Tag: 200-300

Aroma profiles of green tea made with fresh tea leaves plucked in summer was written by Guo, Xiangyang;Ho, Chi-Tang;Schwab, Wilfried;Wan, Xiaochun. And the article was included in Food Chemistry in 2021.COA of Formula: C12H22O4 This article mentions the following:

There is a claim that fresh tea leaves plucked in summer (FTL-S) are not suitable for green tea processing, but there is no scientific evidence to support this claim. The aroma properties of green tea (GT-S) made with FTL-S were studied by the anal. of volatiles during process, coupled with odor activity value (OAV) determination The odor profiles of dry tea and tea infusion were investigated by sensory evaluation. The GT-S contained higher proportions of alcs., alkenes and heterocyclic compounds with strong fragrance and nutty odors as well as moderate floral odor in comparison with FTL-S. β-Damascenone and 2-ethyl-3,5-dimethylpyrazine with the OAV of 54,290 and 1.15, resp., were the aroma-active compounds imparting woody and nutty odors in GT-S, resp. Current study provides an alternative way to use FTL-S for green tea production, and we also found that L-theanine is an important aroma precursor for the formation of green tea aroma. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6COA of Formula: C12H22O4).

Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. 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. COA of Formula: C12H22O4

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

Synthesis of bifunctional hydroxamic acids as novel ligands for the hydrophilic stabilization of iron oxide nanoparticles was written by Hofmann, Andreas;Graf, Christina;Kung, Shih-Hao;Kim, Myeongseob;Peng, Xiaogang;El-Aama, Randa;Ruehl, Eckart. And the article was included in Synthesis in 2010.Application of 3903-40-0 This article mentions the following:

A general method for synthesizing bifunctional hydroxamates containing carboxylate or amino functionalities was reported. Various products from simple alkyl to complex dendrimer-like structures were described. Such mols. were used recently in ligand-exchange reactions for the hydrophilic stabilization of originally oleate-protected iron oxide nanoparticles. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Application of 3903-40-0).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Application of 3903-40-0

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

Transition-Metal-Free Deaminative Vinylation of Alkylamines was written by Hu, Jiefeng;Cheng, Bo;Yang, Xianyu;Loh, Teck-Peng. And the article was included in Advanced Synthesis & Catalysis in 2019.Application of 185619-66-3 This article mentions the following:

An efficient metal-free system, that was capable of activating the C-N bonds of Katritzky pyridinium salts I [R = 3,3-difluorocyclobutyl, cyclohexyl, PhCH₂CH(CO₂Me), etc.] derived from diverse alkylamines for deaminative vinylation to produce various olefins RCH=CHAr [Ar = Ph, 2-thienyl, 4-FC₆H₄, etc.]. The key to the high reactivity was the utilization of pyridinium salt-activated alkylamines I with a base as a promoter. The transformation exhibited good functional group compatibility and included inexpensive primary amine feedstocks and amino acids. The proposed method could serve as a powerful synthetic method for late-stage modification of complex compounds Mechanistic experiments suggestes that free radical processes are involved in this system. In the experiment, the researchers used many compounds, for example, tert-Butyl (3-ethynylphenyl)carbamate (cas: 185619-66-3Application of 185619-66-3).

tert-Butyl (3-ethynylphenyl)carbamate (cas: 185619-66-3) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Application of 185619-66-3

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

Trifluoroethanol as a Unique Additive for the Chemoselective Electrooxidation of Enamines to Access Unsymmetrically Substituted NH-Pyrroles was written by Baidya, Mrinmay;Maiti, Debabrata;Roy, Lisa;De Sarkar, Suman. And the article was included in Angewandte Chemie, International Edition in 2022.Product Details of 33166-79-9 This article mentions the following:

An electrochem. method for the synthesis of unsym. substituted NH-pyrroles is described. The synthetic strategy comprises a challenging heterocoupling between two structurally diverse enamines via sequential chemoselective oxidation, addition and cyclization processes. A series of aryl- and alkyl-substituted enamines were effectively cross-coupled from an equimolar mixture to synthesize various unsym. pyrrole derivatives in up to 84% yield. The desired cross-coupling was achieved by tuning the oxidation potential of the enamines by utilizing a “magic effect” of the additive trifluoroethanol (TFE). Addnl., extensive computational studies revealed the unique role of TFE in promoting the heterocoupling process by regulating the activation energies of the reaction steps through H-bonding and C-H···π interactions. Importantly, the developed electrochem. protocol was found to be equally efficient for the homocoupling of enamines to form sym. pyrroles in up to 92% yield. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Product Details of 33166-79-9).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. 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. Product Details of 33166-79-9

