Month: November 2022

The author of 《Rh(III)-catalyzed annulation of Boc-protected benzamides with diazo compounds: approach to isocoumarins》 were Dong, Guangyu; Li, Chunpu; Liu, Hong. And the article was published in Molecules in 2019. Safety of Ethyl 3-oxopentanoate The author mentioned the following in the article:

Isocoumarins I [R1 = H, 6-F, 7-Cl, etc.; R2 = Me, i-Pr, 4-MeOC6H4, etc.; R3 = Me, Et, n-Pr, t-Bu, CH2CH=CH2, Bn] were prepared via rhodium-catalyzed C-H activation/annulation of diazo compounds with Boc-protected benzamide substrates. The tert-Bu formylcarbamate group formally served as an oxidizing DG using the C-N bond as an internal oxidant. In this strategy, the novel Boc-amide groups as removable directing groups enabled the benzamides to construct C-C/C-O bonds to provide isocoumarins I.Ethyl 3-oxopentanoate(cas: 4949-44-4Safety of Ethyl 3-oxopentanoate) was used in this study.

Ethyl 3-oxopentanoate(cas: 4949-44-4) belongs to ketone compounds. They are most widely used as solvents, especially in industries manufacturing explosives, lacquers, paints, and textiles. Ketones are also used in tanning, as preservatives, and in hydraulic fluids.Safety of Ethyl 3-oxopentanoate

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

《Identification and analysis of key genes involved in methyl salicylate biosynthesis in different birch species》 was published in PLoS One in 2020. These research results belong to Singewar, Kiran; Moschner, Christian R.; Hartung, Eberhard; Fladung, Matthias. Name: Methyl Salicylate The article mentions the following:

In this study, we performed a comprehensive bioinformatics anal. of two candidate genes mediating MeSA biosynthesis, SALICYLIC ACID METHYLTRANSFERASE (SAMT) and SALICYLIC ACID-BINDING PROTEIN 2 (SABP2), of high (B. lenta, B. alleghaniensis, B. medwediewii, and B. grossa) and low (B. pendula, B. utilis, B. alnoides, and B. nana) MeSA-producing birch species. Phylogenetic analyses of SAMT and SABP2 genes and homologous genes from other plant species confirmed their evolutionary relationships. Multiple sequence alignments of the amino acid revealed the occurrence of important residues for substrate specificity in SAMT and SABP2. The anal. of cis elements in different birches indicated a functional multiplicity of SAMT and SABP2 and provided insights into the regulation of both genes. We successfully developed six prominent single nucleotide substitution markers that were validated with 38 addnl. birch individuals to differentiate high and low MeSA-producing birch species. Relative tissue-specific expression anal. of SAMT in leaf and bark tissue of two high and two low MeSA-synthesizing birches revealed a high expression in the bark of both high MeSA-synthesizing birches. In contrast, SABP2 expression in tissues revealed indifferent levels of expression between species belonging to the two groups. The comparative expression and bioinformatics analyses provided vital information that could be used to apply plant genetic engineering technol. in the mass production of organic MeSA. In addition to this study using Methyl Salicylate, there are many other studies that have used Methyl Salicylate(cas: 119-36-8Name: Methyl Salicylate) was used in this study.

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.Name: Methyl Salicylate

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

《Formation of trisubstituted buta-1,3-dienes and α,β-unsaturated ketones via the reaction of functionalized vinyl phosphates and vinyl phosphordiamidates with organometallic reagents》 was published in RSC Advances in 2020. These research results belong to Oeser, Petr; Koudelka, Jakub; Dvorakova, Hana; Tobrman, Tomas. Computed Properties of C7H12O3 The article mentions the following:

The reactions of vinyl phosphates and vinyl phosphordiamidates containing an ester functional group with organometallic reagents were studied. The functionalized vinyl phosphates were smoothly converted into tri- and tetrasubstituted buta-1,3-dienes via the reaction with aryllithium reagents were found. Moreover, the vinyl phosphordiamidates were converted into α,β-unsaturated ketones using Grignard reagents. Based on the performed experiments, a reaction mechanism, which was confirmed by means of the isolation of key intermediates were presented. In the experiment, the researchers used Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3Computed Properties of C7H12O3)

Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3) belongs to ketone compounds. Ketones are highly reactive, although less so than aldehydes, to which they are closely related. Much of their chemical activity results from the nature of the carbonyl group. Ketones readily undergo a wide variety of chemical reactions.Computed Properties of C7H12O3

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

《γ-Selective Vinylogous Aza-Morita-Baylis-Hillman Reaction with N-Carbamoylimines》 was written by Gondo, Naruhiro; Tanigaki, Yusuke; Ueda, Yoshihiro; Kawabata, Takeo. Category: esters-buliding-blocks And the article was included in Synlett in 2020. The article conveys some information:

Vinylogous aza-Morita-Baylis-Hillman (aza-MBH) reactions of 3-vinylcyclopentenone with N-Boc imines RCH=NC(O)OC(CH3)3 (R = Ph, pyridin-3-yl, 3-chlorophenyl, etc.) provide the corresponding γ-adducts RCH(NHC(O)OC(CH3)3)C(=CH2)R1 (R1 = 3-oxocyclopent-1-en-1-yl) in high regioselectivity (10 examples). While the corresponding reactions with N-Ts imines such as 4-methyl-N-(phenylmethylidene)benzene-1-sulfonamide give the α-adducts such as N-[(2-ethenyl-5-oxocyclopent-1-en-1-yl)(phenyl)methyl]-4-methylbenzene-1-sulfonamide and γ-adducts depending on the catalyst, those with N-Boc imines proceed in a γ-selective manner, irresp. of the promoter. The nature of the protecting groups on the nitrogen of aldimines is found to play a key role in the regiochem. course of vinylogous aza-MBH reactions. The results came from multiple reactions, including the reaction of tert-Butyl carbamate(cas: 4248-19-5Category: esters-buliding-blocks)

tert-Butyl carbamate(cas: 4248-19-5) belongs to anime. The methylamines occur in small amounts in some plants. Many polyfunctional amines (i.e., those having other functional groups in the molecule) occur as alkaloids in plants—for example, mescaline, 2-(3,4,5-trimethoxyphenyl)ethylamine; the cyclic amines nicotine, atropine, morphine, and cocaine; and the quaternary salt choline, N-(2-hydroxyethyl)trimethylammonium chloride, which is present in nerve synapses and in plant and animal cells.Category: esters-buliding-blocks

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

Yun, Jing; Cui, Chuanjian; Zhang, Shihua; Zhu, Jiaji; Peng, Chuanyi; Cai, Huimei; Yang, Xiaogen; Hou, Ruyan published their research in Food Chemistry in 2021. The article was titled 《Use of headspace GC/MS combined with chemometric analysis to identify the geographic origins of black tea》.SDS of cas: 119-36-8 The article contains the following contents:

Some black teas demand high market prices. Black tea samples (306) collected from 10 geog. origins, including China (Guxi, Likou, Jinzipai, Guichi, Dongzhi, Changning, Wuyishan, Shaowu), India (Darjeeling), and Sri Lanka (Kandy), were analyzed using headspace volatilization followed by GC/MS (HS-GC/MS). Forty-eight volatile compounds were identified. The aroma compounds were mainly identified as alcs., aldehydes, ketones, and esters. Anal. of either full-spectrum data or 22 tea compounds shared among the samples with k-Nearest Neighbor (k-NN) and Random Forest (RF) models discriminated all origins at 100% using KNN and 95% with RF using either data set. The discrimination rates using 2 key aroma compounds (linalool and geraniol) by k-NN were 100% for nine origins, with the rate for Guxi area at 89%, because 3 samples were classified to Jinzipai. The findings support the use of HS-GC/MS combined with chemometrics as a tool to identify the origin of black tea. The experimental process involved the reaction of Methyl Salicylate(cas: 119-36-8SDS of cas: 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.SDS of cas: 119-36-8

