Tag: 100-200

On February 16, 2011, Espeel, Pieter; Goethals, Fabienne; Du Prez, Filip E. published an article.HPLC of Formula: 6038-19-3 The title of the article was One-Pot Multistep Reactions Based on Thiolactones: Extending the Realm of Thiol-Ene Chemistry in Polymer Synthesis. And the article contained the following:

The in situ generation of thiols by nucleophilic ring-opening of a thiolactone with amines, followed by a UV-initiated radical thiol-ene reaction in a one-pot fashion, has been evaluated as an accelerated and versatile protocol for the synthesis of several types of polymeric architectures. After elaboration of a model amine-thiol-ene conjugation reaction, a number of routes based on readily available thiolactone-containing structures have been developed to successfully assemble functional, linear polymers and networks via a mild and facile radical photopolymerization process. The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).HPLC of Formula: 6038-19-3

The Article related to nucleophilic ring opening poly thiolactone polysulfide polyurethane, Chemistry of Synthetic High Polymers: Ring-Opening and Other Polymerizations and other aspects.HPLC of Formula: 6038-19-3

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

On September 16, 2021, Xie, Haopu; Liu, Xiangdong; Sheng, Dekun; Wu, Haohao; Zhou, Yan; Tian, Xinxin; Sun, Yinglu; Shi, Biru; Yang, Yuming published an article.Synthetic Route of 517-23-7 The title of the article was Novel titin-inspired high-performance polyurethanes with self-healing and recyclable capacities based on dual dynamic network. And the article contained the following:

It is still a huge challenge that integrating excellent mech. performance and high healing efficiency into self-healing materials at the same time, even if numerous dynamic bonds have been explored in preparing of self-healing materials in the last 20 years. Herein, we reported a novel titin-inspired strategy to prepare the polyurethanes via introducing dual dynamic network which contained the phys. crosslinking of quadruple hydrogen bonds formed by 5-(2-hydroxyethyl)-6-methyl-2-aminouracil (UPy) dimers and the covalent crosslinking of Diels-Alder (D-A) bonds. Specially, relying on the synergistic effect of the dual dynamic network, the resulting polyurethane F50U50-PU exhibited admirable mech. performance, such as a super-high strength of 51.9 MPa, a superb toughness of 166.7 MJ/m3 and a large elongation at break of 930%. Meanwhile, on account of the dynamic feature of quadruple hydrogen bonds and D-A bonds, the resulting polyurethane showed a high heat-induced healing efficiency of 91.2%. More importantly, the polyurethanes could be recycled by hot-pressing process to regain their initial mech. properties and integrity. And it was also used as substrate to construct self-healing conductive device, which displayed splendid self-healing of elec. conductivity after damage. It can be envisioned that the polyurethanes with both superior mech. performance and high healing efficiencies have great application prospect in multifarious fields. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Synthetic Route of 517-23-7

The Article related to polyurethane dual dynamic network self healing recyclable capacity, Plastics Manufacture and Processing: Physical Properties and Testing Methods and other aspects.Synthetic Route of 517-23-7

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

Tavana, Jalal; Faysal, Atik; Vithanage, Anushka; Gramlich, William M.; Schwartz, Thomas J. published an article in 2022, the title of the article was Pathway to fully-renewable biobased polyesters derived from HMF and phenols.Category: esters-buliding-blocks And the article contains the following content:

Building on previous work where 5-hydroxymethylfurfural (HMF) was selectively functionalized by etherification with phenols, we demonstrated that the oxidized versions of these HMF ethers can be converted to functionalized δ-hexalactones (FDHLs) that can subsequently undergo ring-opening polymerization (ROP) to form polyesters. The key step in FDHL production is Ru-catalyzed selective hydrogenolysis of the C-O bond of functionalized-2-furan carboxylic acids (FFCAs). We found that the combination of a TiO2 support and a polar, aprotic solvent leads to high selectivity toward the lactone product. Under the optimized conditions, we achieved a 60% yield of FDHL at 150°C with 1.5% Ru/TiO2 in 1,4-dioxane using 5-phenoxy-2-furan carboxylic acid as a model reactant. ROP of six-membered lactone monomers bearing either a methoxy (MDHL) or a phenolic (PDHL) pendant group resulted in polymers ranging from 5 to 30 kg mol-1 with narrow dispersity. The polymerizations were carried out at room temperature using di-Ph phosphate (DPP) and triazabicyclodecene (TBD) as organocatalysts. Typical equilibrium polymerization behavior was observed at room temperature, and the reaction was observed to be pseudo-first order with respect to monomer concentration in solution Poly(PDHL) had a significantly higher glass transition temperature (6°C) than unsubstituted poly(valerolactone) due to the presence of the bulky phenolic group off the polymer backbone. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Category: esters-buliding-blocks

The Article related to hmf phenol renewable biobased polyester preparation rop catalyst, Chemistry of Synthetic High Polymers: Ring-Opening and Other Polymerizations and other aspects.Category: esters-buliding-blocks

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

On September 30, 2016, Resetco, Cristina; Frank, Daniel; Dikic, Tamara; Claessens, Sven; Verbrugge, Tom; Du Prez, Filip E. published an article.Product Details of 6038-19-3 The title of the article was Thiolactone-based polymers for formaldehyde scavenging coatings. And the article contained the following:

A novel, straightforward chem. platform to prepare polymers with covalently bound amine functional groups has been developed for applications as coatings that scavenge formaldehyde emissions. For the polymer preparation, an amine-thiol-ene conjugation process was used to combine N-(allyloxy)carbonyl homocysteine thiolactone monomer with different amines, which simultaneously released a thiol group for subsequent thiol-ene radical polymerization Results of the European standard formaldehyde release test by the flask method indicated that the obtained polymers with higher amine loadings resulted in a greater reduction in formaldehyde concentration Urea-formaldehyde adhesive was overcoated with scavenging polymers, which resulted in a significant reduction in formaldehyde emissions. The amine-functionalized polymers were characterized by NMR and DSC before and after exposure to formaldehyde. After exposure to formaldehyde, polymers exhibited addnl. proton peaks in the NMR spectra and their glass transition temperature increased, which implied that formaldehyde was bound to the polymers. The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).Product Details of 6038-19-3

The Article related to thiolactone polymer formaldehyde scavenging coating scavenger, Chemistry of Synthetic High Polymers: Ring-Opening and Other Polymerizations and other aspects.Product Details of 6038-19-3

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

Maczka, Wanda; Winska, Katarzyna; Grabarczyk, Malgorzata; Zarowska, Barbara published an article in 2018, the title of the article was Biotransformation of α-acetylbutyrolactone in Rhodotorula strains.Quality Control of 3-Acetyldihydrofuran-2(3H)-one And the article contains the following content:

Due to its structural similarity, the α-1-hydroxyethyl-γ-butyrolactone obtained by reduction of (±)-α-acetyl-γ-butyrolactone may have a similar function in the body to γ-butyrolactone (GBL). In the work presented, biotransformation of α-acetyl-γ-butyrolactone by three Rhodotorula strains was performed obtaining enantiomerically enriched alc. The process was carried out in growing and resting cultures. We studied how both media composition and organic solvent volume affected stereoselectivity and effectiveness of biotransformation. After 2 h, the enantiomerically pure (3R, 1 S)-α-1-hydroxyethyl-γ-butyrolactone was obtained using the R. marina AM77 strain in YPG (Yeast extract-Peptone-Glucose) medium enriched with 5% glycerol. To our best knowledge there is no previous information in the literature about the (±)-α-acetyl-γ-butyrolactone biotransformation performed in medium with addition of organic and deep eutectic solvents. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Quality Control of 3-Acetyldihydrofuran-2(3H)-one

The Article related to rhodotorula biotransformation alpha acetyl gamma butyrolactone, des, biotransformation, glycerol, lactone, yeast, Microbial, Algal, and Fungal Biochemistry: Metabolism and Microbial Nutrition and other aspects.Quality Control of 3-Acetyldihydrofuran-2(3H)-one

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

On February 20, 2004, Creary, Xavier; Burtch, Elizabeth A. published an article.COA of Formula: C7H14O3 The title of the article was Remarkably Facile Solvolyses of Triflates via Carbocationic Processes in Dimethyl Sulfoxide. And the article contained the following:

A number of triflates have been shown to undergo clean pseudo-first-order solvolysis reactions in DMSO-d6 to give products derived from carbocationic intermediates. Thus, t-BuCH(OTf)CO-t-Bu (5) and t-BuCH2OTf (9) react readily in DMSO-d6 at 25 °C to give a rearranged oxosulfonium salts, and subsequent alkene products where Me migration to the incipient cationic center occurs. t-BuCH(OTf)CO2CH3 (14) gives analogous rearranged products, and 1-methylcyclopropyl triflate (21) gives a ring-opened allylic oxosulfonium salt. These triflates react primarily via kΔ pathways. 6-Methylbicyclo[3.1.0]hex-6-yl triflate (23), bicyclo[2.2.1]hept-1-yl triflate (24), 1,6-methano[10]annulen-11-yl triflate (25), (CH3)2C(OTf)CO2CH3 (26), and (CH3)2CCN(OTf) (29) all react in DMSO-d6 to give carbocation-derived products. PhCH(OTf)CF3 (33) and substituted analogs also react readily in DMSO-d6, and the Hammett ρ+ value is -3.7. This suggests a “borderline” mechanism where the transition state has substantial charge development. The primary feature of these solvolyses is the high reactivity of all of these triflates in DMSO-d6. Thus, these triflates are all more reactive in DMSO-d6 than in HOAc, and for most, rates are faster than in CF3CH2OH. Triflates 5, 21, 29, and 33 are 108-109 times more reactive in DMSO-d6 than the corresponding mesylates. It is suggested that the decreased need for electrophilic solvation of triflate anion, and the high cation solvating ability of DMSO, are the reasons for the high triflate reactivity in DMSO-d6. The experimental process involved the reaction of Methyl 2-hydroxy-3,3-dimethylbutanoate(cas: 121129-31-5).COA of Formula: C7H14O3

The Article related to facile solvolysis triflate carbocation intermediate dimethyl sulfoxide solvent effect, Physical Organic Chemistry: Addition, Elimination, and Substitution Reactions and other aspects.COA of Formula: C7H14O3

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

Zhao, Baoli published an article in 2012, the title of the article was Pd-Catalyzed C-3 functionalization of indolizines via C-H bond cleavage.Product Details of 93476-46-1 And the article contains the following content:

New transition metal-catalyzed methods for the arylation of indolizines by the direct cleavage of C-H bonds have been developed. A wide range of aryltrifluoroborate salts react with indolizines in the presence of Pd(OAc)2 catalyst and AgOAc oxidant to give the arylated indolizines in high yields. Both electron-donating and electron-withdrawing groups perform smoothly while bromide and chlorine substituents are tolerated. In addition, the indolizines display similar reactivities in the Pd-catalyzed reaction with 3-phenylpropiolic acid to afford the corresponding C-3 alkynylated indolizines. These methods allow the direct functionalization of indolizines in one step. The experimental process involved the reaction of Ethyl indolizine-1-carboxylate(cas: 93476-46-1).Product Details of 93476-46-1

The Article related to palladium catalyzed functionalization indolizine carbon hydrogen bond cleavage, Physical Organic Chemistry: Addition, Elimination, and Substitution Reactions and other aspects.Product Details of 93476-46-1

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

On December 16, 2011, Kurono, Nobuhito; Ohtsuga, Kentaro; Wakabayashi, Masanori; Kondo, Tadahiro; Ooka, Hirohito; Ohkuma, Takeshi published an article.Category: esters-buliding-blocks The title of the article was Kinetic resolution of racemic α-tert-alkyl-α-hydroxy esters by enantiomer-selective carbamoylation. And the article contained the following:

Kinetic resolution of sterically hindered racemic α-tert-alkyl-α-hydroxy esters is performed by enantiomer-selective carbamoylation with the t-Bu-Box-Cu(II) catalyst (Box = bis(oxazoline)). The reaction with 0.5 equiv of n-C3H7NCO is carried out with a substrate-to-catalyst molar ratio of 500-5000 at -20 to 25 °C. The high enantiomer-discrimination ability of the catalyst achieves an excellent stereoselectivity factor (s = kfast/kslow) of 261 in the best case. A catalytic cycle for this reaction is proposed. The experimental process involved the reaction of Methyl 2-hydroxy-3,3-dimethylbutanoate(cas: 121129-31-5).Category: esters-buliding-blocks

The Article related to kinetic resolution enantioselective carbamoylation racemic hydroxy ester, Physical Organic Chemistry: Addition, Elimination, and Substitution Reactions and other aspects.Category: esters-buliding-blocks

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

Noe, Marco; Perosa, Alvise; Selva, Maurizio published an article in 2013, the title of the article was A flexible Pinner preparation of ortho esters: the model case of trimethyl orthobenzoate.Quality Control of (Trimethoxymethyl)benzene And the article contains the following content:

In the absence of addnl. solvents, a novel procedure was implemented for the synthesis of tri-Me orthoesters through the Pinner reaction. At 5 °C, the reaction of both aliphatic and aromatic nitriles (RCN; R = Et, Bu, Ph) with a moderate excess of MeOH and gaseous HCl gave the corresponding imidate hydrochlorides [RC(:NH)OR’·HCl] in excellent yields (>90%). At 25-65 °C, the methanolysis of alkyl imidate salts provided tri-Me ortho-propionate and valerate, while only traces of tri-Me orthobenzoate (TMOB) were observed However, the aromatic hydrochloride could be readily converted into the hydrogen phosphate salt [PhC(:NH)OR’·H3PO4] which, in turn, underwent a selective (>80%) reaction with MeOH to produce TMOB in a 62% isolated yield. This allowed for an unprecedented Pinner-type synthesis of TMOB starting from benzonitrile, rather than from the highly toxic trichloromethylbenzene. Overall, remarkable improvements in safety and process intensification were achieved. The experimental process involved the reaction of (Trimethoxymethyl)benzene(cas: 707-07-3).Quality Control of (Trimethoxymethyl)benzene

The Article related to flexible pinner preparation ortho ester trimethyl orthobenzoate safety, Physical Organic Chemistry: Addition, Elimination, and Substitution Reactions and other aspects.Quality Control of (Trimethoxymethyl)benzene

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

On June 13, 2022, Puentener, Kurt; Bigler, Raphael; Stier, Kenta; Checinski, Marek P. published an article.Related Products of 3976-69-0 The title of the article was New Mechanistic Insights into the Ru-Catalyzed Asymmetric Hydrogenation of β-Ketoesters. And the article contained the following:

We describe the results of our quantum mech. investigation of the asym. hydrogenation of β-ketoesters catalyzed by [RuCl2(MeOH)2((R)-MeOBIPHEP)] (7a), which is generated in situ from [Ru(OAc)2((R)-MeOBIPHEP)] (4a) and HCl in methanol. Interestingly, HCl not only acts as an activator for 4 a as it has a dramatic effect on the reaction itself: While HCl/4 a=2 leads to rather poor results (36% ee and 13% conv. after 4 h at at a substrate-to-catalyst ratio (S/C)=50’000), HCl/4 a=20 results in high efficiency (>99.9% conv.) and enantioselectivity (99% ee favoring the opposite enantiomer) under otherwise identical conditions. The origin for this sweeping change in performance has remained a mystery for two decades. Here, we show for the first time that a highly selective HCl pathway becomes operational under acidic conditions, which outcompetes moderately selective pathways dominating under neutral conditions. Furthermore, we explain the effects of common phosphorus substituents on the activity of the catalyst. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Related Products of 3976-69-0

The Article related to ketoester ruthenium catalyst stereoselective hydrogenation mechanism, Physical Organic Chemistry: Addition, Elimination, and Substitution Reactions and other aspects.Related Products of 3976-69-0

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