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

Synthesis, micellar structures and emission mechanisms of an AIE and DDED-featured fluorescent pH- and thermo-meter was written by Guo, He;Cheng, Xiaomeng;Li, Hongping;Li, Jun;Wei, Jinjin;Feng, Chongyang. And the article was included in RSC Advances in 2020.HPLC of Formula: 27249-90-7 This article mentions the following:

A new nanoprobe, the luminescent diblock copolymer PNIPAM(MAh-4)-b-P4VP (PN4P), with pH- and thermo-responsive deprotonation-driven emission decay (DDED) and aggregation-induced emission (AIE) features was designed and synthesized. The nanoprobe PN4P can form micellar structures in water with reversible dual-responsive fluorescence (FL) behavior within a wide pH range of 2-11. The critical solution temperature was found at about 32, 30 and 27°C as the pH switched from 2, 7 to 11. The critical pH value of the probe was about 4.0, and the micelles showed a core-shell inversion in response to pH and thermal stimuli, accompanied by a desirable emission tunability. P4VP as the micellar shell at pH = 2 was more easily dehydrated with the increase in temperature as compared to PNIPAM as the micellar shell at pH >4. The strongest dehydration of the P4VP shell would make PN4P the most strongly aggregated and the most AIE-active, which supports the 2.10-fold most distinguished thermal-responsive emission enhancement at pH = 2. Moreover, a dramatic acidochromic red shift of the emission band from 450 (pH > 4) to 490 nm (pH = 2) was observed, and the maximum emission at pH = 2 was enhanced by about 2.07-fold as compared with that at pH = 7. Therefore, the probe displays the desired dual responses and good reversibility. AIE and DDED are the two major mechanisms responsible for the dual-responsive emission change, with AIE playing a more important role than DDED. This work offers a promising approach to interpreting temperature (range from 28 to 40°C) and pH changes (range from 2 to 7) in water. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7HPLC of Formula: 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.HPLC of Formula: 27249-90-7

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

A mild, simple, and convenient synthesis of diesters from malonyl or succinyl dichloride and alcohols catalyzed by potassium tetracarbonylhydridoferrate, KHFe(CO)₄, as a new catalyst was written by Shim, Sang Chul;Huh, Keun Tae;Park, Woo Hyun. And the article was included in Synthesis in 1987.SDS of cas: 1190-39-2 This article mentions the following:

ROH (R = Me, Et, Me₂CH, Bu, pentyl) reacted with ClCO(CH₂)nCOCl (n = 1,2) in the presence of KHFe(CO)₄ under CO to give 62-97% RO₂C(CH₂)nCO₂R. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2SDS of cas: 1190-39-2).

malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.SDS of cas: 1190-39-2

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

Thermoresponsive block copolymer micelles with tunable pyrrolidone-based polymer cores: structure/property correlations and application as drug carriers was written by Sun, X.-L.;Tsai, P.-C.;Bhat, R.;Bonder, E. M.;Michniak-Kohn, B.;Pietrangelo, A.. And the article was included in Journal of Materials Chemistry B: Materials for Biology and Medicine in 2015.Recommanded Product: 27249-90-7 This article mentions the following:

A-B block copolymer micelles comprised of thermoresponsive hydrophilic PNIPAAm (poly(N-isopropylacrylamide)) coronae and hydrophobic PNP (poly(N-acryloyl-2-pyrrolidone)), PMNP (poly(N-acryloyl-5-methoxy-2-pyrrolidone)), or PBNP (poly(N-acryloyl-5-butoxy-2-pyrrolidone)) cores were examined to identify how systematic adjustments to core-segment structure affect micellar physicochem. properties, drug loading efficiency (DLE), and thermoresponsive drug release among these novel systems. Critical micelle concentrations (CMCs) were found to decrease by 2 orders of magnitude in the order of PNIPAAm-PNP, PNIPAAm-PMNP, and PNIPAAm-PBNP indicating that minor modifications to the pyrrolidone scaffold significantly affect its hydrophobic character. Moreover, the structural modifications were also found to influence micelle size and intermicellar aggregation that occurs above the lower critical solution temperature (LCST). In line with the CMC data, DLE values of doxorubicin-loaded (i.e., DOX-loaded) micelles increase in the order of PNIPAAm-PNP, PNIPAAm-PMNP, and PNIPAAm-PBNP, a trend attributed to enhanced cohesive forces (i.e. London dispersion forces) between DOX and core as the latter becomes more hydrophobic. When heated above the LCST, DOX release decreases in the order of PNIPAAm-PNP, PNIPAAm-PMNP, and PNIPAAm-PBNP suggesting that release processes are impeded by the cohesive forces responsible for efficient encapsulation. Finally, cytotoxicity assays performed above the LCST reveal that DOX-loaded micelles are as cytotoxic as the free drug in formulations where DOX concentrations are equivalent In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Recommanded Product: 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Recommanded Product: 27249-90-7

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

Nanovesicular MOF with Omniphilic Porosity: Bimodal Functionality for White-Light Emission and Photocatalysis by Dye Encapsulation was written by Samanta, Debabrata;Verma, Parul;Roy, Syamantak;Maji, Tapas Kumar. And the article was included in ACS Applied Materials & Interfaces in 2018.Application In Synthesis of Dimethyl 5-ethynylisophthalate This article mentions the following:

A new π-chromophoric and asym. bola-amphiphilic oligo-(p-phenylene ethynylene)-based tetracarboxylate (OPE-TC1) linker was designed, synthesized, and self-assembled with Zn(OAc)₂. The resulting nanoscale metal-organic framework (MOF) {Zn₂(OPE-TC1)}_n (NMOF-1) showed a vesicular morphol. and permanent porosity with omniphilic pore surface. NMOF-1 showed cyan emission with high quantum efficiency (49%). The omniphilicity of the pore was used to incorporate ambipolar dye sulforhodamine G (SRG) to tune the band gap as well as to get pure white-light emission. Also, the polar pore surface of NMOF-1 allowed facile diffusion of the substrate for efficient photocatalytic activity. The dye-encapsulated framework further showed enhanced dihydrogen production by 1.75-fold compared to that from the as-synthesized NMOF-1 because of the modulated band gap and high excited state lifetime. As a control experiment, the authors synthesized a MOF (MOF-OMe) with an OPE-TC2 linker having -OMe functional groups that did not show nanoscale architecture. This suggested the important role of unsym. bola-amphiphilicity in nanostructuring. This rational design of a chromophoric linker resulted in a nanoscale MOF with omniphilic porosity to achieve bimodal functionality in clean energy applications. In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5Application In Synthesis of Dimethyl 5-ethynylisophthalate).

Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Application In Synthesis of Dimethyl 5-ethynylisophthalate

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

Regioselective reaction of fluorinated aryllithium reagents and carbon disulfide in cyclopentyl methyl ether: Efficient synthesis of dithioesters and liquid crystal compounds having a difluoromethyleneoxy moiety was written by Maebayashi, Haruki;Araki, Keisuke;Fuchigami, Tsugumichi;Gotoh, Yasuyuki;Inoue, Munenori. And the article was included in Journal of Fluorine Chemistry in 2020.Synthetic Route of C14H12S2 This article mentions the following:

Regioselective reaction (carbophilic over thiophilic attack) of several (o-fluorophenyl)lithium reagents RLi (R = Ph, 2,6-difluorophenyl, 2,3,4,5-tetrafluorophenyl, etc.) with carbon disulfide was achieved to furnish dithioesters RC(S)SCH2C6H5in good yields after alkylation, which are useful precursors of liquid crystal compound (I) having a difluoromethyleneoxy (-CF2O-) group. Running the reaction in the presence of a copper(I) salt catalyst and cyclopentyl Me ether as a solvent is optimal. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Synthetic Route of C14H12S2).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. 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. Synthetic Route of C14H12S2

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

Evaluation of the Oxidation of Rice Husks with Sodium Hypochlorite Using Gas Chromatography-Mass Spectrometry and Direct Analysis in Real Time-Mass Spectrometry was written by Wang, Shou-Ze;Fan, Xing;Zheng, Ai-Li;Lu, Yao;Wei, Xian-Yong;Zhao, Yun-Peng;Wang, Rui-Yu;Dou, You-Quan;Wang, Ying-Hua;Wang, Chu-Fan;Zhang, Fan;Shen, Yong;Li, Chun-Yan;Liu, Zheng;Liu, De-Ying. And the article was included in Analytical Letters in 2014.Application In Synthesis of Dimethyl decanedioate This article mentions the following:

Rice husk powder was oxidized in aqueous sodium hypochlorite solution under mild conditions with different reaction times. Fourier transform IR spectroscopy, gas chromatog.-mass spectrometry (GC-MS), and direct anal. in real time-mass spectrometry (DART-MS) were used to analyze the oxidation products. Results showed that oxidation was a feasible way to depolymerize the macromols. in the biomass and convert hydroxyl groups to carboxyl groups. In total, 113 organic compounds in oxidation products with mol. mass less than 500 Da were identified using GC-MS. As an ambient ionization technique, DART-MS was applied to the determination of biomass derivatives and revealed mass distribution and mol. structure information for the rice husk oxidation products. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Application In Synthesis of Dimethyl decanedioate).

Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Application In Synthesis of Dimethyl decanedioate

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