Tag: 100-200

On December 31, 2019, Li, Ting; Zheng, Tian-Ze; Guo, Zhao-Xia; Xu, Jun; Guo, Bao-Hua published an article.Product Details of 517-23-7 The title of the article was A Well-defined Hierarchical Hydrogen Bonding Strategy to Polyureas with Simultaneously Improved Strength and Toughness. And the article contained the following:

A well-defined quadruple hydrogen bonding strategy involving dimerization of 2-ureido-4[1H]-pyrimidone (UPy) units is innovatively designed to prepare polyureas with high overall mech. properties. Three polyureas containing different amounts of UPy units were synthesized by replacing a portion of isophorone diisocyanate (IPDI) with a UPy-derived diisocyanate. The formation of quadruple hydrogen bonds in hard segments via UPy dimers was confirmed by NMR and fourier transform IR spectroscopy. The mech. properties of the polyureas were evaluated by uniaxial tensile testing. Compared to the polyurea without UPy units, remarkable improvements in Young’s modulus, tensile strength, and toughness were simultaneously achieved when UPy units were incorporated. The mechanism behind the strong strengthening effect rooted in the stronger intermol. forces among hard segments brought by the quadruple hydrogen bonds, which were stronger than the inherent bidentate and monodentate hydrogen bonds among urea groups, and the slower soft segmental dynamics revealed by both increased Tg and relaxation time of the soft segments. The mechanism behind the strong toughening effect was ascribed to more effective energy dissipation brought by the quadruple hydrogen bonds that served as stronger sacrificial bonds upon deformation. This work may offer new insight into the design of polyurea elastomers with comprehensively improved mech. properties. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Product Details of 517-23-7

The Article related to polyurea elastomer preparation hierarchical hydrogen bonding mech property, Synthetic Elastomers and Natural Rubber: Elastomer Synthesis and other aspects.Product Details of 517-23-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On June 30, 2022, Ye, Juan; Lin, Guanghong; Lin, Ziqian; Deng, Haoyu; Huang, Junjie; Xiang, Hongping; Rong, Min Zhi; Zhang, Ming Qiu published an article.SDS of cas: 517-23-7 The title of the article was UV-Curable Polyurethane Elastomer with UV-Irradiation/Thermo Dual-Activated Self-Healability. And the article contained the following:

Self-healable polyurethane elastomers have potential applications in many fields, however, their use is limited by single self-healing mechanism, intricate preparation process, and long curing time. Herein, a UV-irradiation/thermo dual-induced self-healing polyurethane elastomer is prepared by UV-curing two kinds of acrylates, where one includes a quadruple hydrogen bond (PU-UPy-HEA) and the other contains a disulfide bond (SS-MA). UV-curing kinetics indicate that the conversion of acrylates is significantly improved by tuning the irradiation intensity, photoinitiator dosage, and SS-MA content. A maximum conversion of 80% is achieved within 10 s under 200 mW cm-2 in the case of the 1.5 weight% photoinitiator. The tensile strength of UV-cured polyurethane elastomer is notably improved by SS-MA, whereas its elongation at break decreases. Tensile shear tests demonstrates that the bisected samples can be re-bonded when they are repaired at 100°C for 15 min, or under 200 mW cm-2 irradiation for 1 h. After that, ∼90% of shear strength is recovered and the strength is only slightly reduced after two healing cycles. Self-healing mainly relies on thermally reversible hydrogen bonding interactions and UV-induced disulfide metathesis. This UV-cured self-healable polyurethane elastomer can be used in smart coatings as well as in other fields. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).SDS of cas: 517-23-7

The Article related to polyurethane elastomer thermo activated self heal ability material, Synthetic Elastomers and Natural Rubber: Elastomer Synthesis and other aspects.SDS of cas: 517-23-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On July 9, 2021, Li, Jian; Niu, Hongyao; Yu, Yingfeng; Gao, Yulei; Wu, Qiang; Wang, Fenfen; Sun, Pingchuan published an article.Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one The title of the article was Supramolecular Polydimethylsiloxane Elastomer with Enhanced Mechanical Properties and Self-Healing Ability Engineered by Synergetic Dynamic Bonds. And the article contained the following:

Hydrophobic elastomers are required for use in industry and daily life because of their versatile properties. Developing a hydrophobic elastomer with self-healing abilities and excellent mech. performance has been very challenging because of the mutually exclusive nature of these properties. Herein, supramol. polydimethylsiloxane (PDMS) elastomers with excellent self-healing and mech. properties were designed through the synergetic combination of multistrength H-bonds and disulfide bonds. The hierarchical H-bonds formed with urethane, urea, and 2-ureido-4[1H]-pyrimidinone (UPy) moieties in the backbone of the supramol. polymer endow the resultant polymers with effective reversible crosslinking, whereas during stretching, the dynamic dissociation and reassociation of H-bonds enable polymers with high extensibility and enhanced toughness and recoverability. In addition, disulfide bond exchange under heat enables polymer network rearrangement, thus imbuing the supramol. elastomer with excellent self-healing ability. Based on the extraordinary properties of hydrophobic supramol. PDMS elastomers, some smart materials can be prepared, such as oil/water separation foams and hydrophobic hot-melt adhesives. Therefore, this concept of synergetic dynamic bonds will point out a direction for the development of sustainable, green, and functional materials of the next generation. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one

The Article related to supramol polydimethylsiloxane elastomer synergetic dynamic bond, Synthetic Elastomers and Natural Rubber: Elastomer Synthesis and other aspects.Application In Synthesis of 3-Acetyldihydrofuran-2(3H)-one

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On January 9, 2020, Wu, Bo; Liu, Zhimeng; Lei, Yuan; Wang, Yi; Liu, Qinfeng; Yuan, Anqian; Zhao, Yuanyang; Zhang, Xi; Lei, Jingxin published an article.Electric Literature of 517-23-7 The title of the article was Mutually-complementary structure design towards highly stretchable elastomers with robust strength and autonomous self-healing property. And the article contained the following:

Achieving good transparency, high strength and superior extensibility simultaneously in autonomic self-healing elastomers remains challenging and fascinating. Herein, a complementary design strategy of combining densely distributed multiple hydrogen bonds and loosely packed spacer units in supramol. elastomer was reported to address the inherent contradiction of robust strength and room temperature self-healing. The chem. structure can be tuned to achieve a good compromise between the mech. properties and self-healing efficiency. The representative elastomers can achieve robust strength (6.81 MPa), high extensibility (2520%) and superior toughness with the dissipated energy up to 63.7 MJ/m3. Moreover, this elastomer is capable of recovering mech. fractures and routine scratches with the self-healing efficiency up to 90%, which are comparable to that of room-temperature self-healable counterparts. Spacer units with steric hindrance effect can facilitate segmental motions and dynamic changes of H-bonds. Meanwhile, the randomly distributed multiple H bonds crosslinking such spacers contribute to the good mech. performance and intriguing self-healing. In contrast to previous reports, this strategy provides an uncomplicated and cost-effective route to prepare robust elastomers that can self-heal at room temperature without any need of external assistance. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Electric Literature of 517-23-7

The Article related to stretchable self healable supramol elastomer hydrogen bonding, Synthetic Elastomers and Natural Rubber: Elastomer Synthesis and other aspects.Electric Literature of 517-23-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On January 18, 2013, Ren, Hong; Wulff, William D. published an article.Application In Synthesis of (R)-Methyl 3-hydroxybutanoate The title of the article was Total Synthesis of Sedum Alkaloids via Catalyst Controlled aza-Cope Rearrangement and Hydroformylation with Formaldehyde. And the article contained the following:

The catalytic asym. aminoallylation of chiral aldehydes is developed as a new method for the catalyst controlled synthesis of syn- and anti-1,3-aminoalcs. This methodol. is highlighted in the synthesis of the sedum alkaloids (+)-sedridine (I) and (+)-allosedridine (II) both of which have their final carbon incorporated during closure of the piperidine ring via a hydroformylation with formaldehyde. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Application In Synthesis of (R)-Methyl 3-hydroxybutanoate

The Article related to enantioselective synthesis sedum alkaloid azo cope rearrangement hydroformation, sedridine allosedridine enantioselective synthesis aminoallylation, Alkaloids: Alkaloids Containing One Nitrogen Atom In A Ring and other aspects.Application In Synthesis of (R)-Methyl 3-hydroxybutanoate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On June 15, 2016, Scott, Andrew E.; Christ, William J.; George, Alison J.; Stokes, Margaret G. M.; Lohman, Gregory J. S.; Guo, Yuhong; Jones, Matthew; Titball, Richard W.; Atkins, Timothy P.; Campbell, A. Stewart; Prior, Joann L. published an article.Safety of (Trimethoxymethyl)benzene The title of the article was Protection against Experimental Melioidosis with a Synthetic manno-Heptopyranose Hexasaccharide Glycoconjugate. And the article contained the following:

Melioidosis is an emerging infectious disease caused by Burkholderia pseudomallei and is associated with high morbidity and mortality rates in endemic areas. Antibiotic treatment is protracted and not always successful; even with appropriate therapy, up to 40% of individuals presenting with melioidosis in Thailand succumb to infection. In these circumstances, an effective vaccine has the potential to have a dramatic impact on both the scale and the severity of disease. Currently, no vaccines are licensed for human use. A leading vaccine candidate is the capsular polysaccharide consisting of a homopolymer of unbranched 1→3 linked 2-O-acetyl-6-deoxy-β-D-manno-heptopyranose. Here, we present the chem. synthesis of this challenging antigen using a novel modular disaccharide assembly approach. The resulting hexasaccharide was coupled to the nontoxic Hc domain of tetanus toxin as a carrier protein to promote recruitment of T-cell help and provide a scaffold for antigen display. Mice immunized with the glycoconjugate developed IgM and IgG responses capable of recognizing native capsule, and were protected against infection with over 120 × LD50 of B. pseudomallei strain K96243. This is the first report of the chem. synthesis of an immunol. relevant and protective hexasaccharide fragment of the capsular polysaccharide of B. pseudomallei and serves as the rational starting point for the development of an effective licensed vaccine for this emerging infectious disease. The experimental process involved the reaction of (Trimethoxymethyl)benzene(cas: 707-07-3).Safety of (Trimethoxymethyl)benzene

The Article related to melioidosis vaccine synthetic burkholderia mannoheptopyranose hexasaccharide glycoconjugate, Immunochemistry: Adjuvants, Antigens, Haptens, and Vaccines and other aspects.Safety of (Trimethoxymethyl)benzene

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On February 26, 2020, Guo, Yinliang; Guo, Zhixian; Lu, Jia-Tian; Fang, Runting; Chen, Si-Cong; Luo, Tuoping published an article.Application In Synthesis of Methyl 2-cyclopentanonecarboxylate The title of the article was Total Synthesis of (-)-Batrachotoxinin A: A Local-Desymmetrization Approach. And the article contained the following:

An enantioselective total synthesis of (-)-batrachotoxinin A is accomplished based on a key photoredox coupling reaction and the subsequent local-desymmetrization operation (I + II → III → IV). After the expedient assembly of the highly oxidized steroid skeleton, a delicate sequence of redox manipulations was carried out to deliver a late-stage intermediate on gram scale-and ultimately (-)-batrachotoxinin A (V) in an efficient manner. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Application In Synthesis of Methyl 2-cyclopentanonecarboxylate

The Article related to batrachotoxinin a enantioselective total synthesis photoredox coupling desymmetrization, Alkaloids: Alkaloids Containing One Nitrogen Atom In A Ring and other aspects.Application In Synthesis of Methyl 2-cyclopentanonecarboxylate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On July 16, 2021, Xu, Yuan-Ze; Wen, Qi-Ling; Sha, Feng; Li, Qiong; Wu, Xin-Yan published an article.COA of Formula: C9H11NO2 The title of the article was Total synthesis of acronycine and noracronycine: An aryne amination approach. And the article contained the following:

Acronycine and noracronycine are chromene-containing alkaloids with significant biol. activity. We have accomplished a concise total synthesis of acronycine and noracronycine. The key step, regioselective nucleophilic addition of anthranilate to chromene-type arynes under mild and transition-metal-free conditions was achieved. In addition, further modifications of nucleophilic addition products, such as hydrogenation, O-functionalization and palladium-catalyzed coupling reactions have also been developed, providing a concise procedure for these alkaloids and their derivatives The experimental process involved the reaction of Methyl N-Methylanthranilate(cas: 85-91-6).COA of Formula: C9H11NO2

The Article related to acronycine synthesis regioselective nucleophilic addition, noracronycine synthesis, Alkaloids: Alkaloids Containing One Nitrogen Atom In A Ring and other aspects.COA of Formula: C9H11NO2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhong, Jiaxin; He, Haibing; Gao, Shuanhu published an article in 2019, the title of the article was Exploration of 1,3-dipolar cycloaddition reactions to construct the core skeleton of Calyciphylline A-type alkaloids.Formula: C7H10O3 And the article contains the following content:

Nitrone induced 1,3-dipolar [3+2] cycloadditions were studied to construct the core structure of Calyciphylline A-type Daphniphyllum alkaloids. This approach is capable of installing the cis-hydroindole A-C ring as well as the spiro-A-C-E ring with the all-carbon quaternary centers at C-5 and C-8, and has been successfully used in the total synthesis of himalensine A. It also lays the foundation for the synthesis of challenging Calyciphylline A-type alkaloids, such as daphniyunnine A. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Formula: C7H10O3

The Article related to calyciphylline a daphniphyllum alkaloid preparation nitrone dipolar cycloaddition, Alkaloids: Alkaloids Containing One Nitrogen Atom In A Ring and other aspects.Formula: C7H10O3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Zhao, Yisheng; Wang, Subo; Wang, Guirong; Li, Hui; Guo, Zhongwu; Gu, Guofeng published an article in 2019, the title of the article was Synthesis and immunological studies of group A Streptococcus cell-wall oligosaccharide-streptococcal C5a peptidase conjugates as bivalent vaccines.Formula: C10H14O3 And the article contains the following content:

Group A Streptococcus (GAS) cell-wall polysaccharides and streptococcal C5a peptidase (ScpA) are identified as potential target antigens for the development of anti-GAS vaccines. Structurally well-defined mono-, di-, and trimers of the trisaccharide repeating unit of the major and conserved cell-wall polysaccharide of various GAS serotypes were synthesized by a convergent and efficient strategy. These synthetic oligosaccharides, which had a free amino group at the reducing end, were conjugated with a novel ScpA mutant ScpA193 protein through the bifunctional glutaryl linker. The resultant neoglycoproteins were evaluated as conjugate vaccines and compared with other glycoconjugates using the common carrier proteins diphtheria toxin mutant CRM197 and tetanus toxoid (TT). Immunol. studies using mice revealed that the ScpA193 conjugates could stimulate not only robust GAS oligosaccharide-specific antibody responses that were comparable to the immunol. activities of CRM197 and TT conjugates but also robust ScpA193-specific antibodies, making the ScpA193-oligosaccharide conjugates promising bivalent anti-GAS vaccine candidates. The experimental process involved the reaction of (Trimethoxymethyl)benzene(cas: 707-07-3).Formula: C10H14O3

The Article related to tetanus crm197 scpa193 streptococcus polysaccharide conjugate vaccine, Immunochemistry: Adjuvants, Antigens, Haptens, and Vaccines and other aspects.Formula: C10H14O3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics