Month: November 2022

Liu, Tao; Yuan, Xiaoxue; Zhang, Gang; Zeng, Yi; Chen, Tong; Wang, Gongying published an article in 2019, the title of the article was Influence of coordinating groups of organotin compounds on the Fries rearrangement of diphenyl carbonate.Reference of Phenyl Salicylate And the article contains the following content:

In this paper, the Fries rearrangement of di-Ph carbonate (DPC) catalyzed by organotin compounds with different coordination groups was studied for the first time. The electronic effect and steric hindrance of the coordinating groups were discussed with respect to the reactivity of DPC rearrangement. The results showed that both the electronic effect and steric hindrance of the coordinating groups influenced the acidity of the active tin centers and then affected the catalytic performance of organotin as a Lewis acid for the rearrangement of DPC, and the influence of the electronic effect is greater than that of steric hindrance. The catalytic activity is in the order of BuSnO(OH) > Bu2SnO > Bu2Sn(OCOC11H23)2 > BuSnCl3 > Bu3SnOSnBu3 > Bu3SnCl, and Bu2SnO showed the best catalytic activity due to its strong electron absorption effect, small steric hindrance, and good stability. Under the optimum reaction conditions, the conversion of DPC was up to 93%, and the yields of Ph salicylate (PS) and xanthone (XA) were 62% and 28%, resp. In addition, a reaction mechanism of DPC rearrangement catalyzed by the organotin compounds was speculated. This research can provide vigorous theor. data support to control the byproducts produced by DPC rearrangement in the process of DPC synthesis. It also provides a new route for the preparation of PS and XA. The experimental process involved the reaction of Phenyl Salicylate(cas: 118-55-8).Reference of Phenyl Salicylate

The Article related to diphenyl carbonate organotin catalyst fries rearrangement mechanism, Physical Organic Chemistry: Rearrangements, Including Isomerization and Tautomerization and other aspects.Reference of Phenyl Salicylate

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

On July 30, 1993, Tomioka, Hideo; Taketsuji, Kohji published an article.COA of Formula: C10H10O3 The title of the article was Formation of heptafulvene in reactions of [(methoxycarbonyl)methyl]phenylcarbene in the gas phases. And the article contained the following:

Flash vacuum pyrolysis of [[(methoxycarbonyl)methyl]phenyl]diazomethane (I) produced 1-(methoxycarbonyl)benzocyclobutene (II), as a result of intramol. C-H insertion in the ortho isomer of [[(methoxycarbonyl)methyl]phenyl]carbene (III) generated by carbene-carbene rearrangement, and 8-(methoxycarbonyl)heptafulvene (IV), presumably formed by intramol. H migration in the seven-membered ring intermediates involved in the rearrangement. The experimental process involved the reaction of Methyl 2-(3-formylphenyl)acetate(cas: 142327-44-4).COA of Formula: C10H10O3

The Article related to heptafulvene, methoxycarbonylmethylphenylcarbene rearrangement gas mechanism, Physical Organic Chemistry: Rearrangements, Including Isomerization and Tautomerization and other aspects.COA of Formula: C10H10O3

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

On April 30, 2022, Bai, Hualong; Zhang, Liwei; Sun, Peng; Wu, Haoliang; Li, Mingxing; Gu, Yulei; Zhang, Cong; Lou, Chunyang; Li, Jing’an published an article.Application of 2358-84-1 The title of the article was ADAM17: A novel treatment target for aneurysms. And the article contained the following:

The mechanisms underlying abdominal aortic aneurysms (AAAs) are still not fully understood, previous researches showed ADAM17 is increased in aneurysm. We hypothesized that inhibiting ADAM17 can decrease AAA formation and progression. Aneurysm models were established in mouses and rats by aortic adventitial CaCl2 incubation and aortic pericardial patch angioplasty resp. In mouse, control (no treatment) or SA/HA hydrogel loaded with TAPI-1 (ADAM17 inhibitor) were adventitial applied; in rat, control and TAPI-1 coated pericardial patch were used in rat aortic pericardial patch angioplasty. Samples were harvested on day 14 or 30 and analyzed by immunofluorescence. Bioinformatics anal. and immunostaining anal. were carried out to confirm the therapeutic potential of ADAM17 in the human AAA. ADAM17 was highly expressed in mouses, rats and human aneurysms. Adventitial application of SA/HA hydrogel loaded TAPI-1 or TAPI-1 conjugated pericardial patch can decrease AAA formation and progression in mouses and rats, resp. Bioinformatic anal. showed ADAM17 promotes transformation of M1 macrophages and synthetic vascular smooth muscle cells, together with immunostaining anal. and results from animal models, the therapeutic potential of ADAM17 in the human AAA were confirmed. We showed that local delivery of ADAM17 inhibitor can inhibit aneurysm formation and progression in mouse and rat, these results showed ADAM17 plays an important role in the aneurysm formation and may be a potential treatment target. The experimental process involved the reaction of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)(cas: 2358-84-1).Application of 2358-84-1

The Article related to adam aneurysm treatment target, adam17, aneurysm, macrophage, smooth muscle cells, Mammalian Pathological Biochemistry: Hematology and Reticuloendothelial System Diseases and other aspects.Application of 2358-84-1

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

On September 2, 2014, Anderson, Katie; Laclef, Sylvain; Barrett, Anthony G. M. published an article.Reference of (R)-Methyl 3-hydroxybutanoate The title of the article was Mechanistic studies of highly regioselective decarboxylative-prenyl migration reactions of prenyloxycarbonyl-diketo-dioxinones. And the article contained the following:

Mechanistic studies of tandem regioselective decarboxylation, prenyl transfer, and aromatization reactions of prenyl dioxinone diketo-carboxylates to provide 3-prenyl-resorcylate derivatives are described. Studies of the effects of concentration and the base employed as well as the results of cross-over experiments were all found to be consistent with the reaction proceeding largely via an intermol. reaction pathway. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Reference of (R)-Methyl 3-hydroxybutanoate

The Article related to mechanistic regioselective decarboxylative prenyl migration prenyloxycarbonyl diketodioxinone crystallog, Physical Organic Chemistry: Rearrangements, Including Isomerization and Tautomerization and other aspects.Reference of (R)-Methyl 3-hydroxybutanoate

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

On June 21, 2021, Geng, Jun-shan; Liu, Kang; Liang, Yuan-yuan; Yu, Ji-pan; Hu, Kong-qiu; Yuan, Li-Hua; Feng, Wen; Chai, Zhi-fang; Mei, Lei; Shi, Wei-qun published an article.SDS of cas: 1312703-30-2 The title of the article was An Azobenzene-Modified Photoresponsive Thorium-Organic Framework: Monitoring and Quantitative Analysis of Reversible trans-cis Photoisomerization. And the article contained the following:

Monitoring and quantification of the photoresponsive behavior of metal-organic frameworks that respond to a light stimulus are crucial to establish a clear structure-activity relationship related to light regulation. Herein, we report the first azobenzene-modified photoresponsive thorium-organic framework (Th-Azo-MOF) with the formula [Th6O4(OH)4(H2O)6L6] (H2L = (E)-2′-p-tolyldiazenyl-1,1′:4′,4′-terphenyl-4,4”-dicarboxylic acid), in which the utilization of a thorium cluster as a metal node leads to one of the largest pore sizes among all the azobenzene-containing metal-organic frameworks (MOFs). The phototriggered transformation of the trans isomer to the cis isomer is monitored and characterized quant. by comprehensive analyses of NMR and UV spectroscopy, which reveals that the maximum isomerization ratio of cisTh-Azo-MOF in the solid state is 19.7% after irradiation for 120 min, and this isomerization is reversible and can be repeated several times without apparent performance changes. Moreover, the isomerization-related difference in the adsorption of the Rhodamine B guest is also illustrated and a possible photoregulated mechanism is proposed. This work will shed light on new explorations for constructing functionalized actinide porous materials by the elegant combination of actinide nodes with tailored organic ligands and furthermore will provide a comprehensive understanding of photoisomerization processes in MOF solids and insight into the mechanism on photoregulated cargo adsorption and release by photoactive MOFs. The experimental process involved the reaction of Dimethyl 2′-amino-[1,1′:4′,1”-terphenyl]-4,4”-dicarboxylate(cas: 1312703-30-2).SDS of cas: 1312703-30-2

The Article related to azobenzene modified photoresponsive thorium organic framework crystallog, reversible trans cis photoisomerization mof thorium, Physical Organic Chemistry: Rearrangements, Including Isomerization and Tautomerization and other aspects.SDS of cas: 1312703-30-2

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

On March 15, 2011, Jang, Yoon-Seok; Kim, Sung-Hyun; Yoo, Ki-Pung; Byun, Hun-Soo published an article.Related Products of 1985-51-9 The title of the article was Phase behavior measurement for the binary mixture of CO2 + neopentyl glycol diacrylate and CO2 + neopentyl glycol dimethacrylate systems at high pressure. And the article contained the following:

In this work, the solubility curves for the CO2 + neopentyl glycol diacrylate (NPGDA) and CO2 + neopentyl glycol dimethacrylate (NPGDMA) systems are measured in static method at five temperatures of (313.2, 333.2, 353.2, 373.2 and 393.2) K and pressures up to 25.28 MPa. Both CO2 + di(meth)acrylate systems have continuous critical mixture (locus) curves that exhibit maximum in pressure-temperature space between the critical temperatures of CO2 and neopentyl glycol di(meth)acrylate. The solubility of CO2 in the CO2 + neopentyl glycol di(meth)acrylate mixture decreases as the temperature increases at a constant pressure. The CO2 + NPGDA and CO2 + NPGDMA systems exhibit type-I phase behavior. The exptl. results for the CO2 + NPGDA and CO2 + NPGDMA systems are correlated with Peng-Robinson equation of state using a mixing rule including two adjustable parameters. The critical properties of NPGDA and NPGDMA are predicted with Joback-Lyderson and Lee-Kesler method. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Related Products of 1985-51-9

The Article related to carbon dioxide npgda npgdma binary mixture phase transition, Phase Equilibriums, Chemical Equilibriums, and Solutions: Phase Equilibriums, Solubility and other aspects.Related Products of 1985-51-9

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

On November 20, 2020, Greis, Kim; Kirschbaum, Carla; Leichnitz, Sabrina; Gewinner, Sandy; Schoellkopf, Wieland; von Helden, Gert; Meijer, Gerard; Seeberger, Peter H.; Pagel, Kevin published an article.SDS of cas: 2873-29-2 The title of the article was Direct Experimental Characterization of the Ferrier Glycosyl Cation in the Gas Phase. And the article contained the following:

The Ferrier rearrangement reaction is crucial for the synthesis of pharmaceuticals. Although its mechanism was described more than 50 years ago, the structure of the intermediate remains elusive. Two structures have been proposed for this Ferrier glycosyl cation: a 1,2-unsaturated cation that is resonance-stabilized within the pyranose ring or a cation that is stabilized by the anchimeric assistance of a neighboring acetyl group. Using a combination of gas-phase cryogenic IR spectroscopy in helium nanodroplets and first-principles d. functional theory, we provide the first direct structural characterization of Ferrier cations. The data show that both acetylated glucal and galactal lead to glycosyl cations of the dioxolenium type. The experimental process involved the reaction of (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate(cas: 2873-29-2).SDS of cas: 2873-29-2

The Article related to ferrier glycosyl cation gas phase structure exptl characterization, Physical Organic Chemistry: Degradation Reactions, Including Mass Spectral Fragmentation and other aspects.SDS of cas: 2873-29-2

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

On January 5, 1986, Iwasaki, Genji; Saeki, Seitaro; Hamana, Masatomo published an article.Safety of tert-Butyl 2-(4-nitrophenyl)acetate The title of the article was Nucleophilic substitution of p-dinitrobenzene with some carbanions. Formation of p-substituted nitrobenzenes. And the article contained the following:

Treatment of p-O2NC6H4NO2 with RH (R = CH2COMe, CHMeCOEt, CHEtCOMe, CMe2COCHMe2, CH2CO2Et, CH2CO2CMe3, CH2CN, CHPhCN, CMePhCN, PhNH 2-oxocyclopentyl, 2-oxocyclohexyl, cyano-1-naphthylmethyl, 2-pyridylamino) in the presence of Me3COK in liq NH3 at -70° gave p-O2NC6H4R in 18-97.6% yields. The experimental process involved the reaction of tert-Butyl 2-(4-nitrophenyl)acetate(cas: 29704-38-9).Safety of tert-Butyl 2-(4-nitrophenyl)acetate

The Article related to nitrobenzene nucleophile substitution, carbanion substitution dinitrobenzene, Benzene, Its Derivatives, and Condensed Benzenoid Compounds: Nitro and Nitroso Compounds and other aspects.Safety of tert-Butyl 2-(4-nitrophenyl)acetate

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

On November 30, 1990, Eichinger, Peter C. H.; Hayes, Roger N.; Bowie, John H. published an article.SDS of cas: 121129-31-5 The title of the article was Anionic rearrangement in the gas phase. The collision-induced loss of carbon monoxide from deprotonated pyruvates and hydroxyacetates. And the article contained the following:

Deprotonated pyruvates and hydroxyacetates, upon collisional activation, undergo loss of CO by anionic rearrangement through alkoxycarbonyl ion complexes, e.g., -CH2COCO2Me �[(CH2CO)-CO2Me] �-(CH2CO2Me) + CO or [CH2CO)-CO2Me] �[MeO-(CH2CO)] + CO, and MeC(O-)HCO2Me �[(MeCHO)-CO2Me] �MeCH(OMe)O- + CO. Such processes have been substantiated by labeling (2H, 13C) and product-ion studies. The experimental process involved the reaction of Methyl 2-hydroxy-3,3-dimethylbutanoate(cas: 121129-31-5).SDS of cas: 121129-31-5

The Article related to rearrangement anion gas phase, collisional activation mass spectra pyruvate hydroxyacetate, Physical Organic Chemistry: Degradation Reactions, Including Mass Spectral Fragmentation and other aspects.SDS of cas: 121129-31-5

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

On March 31, 2022, Al-Dalali, Sam; Zheng, Fuping; Sun, Baoguo; Rahman, Talmizur; Chen, Feng published an article.Product Details of 123-25-1 The title of the article was Tracking volatile flavor changes during two years of aging of Chinese vinegar by HS-SPME-GC-MS and GC-O. And the article contained the following:

Aging is an essential step for enriching the aroma profiles of Chinese vinegar. This study aimed to track the volatile flavor changes in the same batch of Chinese vinegar for the first time during two years of aging with the aid of HS-SPME-GC-MS. The aroma-active compounds were characterized at 0, 6, and 12 mo of aging using GC-O coupled with a modified frequency method. A total of 67 volatile compounds and 30 aroma-active compounds were identified during the different stages of aging. Most alcs., esters, ketones, acids, and phenols decreased during the aging from 628.4, 105.4, 132.1, 22.1, and 21.4μg/L at 0 mo to 228.7, 7.2, 9.69, 17.24, and 11.6μg/L at 24 mo sep., except aldehydes and pyrazines, which showed slight increases. Many aroma-active compounds were generated during the aging, such as methional, trimethylpyrazine, acetophenone, and 2-acetyl-3-ethylpyrazine, while pyrazines were formed during 24 mo of aging. Three aroma-active compounds with high odor activity values (OAVs) showed significant contributions to the aroma profile of vinegar, which included isovaleric acid (2743, 340, and 3139), 4-ethylguaiacol (580, 429, and 516), and γ-nonalactone (324, 640, and 442) at 0, 6, and 12 mo of aging, resp. The experimental process involved the reaction of Diethyl succinate(cas: 123-25-1).Product Details of 123-25-1

The Article related to tracking volatile flavor chinese vinegar aging hsspme gcms gco, Food and Feed Chemistry: Additives, Sweeteners, Flavorings, Condiments, and Confectionery and other aspects.Product Details of 123-25-1

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