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

In 2022,Liu, Shuai; Zhao, Wenxuan; Li, Jin; Wu, Na; Liu, Chang; Wang, Xin; Li, Shuohao; Zhu, Yan; Liang, Yong; Cheng, Xu published an article in CCS Chemistry. The title of the article was 《Electrochemical aziridination of tetrasubstituted alkenes with ammonia》.SDS of cas: 609-14-3 The author mentioned the following in the article:

Ammonia (NH3) is an ideal nitrogen source in terms of availability, reactivity, safety, atom economy, environmental compatibility, and ease of isolation. However, its utility for amine synthesis is limited by its high bond dissociation energy, its strong coordination ability, and the difference between its reactivity and that of the product amines. Herein, authors reported the first electrochem. protocol for direct syntheses of unprotected tetrasubstituted aziridines with NH3 and alkenes in the absence of an oxidant, which are highly challenging to achieve by other methods. The combination of graphite felt as the anode material and MeOH as the solvent was the key to the success of the protocol, and the effects of these factors were investigated by means of cyclic voltammetry and d. functional theory calculations In the experimental materials used by the author, we found Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3SDS of cas: 609-14-3)

Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3) belongs to ketone compounds. Ketones are highly reactive, although less so than aldehydes, to which they are closely related. Much of their chemical activity results from the nature of the carbonyl group. Ketones readily undergo a wide variety of chemical reactions.SDS of cas: 609-14-3

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

Reference of tert-Butyl carbamateIn 2021 ,《Asymmetric Total Synthesis of (+)-Quinocarcinamide》 appeared in Organic Letters. The author of the article were Li, Lei; Shi, Li; Wei, Kun; Yang, Yu-Rong. The article conveys some information:

The first asym. total synthesis of (+)-quinocarcinamide I, an enantiomer of the natural oxidation product from antitumor antibiotic (-)-quinocarcin was described. Key steps include an iridium-catalyzed asym. allylic amidation of racemic 1-(2-bromo-6-methoxyphenyl)prop-2-en-1-ol, olefin cross-metathesis followed by a SN2′ to forge tetrahydroisoquinoline II, and stereocontrolled 1,3-dipolar cycloaddition between a facilely generated azomethine ylide IIIand tert-Bu acrylate to construct the diazabicyclo[3.2.1]octane ring IV. In the experimental materials used by the author, we found tert-Butyl carbamate(cas: 4248-19-5Reference of tert-Butyl carbamate)

tert-Butyl carbamate(cas: 4248-19-5) belongs to anime. Nitrous acid converts secondary amines (aliphatic or aromatic) to N-nitroso compounds (nitrosamines): R2NH + HNO2 → R2N―NO. Some nitrosamines are potent cancer-inducing substances, and their possible formation is a serious consideration when nitrites, which are salts of nitrous acid, are present in foods or pharmaceutical preparations. Tertiary amines give rise to nitrosamines more slowly; an alkyl group is eliminated as an aldehyde or ketone, along with nitrous oxide, N2O.Reference of tert-Butyl carbamate

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

Quality Control of Methyl 3-hydroxypropanoateIn 2020 ,《Solar-Enhanced Plasma-Catalytic Oxidation of Toluene over a Bifunctional Graphene Fin Foam Decorated with Nanofin-like MnO2》 was published in ACS Catalysis. The article was written by Bo, Zheng; Yang, Shiling; Kong, Jing; Zhu, Jinhui; Wang, Yaolin; Yang, Huachao; Li, Xiaodong; Yan, Jianhua; Cen, Kefa; Tu, Xin. The article contains the following contents:

the authors proposed a unique hybrid process combining solar irradiation and post-plasma catalysis (PPC) to effectively oxidize toluene over a stable, highly active MnO2/bifunctional graphene fin foam (GFF) catalyst. the bifunctional GFF, serving as catalyst support and light absorber, was decorated with MnO2 nanofins to form a hierarchical fin-on-fin structure. results showed the MnO2/GFF catalyst effectively captures/converts renewable solar energy into heat (>95% absorption), leading to a temperature rise (55.6°) of the catalyst bed from solar irradiation (1 sun, 1000 W/m2 light intensity). catalyst weight (9.8 mg) was significantly lower (10-100 times lower) than that used in previous studies (usually 100-1000 mg). introducing solar energy into the typical PPC process via solar thermal conversion significantly enhanced toluene conversion and CO2 selectivity (36-63%), reaching ∼93% for toluene conversion and ∼83% for CO2 selectivity at ∼350 J/L specific input energy to remarkably reduce the energy consumption of the plasma-catalytic gas cleaning process. toluene conversion energy efficiency for solar-enhanced post-plasma catalytic (SEPPC) process was up to 12.7 g/kWh, ∼57% higher than that using the PPC process without solar irradiation (8.1 g/kWh); SEPPC process energy consumption was reduced 35-52%. the MnO2/GFF catalyst exhibited excellent self-cleaning induced by solar irradiation, demonstrating superior long-term catalytic stability (72 h at 1 sun), significantly better than that reported in previous work. the prominent synergistic effect of solar irradiation and PPC with a synergistic capacity of ∼42% was mainly attributed to the solar-induced thermal effect on the catalyst bed, boosting O3 decomposition (nearly a three-times enhancement from ∼0.18 gO3/g-hr for PPC to ∼0.52 gO3/g-hr for SEPPC) to generate more oxidative species (e.g., O-) and enhancing on-surface catalytic oxidation as well as the catalyst self-cleaning capacity at solar radiation-induced elevated temperatures this work provides a rational route to use abundant, renewable solar power for high performance, energy-efficient volatile organic compounds removal.Methyl 3-hydroxypropanoate(cas: 6149-41-3Quality Control of Methyl 3-hydroxypropanoate) was used in this study.

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. Quality Control of Methyl 3-hydroxypropanoate

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

《Characterization of volatile organic compounds emitted from endophytic Burkholderia cenocepacia ETR-B22 by SPME-GC-MS and their inhibitory activity against various plant fungal pathogens》 was written by Chen, Jian-Hua; Xiang, Wei; Cao, Ke-Xin; Lu, Xuan; Yao, Shao-Chang; Ding, Hung; Huang, Rong-Shao; Li, Liang-Bo. Recommanded Product: Methyl SalicylateThis research focused onvolatile organic endophytic burkholderia cenocepacia antifungal biocontrol; Burkholderia cenocepacia; antifungal activity; bacteria; biocontrol agents; volatile organic compounds. The article conveys some information:

The use of antagonistic microorganisms and their volatile organic compounds (VOCs) to control plant fungal pathogens is an eco-friendly and promising substitute for chem. fungicides. In this work, endophytic bacterium ETR-B22, isolated from the root of Sophora tonkinensis Gagnep., was found to exhibit strong antagonistic activity against 12 fungal pathogens found in agriculture. Strain ETR-B22 was identified as Burkholderia cenocepacia based on 16S rRNA and recA sequences. We evaluated the antifungal activity of VOCs emitted by ETR-B22. The VOCs from strain ETR-B22 also showed broad-spectrum antifungal activity against 12 fungal pathogens. The composition of the volatile profiles was analyzed based on headspace solid phase microextraction (HS-SPME) gas chromatog. coupled to mass spectrometry (GC-MS). Different extraction strategies for the SPME process significantly affected the extraction efficiency of the VOCs. Thirty-two different VOCs were identified. Among the VOC of ETR-B22, di-Me trisulfide, indole, Me anthranilate, Me salicylate, Me benzoate, benzyl propionate, benzyl acetate, 3,5-di-tert-butylphenol, allyl benzyl ether and nonanoic acid showed broad-spectrum antifungal activity, and are key inhibitory compounds produced by strain ETR-B22 against various fungal pathogens. Our results suggest that the endophytic strain ETR-B22 and its VOCs have high potential for use as biol. controls of plant fungal pathogens. The results came from multiple reactions, including the reaction of Methyl Salicylate(cas: 119-36-8Recommanded Product: Methyl Salicylate)

Methyl Salicylate(cas: 119-36-8) is a natural herbivore-induced plant volatile. It is a naturally occurring product in trees, legumes, exotic plants, vegetables, berries, and the primary constituent of the oil of wintergreen.Methyl Salicylate is produced from salicylic acid.Recommanded Product: Methyl Salicylate

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

《Methyl salicylate glycosides in some Italian varietal wines》 was written by Carlin, Silvia; Masuero, Domenico; Guella, Graziano; Vrhovsek, Urska; Mattivi, Fulvio. Quality Control of Methyl SalicylateThis research focused onwine methyl salicylate glycoside Italy; Verdicchio wine; gaultherin; glycosides; methyl salicylate; methyl salicylate canthoside A; methyl salicylate gentiobioside; methyl salicylate glucoside; methyl salicylate rutinoside; methyl salicylate sambubioside; violutoside. The article conveys some information:

Glycosides are ubiquitous plant secondary metabolites consisting of a non-sugar component called an aglycon, attached to one or more sugars. One of the most interesting aglycons in grapes and wine is Me salicylate (MeSA), an organic ester naturally produced by many plants, particularly wintergreens. To date, nine different MeSA glycosides from plants have been reported, mainly spread over the genera Gaultheria, Camellia, Polygala, Filipendula, and Passiflora. From a sensorial point of view, MeSA has a balsamic-sweet odor, known as Wintergreen. MeSA was found in Vitis riparia grapes, in Vitis vinifera sp. and in the Frontenac interspecific hybrid. We found that the MeSA glycosides content in Verdicchio wines and in some genetically related varieties (Trebbiano di Soave and Trebbiano di Lugana) was very high. In order to understand which glycosides were present in wine, the methanolic extract of Verdicchio wine was injected into a UPLC-Q-TOF-HDMS and compared to the extracts of different plants rich in such glycosides. Using pure standards, we confirmed the existence of two glycosides in wine: MeSA 2-O-β-D-glucoside and MeSA 2-O-β-D-xylopyranosyl (1-6) β-D-glucopyranoside (gaultherin). For the first time, we also tentatively identified other diglycosides in wine: MeSA 2-O-α-L-arabinopyranosyl (1-6)-β-D-glucopyranoside (violutoside) and MeSA 2-O-β-D-apiofuranosyl (1-6)-β-D-glucopyranoside (canthoside A), MeSA 2-O-β-D-glucopyranosyl (1-6)-O-β-D-glucopyranoside (gentiobioside) and MeSA 2-O-α-L-rhamnopyranosyl (1-6)-β-D-glucopyranoside (rutinoside). Some of these glycosides have been isolated from Gaultheria procumbens leaves by preparative liquid chromatog. and structurally annotated by 1H- and 13C-NMR anal. Two of the peaks isolated from Gaultheria procumbens leaves, namely MeSA sambubioside and MeSA sophoroside, were herein observed for the first time. Six MeSA glycosides were quantified in 64 Italian white wines, highlighting the peculiar content and pattern in Verdicchio wines and related cultivars. The total concentration in bound and free MeSA in Verdicchio wines varied in the range of 456-9796μg/L and 5.5-143μg/L, resp., while in the other wines the bound and free MeSA was below 363μg/L and 12μg/L, resp. As this compound’s olfactory threshold is between 50 and 100μg/L, our data support the hypothesis that Me salicylate can contribute to the balsamic scent, especially in old Verdicchio wines. The experimental part of the paper was very detailed, including the reaction process of Methyl Salicylate(cas: 119-36-8Quality Control of Methyl Salicylate)

Methyl Salicylate(cas: 119-36-8) is a natural herbivore-induced plant volatile. It is a naturally occurring product in trees, legumes, exotic plants, vegetables, berries, and the primary constituent of the oil of wintergreen.Methyl Salicylate is produced from salicylic acid.Quality Control of Methyl Salicylate

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