four experiments did not disintegrate within the set time limit. The lack of agreement between observed and predicted values of these four experiments was probably due to the nature of one of the factors in the design. Considering the reduced exptl. design the results are still encouraging.

Drug Development and Industrial Pharmacy published new progress about Crushing strength. 64519-82-0 belongs to class alcohols-buliding-blocks, name is (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, and the molecular formula is C12H24O11, Synthetic Route of 64519-82-0.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Bolhuis, Gerad K. published the artcileCompaction properties of isomalt, Name: (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, the main research area is galenIQ 980 800 721 720 lubricant physicochem.

Although other polyols have been described extensively as filler-binders in direct compaction of tablets, the polyol isomalt is rather unknown as pharmaceutical excipient, in spite of its description in all the main pharmacopoeias. In this paper the compaction properties of different types of ispomalt were studied. The types used were the standard product sieved isomalt, milled isomalt and two types of agglomerated isomalt with a different ratio between 6-O-α–glucopyranosyl–sorbitol (GPS) and 1-O-α–glucopyranosyl–mannitol dihydrate (GPM). Powder flow properties, sp. surface area and densities of the different types were investigated. Compactibility was investigated by compression of the tablets on a compaction simulator, simulating the compression on high-speed tabletting machines. Lubricant sensitivity was measured by compressing unlubricated tablets and tablets lubricated with 1% magnesium stearate on an instrumented hydraulic press. Sieved isomalt had excellent flow properties but the compactibility was found to be poor whereas the lubricant sensitivity was high. Milling resulted in both a strong increase in compactibility as an effect of the higher surface area for bonding and a decrease in lubricant sensitivity as an effect of the higher surface area to be coated with magnesium stearate. However, the flow properties of milled isomalt were too bad for use as filler-binder in direct compaction. Just as could be expected, agglomeration of milled isomalt by fluid bed agglomeration improved flowability. The good compaction properties and the low lubricant sensitivity were maintained. This effect is caused by an early fragmentation of the agglomerated material during the compaction process, producing clean, lubricant-free particles and a high surface for bonding. The different GPS/GPM ratios of the agglomerated isomalt types studied had no significant effect on the compaction properties.

European Journal of Pharmaceutics and Biopharmaceutics published new progress about Crushing strength. 64519-82-0 belongs to class alcohols-buliding-blocks, name is (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, and the molecular formula is C12H24O11, Name: (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Acosta Ortiz, Ricardo published the artcileSimultaneous reduction in situ and thiol- functionalization of Graphene Oxide during the Photopolymerization of Epoxy/Thiol-ene photocurable systems to prepare polyether-polythioether/reduced graphene oxide nanocomposites, Computed Properties of 7575-23-7, the main research area is photopolymerization polyether polythioether reduced graphene oxide nanocomposite.

An efficient method is reported to prepare photocurable polyether-polythioether/reduced graphene oxide (rGO) composites. XPS, energy dispersive X-ray spectroscopy and Raman spectroscopies were used to verify that graphene oxide (GO) was concurrently reduced and functionalized with thiol groups during the photopolymerization of an epoxy/thiol-ene system. The thiol groups introduced to GO during the photo-thermal treatment allowed the covalent bonding of rGO to the polymeric matrix thereby increasing the toughness and mech. properties of the composites despite the reduced crosslink d., in comparison with a control sample without rGO.

Polymer-Plastics Technology and Materials published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Reisinger, David published the artcileIntroduction of Photolatent Bases for Locally Controlling Dynamic Exchange Reactions in Thermo-Activated Vitrimers, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is photolatent base dynamic exchange thermoactivated vitrimer epoxy crosslinking; photoactivation vitrimer transesterification catalyst epoxy thiol; materials science; photochemistry; photolatent base; polymers; vitrimer.

Vitrimers exhibit a covalently crosslinked network structure, as is characteristic of classic thermosetting polymers. However, they are capable of rearranging their network topol. by thermo-activated associative exchange reactions when the topol. freezing transition temperature (Tv) is exceeded. Despite the vast number of developed vitrimers, there is a serious lack of methods that enable a (spatially) controlled onset of these rearrangement reactions above Tv. Herein, we highlight the localized release of the efficient transesterification catalyst 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) by the UV-induced cleavage of a photolatent base within a covalently crosslinked thiol-epoxy network. Demonstrated with stress relaxation measurements conducted well above the network’s Tv, only the controlled release of TBD facilitates the immediate onset of transesterification in terms of a viscoelastic flow. Moreover, the spatially resolved UV-mediated photoactivation of vitrimeric properties is confirmed by permanent shape changes induced locally in the material.

Angewandte Chemie, International Edition published new progress about Crosslink density. 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

Li, Wenbin published the artcileThermal-induced self-healing bio-based vitrimers: Shape memory, recyclability, degradation, and intrinsic flame retardancy, COA of Formula: C17H28O8S4, the main research area is shape memory vitrimer intrinsic flame retardancy.

The structure of epoxy resin determines its flammable property, non-reprocessing, unrecyclable, and nondegradable, which limits their application. Thus, a novel disulfide bond-containing dynamic covalent thiol-ene crosslinked epoxy vitrimers (TECEVs) as covalently adaptable networks were synthesized. Also, the structure-property relationship of polymeric compounds was investigated. The insoluble vitrimers networks demonstrated faster stress relaxation with 107 s at 200°, and obtained lower activation energy between 70.52 and 110.57 kJ·mol-1. In addition, the dynamic nature of the disulfide bond allowed the damaged TECEVs to be thermal-induced self-repairing and self-healing materials with efficiencies 100% at 160°. It was discovered that TECEVs can be reprocessed at 160° with the recovery of mech. strength above 80% and be completely decomposed in an ethanol-acid catalyst solution Moreover, typical TECEVs can function with excellent flame retardancy and illustrated a high limit oxygen index (LOI, 27.45-28.36%), and UL-94 V-0 rating was achieved. This work could provide an efficient strategy for the synthesis of “”biobased self-repairing flame retardant”” networks and contribute to the development of high-performance sustainable polymers.

Polymer Degradation and Stability published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, COA of Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ge, Meiying published the artcileBuilding biobased, degradable, flexible polymer networks from vanillin via thiol-ene “”click”” photopolymerization, Application In Synthesis of 7575-23-7, the main research area is thiol ene click photopolymerization flexible polymer network preparation.

Research on biobased degradable flexible polymers with high transparency and outstanding mech. performance is of great importance for the rapid and sustainable development of flexible devices. Herein, renewable vanillin was chosen to synthesize a biobased allyl ether monomer (BAMTU) with high aromaticity and degradable acetal groups. BAMTU and thiol with different functionalities were then polymerized through thiol-ene “”click”” photopolymerization to form three kinds of thiol-ene networks (BAMTU-SH) with tunable properties. Their glass transition temperatures ranged from 20 to 49°, their tensile strength and elongation at break were 2.9-18.2 MPa and 103.5-305.6%, resp. BAMTU-SH4 showed the best integrated mech. performance, for which the toughness was the highest (14.5 MPa). These BAMTU-SH networks exhibited high transparency with a transmittance of 89.4-90.5% at 550 nm. Moreover, all of them could be degraded in mild acetic acid solution The high-performance BAMTU-SH networks have potential applications in flexible device substrates while their degradability will contribute to environmental protection.

Polymer Chemistry published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application In Synthesis of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ohzono, Takuya published the artcileInternal constraints and arrested relaxation in main-chain nematic elastomers, Synthetic Route of 7575-23-7, the main research area is nematic liquid crystal elastomer mech optical property.

Nematic liquid crystal elastomers (N-LCE) exhibit intriguing mech. properties, such as reversible actuation and soft elasticity, which manifests as a wide plateau of low nearly-constant stress upon stretching. N-LCE also have a characteristically slow stress relaxation, which sometimes prevents their shape recovery. To understand how the inherent nematic order retards and arrests the equilibration, here we examine hysteretic stress-strain characteristics in a series of specifically designed main-chain N-LCE, investigating both macroscopic mech. properties and the microscopic nematic director distribution under applied strains. The hysteretic features are attributed to the dynamics of thermodynamically unfavored hairpins, the sharp folds on anisotropic polymer strands, the creation and transition of which are restricted by the nematic order. These findings provide a new avenue for tuning the hysteretic nature of N-LCE at both macro- and microscopic levels via different designs of polymer networks, toward materials with highly nonlinear mech. properties and shape-memory applications.

Nature Communications published new progress about Crosslink density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts