Month: October 2022

HPLC of Formula: 872-36-6In 2019 ,《Silica from diatom frustules as anode material for Li-ion batteries》 was published in RSC Advances. The article was written by Norberg, Andreas Nicolai; Wagner, Nils Peter; Kaland, Henning; Vullum-Bruer, Fride; Svensson, Ann Mari. The article contains the following contents:

In spite of its insulating nature, SiO2 may be utilized as active anode material for Li-ion batteries. Synthetic SiO2 will typically require sophisticated synthesis and/or activation procedures in order to obtain a satisfactory performance. Here, we report on diatom frustules as active anode material without the need for extensive activation procedures. These are composed primarily of silica, exhibiting sophisticated porous structures. Various means of optimizing the performance were investigated. These included carbon coating, the addition of fluoroethylene carbonate (FEC) and vinylene carbonate (VC) to the carbonate-based electrolyte, as well as activation by an initial potentiostatic hold step. The highest capacity (723 mA h g-1) was obtained with composite electrodes with pristine diatom frustules and conventional carbon black as additive, with the capacity still increasing after 50 cycles. The capacity was around 624 mA h g-1 after subtraction of the contributions from the carbon black. Carbon coated diatom frustules showed a slightly lower but stable capacity after 50 cycles (600 mA h g-1 after subtraction of contributions from the carbon coating and the carbon black). By the use of electrochem. characterization methods, as well as post-mortem studies, differences in reaction mechanisms could be identified and attributed to the operating and processing parameters. In the experiment, the researchers used many compounds, for example, Vinylene carbonate(cas: 872-36-6HPLC of Formula: 872-36-6)

Vinylene carbonate(cas: 872-36-6) belongs to esters. Alkyl carbonates find applications as solvents for lithium ion battery electrolytes and the use of high quality battery grade electrolytes having extremely low water (<10 ppm) and acid (<10 ppm) contents are critical for achieving high electrochemical performance.HPLC of Formula: 872-36-6

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

《Synthesis of New Zerumbone Hydrazones and Their In-vitro Anticancer Activity》 was written by Vu, Vu V.; Vu, Tran K.. Application of 403-33-8This research focused onzerumbone hydrazone invitro anticancer activity. The article conveys some information:

A series of new zerumbone hydrazones 5a-f and 9a-f have been synthesized in via an in situ procedure in high yields. The structure of synthesized compounds has been confirmed using 1H 13C NMR and HR-MS. The bioassay result showed that several compounds exhibited cytotoxic effects against three human cancer cell lines, including HepG-2, SK-LU-1, and MCF-7. Compound 9a showed the best cytotoxic effect against HepG-2, SK-LU-1, and MCF-7 with IC50 values of 8.20, 6.66, and 9.35 μM, resp. This study aims at developing new zerumbone hydrazones as anticancer agents based on zerumbone, a natural compound wildly growing in Vietnam. A series of new zerumbone hydrazones was designed, synthesized, and evaluated for cytotoxicity against three human cancer cell lines, including HepG-2, MCF-7, and SKLu-1, using the MTT method. Especially, compound 9a displayed the best cytotoxic effect against HepG-2, SK-LU-1, and MCF-7 with IC50 values of 8.20, 6.66, and 9.35 μM, resp. The research results suggest that some compounds could be considered as leads for the future design of zerumbone hydrazones in which bio-isosteric replacements in theortho position of the Ph ring could be performed to improve the cytotoxic activity. In addition to this study using Methyl 4-fluorobenzoate, there are many other studies that have used Methyl 4-fluorobenzoate(cas: 403-33-8Application of 403-33-8) was used in this study.

Methyl 4-fluorobenzoate(cas: 403-33-8) can be used in the synthesis of trisubstituted imidazole derivatives containing a 4-fluorophenyl group, a pyrimidine ring, and a CN- or CONH2-substituted benzyl moiety.Application of 403-33-8

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

Application of 2818-08-8On September 14, 1990 ,《Caffeoylmalic and two pyrrole acids from Parietaria officinalis》 was published in Phytochemistry. The article was written by Budzianowski, Jaromir. The article contains the following contents:

A methanolic extract from leaves and flowers of P. officinalis afforded 3 acids, namely caffeoylmalic, 1H-pyrrole-2,3-dicarboxylic, and 1-[(caffeoyloxy)(carboxy)methoxy]-1H-pyrrole-2,3,5-tricarboxylic acids. In the experimental materials used by the author, we found Dimethyl 1H-pyrrole-2,3-dicarboxylate(cas: 2818-08-8Application of 2818-08-8)

Dimethyl 1H-pyrrole-2,3-dicarboxylate(cas: 2818-08-8) belongs to pyrroles. Pyrroles are components of more complex macrocycles, including the porphyrinogens and products derived therefrom, including porphyrins of heme, the chlorins, bacteriochlorins, and chlorophylls. Porphobilinogen, a trisubstituted pyrrole, is the biosynthetic precursor to many natural products such as heme.Application of 2818-08-8

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

In 2022,Organic Chemistry Frontiers included an article by Zhou, You; Wang, Li-Sheng; Lei, Shuang-Gui; Gao, Yun-Xiang; Ma, Jin-Tian; Yu, Zhi-Cheng; Wu, Yan-Dong; Wu, An-Xin. Related Products of 924-99-2. The article was titled 《I2-Promoted site-selective C-C bond cleavage of aryl methyl ketones as C1 synthons for constructing 5-acyl-1H-pyrazolo[3,4-b]pyridines》. The information in the text is summarized as follows:

A novel iodine promoted [1 + 3 + 2] cleavage cyclization reaction for the synthesis of 1H-pyrazolo[3,4-b]pyridines from aryl Me ketones, 5-aminopyrazoles and enaminones was established. This transition metal-free catalysis method has simple reaction conditions and good substrate compatibility, and was demonstrated in the transformation of alkyl and natural mol.-derived enaminones. Mechanistic studies showed that two cyclization pathways affording different key intermediates were involved, but affording the same target product after site-selective cleavage of the unstrained C-C bond of the acyl group.Ethyl 3-(dimethylamino)acrylate(cas: 924-99-2Related Products of 924-99-2) was used in this study.

Ethyl 3-(dimethylamino)acrylate(cas: 924-99-2) belongs to anime. Reduction of nitro compounds, RNO2, by hydrogen or other reducing agents produces primary amines cleanly (i.e., without a mixture of products), but the method is mostly used for aromatic amines because of the limited availability of aliphatic nitro compounds. Reduction of nitriles and oximes (R2C=NOH) also yields primary amines.Related Products of 924-99-2

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

Nishimura, Yoshio; Kikuchi, Hidetomo; Kubo, Takanori; Gokurakuji, Yuki; Nakamura, Yuri; Arai, Rie; Yuan, Bo; Sunaga, Katsuyoshi; Cho, Hidetsura published an article in Tetrahedron Letters. The title of the article was 《Synthesis of 6-unsubstituted 2-oxo, 2-thioxo, and 2-amino-3,4-dihydropyrimidines and their antiproliferative effect on HL-60 cells》.Electric Literature of C7H13NO2 The author mentioned the following in the article:

A general and efficient synthetic method for 6-unsubstituted 3,4-dihydropyrimidin-2(1H)-thiones and -ones I (R = H, C6H5, 4-ClC6H4, etc., X = S, O) has been developed. In three-component reactions, the reactivity of reagents serving as the C5-C6 fragment of the dihydropyrimidine ring was compared. The reaction of thiourea or urea, aldehydes RCHO, and Et 3-(dimethylamino)acrylate in the presence of a catalytic amount of AlCl3 by smooth heating proceeds to give I in high yields. Synthetic novelty of the protocol are as follows: (1) Lewis acid-mediated reaction, (2) good to high yields, and (3) broad scope as for aldehydes and ureas. Hitherto unavailable 6-unsubstituted 2-aminodihydropyridimidines II (R = n-Pr, Ph) have been obtained from the 2-thioxo derivative I (X = S) by a stepwise method involving substitution reaction with the amine at the 2-position. The 6-unsubstituted compounds I and 6-Me derivatives III (R = cyclohexyl, n-Pr) were assessed for their antiproliferative effect on the human promyelocytic leukemia cell line, HL-60. The 4-propyl-6-Me derivative III (R = n-Pr) showed relatively strong activity with the IC50 value of 952 nM. The experimental part of the paper was very detailed, including the reaction process of Ethyl 3-(dimethylamino)acrylate(cas: 924-99-2Electric Literature of C7H13NO2)

Ethyl 3-(dimethylamino)acrylate(cas: 924-99-2) belongs to anime. Aniline, ethanolamines, and several other amines are major industrial commodities used in making rubber, dyes, pharmaceuticals, and synthetic resins and fibres and for a host of other applications. Most of the numerous methods for the preparation of amines may be broadly divided into two groups: (1) chemical reduction (replacement of oxygen with hydrogen atoms in the molecule) of members of several other classes of organic nitrogen compounds and (2) reactions of ammonia or amines with organic compounds.Electric Literature of C7H13NO2

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

In 2016,Thikekar, Tushar Ulhas; Selvaraju, Manikandan; Sun, Chung-Ming published 《Skeletally Diverse Synthesis of Indole-Fused Diazocine and Diazepine Frameworks by One-Pot, Two-Component Cascade Reaction》.Organic Letters published the findings.Application of 329-59-9 The information in the text is summarized as follows:

An expeditious and novel strategy has been explored for the synthesis of structurally diverse indole-fused diazocine and diazepine derivatives A substrate-based diversification approach of methyl-3-aminoindole/indoline benzoates coupled with the Pictet-Spengler reaction and three different reaction cascades furnished indolodiazepine and indoloquinoxalines. The formation of indolodiazocines proceeds through an initial condensation followed by intramol. alkylation. After reading the article, we found that the author used Methyl 4-fluoro-3-nitrobenzoate(cas: 329-59-9Application of 329-59-9)

Methyl 4-fluoro-3-nitrobenzoate(cas: 329-59-9) belongs to methyl benzoate. Methyl benzoate reacts at both the ring and the ester, depending on the substrate. Electrophiles attack the ring, illustrated by acid-catalysed nitration with nitric acid to give methyl 3-nitrobenzoate.Application of 329-59-9Methyl 4-fluoro-3-nitrobenzoate is used to prepare dimethyl 3-nitro-3′,4-oxydibenzoate by reacting with 3-hydroxy-benzoic acid methyl ester.

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

In 2016,Nguyen, Thuy Linh; Ferrie, Laurent; Figadere, Bruno published 《Synthesis of 3,5-disubstituted-1,2-dioxolanes: access to analogues of mycangimycin and some rearrangement products》.Tetrahedron Letters published the findings.Name: Methyl 3-hydroxypropanoate The information in the text is summarized as follows:

Mycangimycin is a eicosa-heptenic acid containing an unprecedented 3,5-disubstituted-1,2-dioxolane ring with promising anti-fungal and antimalarial activity. Most reported methods to prepare 1,2-dioxolanes are targeting 3,3,5,5-tetrasubstituted or 3,3,5-trisubstituted 1,2-dioxolanes. Thus, some methods for synthesizing these unusual 3,5-disubstituted 1,2-dioxolanes were investigated. The most promising approach was the use of a Kulinkovich reaction followed by an oxidative ring opening of the cyclopropanol with Co(acac)2 to reach the peroxy-hemiketal structure. Successive triflic acid mediated silane reduction of the corresponding peroxy-hemiketal afforded the expected 3,5-disubstituted-1,2-dioxolane ring. Through our studies, some unprecedented rearrangements of 1,2-dioxolane rings were observed, which will be discussed in this Letter. Finally, two saturated analogs I and II of mycangimycin were synthesized. The experimental process involved the reaction of Methyl 3-hydroxypropanoate(cas: 6149-41-3Name: Methyl 3-hydroxypropanoate)

Methyl 3-hydroxypropanoate(cas: 6149-41-3) belongs to esters with low molecular weight are commonly used as fragrances and found in essential oils and pheromones. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Name: Methyl 3-hydroxypropanoate

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

In 2017,Matsumoto, Shoji; Moteki, Jun; Ito, Yuji; Akazome, Motohiro published 《Relationship between mechanochromic behavior and crystal structures in donor-π-acceptor compounds consisted of aromatic rings with ester moiety as an acceptor》.Tetrahedron Letters published the findings.Category: esters-buliding-blocks The information in the text is summarized as follows:

The authors studied the mechanochromic behavior of donor-π-acceptor compounds which consisted of diphenylaminophenylacetylene as a donor-π moiety and (hetero)aromatic ring bearing ester as an acceptor. The compounds with dicyanobenzoic ester gave the bathochromic shift by grinding, whereas the compounds consisting of the ester with benzene, imidazole, and thiazole rings showed the hypsochromic shift. From single-crystal x-ray anal., the authors revealed that the compound with bathochromic shift gave the herringbone alignment with H-aggregate-like π-stacking in the crystal structure. On the contrary, the compounds with hypsochromic shift showed the structure with the alignment of long axis of the mol. in crystal structure. In the experiment, the researchers used Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1Category: esters-buliding-blocks)

Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1) belongs to anime. Hydrogen peroxide (H2O2) and peroxy acids generally add an oxygen atom to the nitrogen of amines. With primary amines, this step is normally followed by further oxidation, leading to nitroso compounds, RNO, or nitro compounds, RNO2. Secondary amines are converted to hydroxylamines, R2NOH, and tertiary amines to amine oxides, R3NO.Category: esters-buliding-blocks

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

In 2017,Loucaides, Socratis; Rerolle, Victoire M. C.; Papadimitriou, Stathys; Kennedy, Hilary; Mowlem, Matthew C.; Dickson, Andrew G.; Gledhill, Martha; Achterberg, Eric P. published 《Characterization of meta-Cresol Purple for spectrophotometric pH measurements in saline and hypersaline media at sub-zero temperatures》.Scientific Reports published the findings.Formula: C8H6FNO4 The information in the text is summarized as follows:

Accurate pH measurements in polar waters and sea ice brines require pH indicator dyes characterized at near-zero and below-zero temperatures and high salinities. We present exptl. determined phys. and chem. characteristics of purified meta-Cresol Purple (mCP) pH indicator dye suitable for pH measurements in seawater and conservative seawater-derived brines at salinities (S) between 35 and 100 and temperatures (T) between their f.p. and 298.15 K (25°C). Within this temperature and salinity range, using purified mCP and a novel thermostated spectrophotometric device, the pH on the total scale (pHT) can be calculated from direct measurements of the absorbance ratio R of the dye in natural samples aspHT = – log(kT2e2) + log(((R – e1)/(1 – R(e3/e2)))) Based on the mCP characterization in these extended conditions, the temperature and salinity dependence of the molar absorptivity ratios and – log(kT2e2) of purified mCP is described by the following functions: e1 = -0.004363 + 3.598 × 10-5T, e3/e2 = -0.016224 + 2.42851 × 10-4T + 5.05663 × 10-5(S – 35), and – log(kT2e2) = -319.8369 + 0.688159 S -0.00018374 S2 + (10508.724 – 32.9599 S + 0.059082S2) T-1 + (55.54253 – 0.101639 S) ln T -0.08112151T. This work takes the characterization of mCP beyond the currently available ranges of 278.15 K = T = 308.15 K and 20 = S = 40 in natural seawater, thereby allowing high quality pHT measurements in polar systems.Methyl 4-fluoro-3-nitrobenzoate(cas: 329-59-9Formula: C8H6FNO4) was used in this study.

Methyl 4-fluoro-3-nitrobenzoate(cas: 329-59-9) belongs to methyl benzoate. Methyl benzoate reacts at both the ring and the ester, depending on the substrate. Electrophiles attack the ring, illustrated by acid-catalysed nitration with nitric acid to give methyl 3-nitrobenzoate.Formula: C8H6FNO4

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

In 2019,Journal of Insect Physiology included an article by Wen, Ming; Li, Ertao; Chen, Qi; Kang, Hui; Zhang, Shuai; Li, Kebin; Wang, Yinliang; Jiao, Yin; Ren, Bingzhong. Related Products of 119-36-8. The article was titled 《A herbivore-induced plant volatile of the host plant acts as a collective foraging signal to the larvae of the meadow moth, Loxostege sticticalis (Lepidoptera: Pyralidae)》. The information in the text is summarized as follows:

The meadow moth Loxostege sticticalis is a serious agricultural pest that feeds on the leaves of many economic crops, such as sugar beet, soybean, sunflower, and potato. In addition to the rapid migration of adult moths, the collective foraging behavior of the larvae is also thought to be involved in the search for new food sources and substantially contributes to the expansion of the infested area. However, whether and how the chem. signals take part in this process remains unknown. In this study, two larva-specific expressed odorants, LstiOR5 and LstiOR6, were successfully cloned and deophanized. A heterologous study on Xenopus laevis oocytes showed that several host plant volatiles could evoke LstiOR responses in a dose-dependent manner. One herbivore-induced plant volatile (HIPV) of soybean leaves, Me salicylate (MeSA), exerted attractive effects on the L. sticticalis larvae at all tested concentrations Further foraging choice assays showed that the L. sticticalis larvae preferred foraged soybean leaves over unforaged leaves. When MeSA was artificially added to unforaged leaves, the unforaged leaves were preferred over the foraged leaves. In addition, GC-MS anal. demonstrated that MeSA was induced by the foraging behavior of the larvae and acted as a collective food signal in L. sticticalis. Moreover, in situ hybridization showed that LstiOR5 was highly expressed in larval antenna neurons. When LstiOR5 was silenced, both the electrophysiol. response of the antenna to MeSA and the preference for foraged leaves were significantly decreased, suggesting that LstiOR5 is involved in the collective foraging behavior of L. sticticalis. Our results clarified the chem. signals that trigger the collective foraging behavior of L. sticticalis and provided more evidence for the mol. mechanism underlying the expansions of their infested areas at a peripheral olfactory sensing level. These findings could facilitate the development of potential control strategies for controlling this pest and provide a potential gene target that correlates with the collective foraging behavior of L. sticticalis, which might lead to better pest management. In the experiment, the researchers used many compounds, for example, Methyl Salicylate(cas: 119-36-8Related Products of 119-36-8)

Methyl Salicylate(cas: 119-36-8) has been used: as a component of clarifying solution for treating Mongolian gerbil cochlea intact for immunofluorescence analysis, as a plant elicitor to test its effect on reducing the whitefly population from tomato plants.Related Products of 119-36-8

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