Category: 638-02-8

Quantitative analysis of Toona sinensis aroma components and variation rule during hot air dry process was written by Guo, Wei-yun;Li, Guang-hui;Zhang, Zhen-zhen;Lu, Fang;Yu, Xiao-na. And the article was included in Shipin Yanjiu Yu Kaifa in 2021.SDS of cas: 638-02-8 The following contents are mentioned in the article:

The aim of the study was to establish the quant. method for Toona sinensis aroma components and explore its changes during processing. The organic solvent extraction and gas chromatog.-mass spectrometry (GC-MS) was used to anal. the characteristic aroma components of Toona sinensis and the change rules of three characteristic aroma components at the hot air drying temperatures Results showed that the order of the extraction effect of the four extractants was acetonitrile, Et acetate, ethanol and n-hexane, and the order of the purification effect of the three purification agents was pesticarb (PC), octadecylsilyl (ODS) and primary secondary amine (PSA). The best extraction agent for the pretreatment of Toona sinensis was acetonitrile, and the best purification agent was PC. The contents of 3, 4-dimethylthiophene, inverse 2-hexenal and 2, 5-dimethylthiophene decreased in general, but the trend and amplitude were not the same. The content of 3, 4-dimethylthiophene decreased by 15.08% during 4 h drying. The content of 2, 5-dimethylthiophene varied greatly, reaching 89.75%. It could be seen that there were precursors in Toona sinensis from the change trend of the three target substances. The thermal effect would promote the decomposition and transformation of these precursors to the target substances, but the extension of drying time would promote the continuous loss of the target materials. The sensory evaluation test showed that the sensory quality of Toona sinensis was better when the hot air drying temperature was 50°C and the hot air drying time was 2 h. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8SDS of cas: 638-02-8).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene is used as starting material for the synthesis of bioactive molecules. The core structure is a part of various pharmaceutical substances and natural products. The different substitution patterns in these heterocycles offer new opportunities for drug discovery and other applications in materials science.SDS of cas: 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

The Effects of Antioxidants on the Changes in Volatile Compounds in Heated Welsh Onions (Allium fistulosum L.) during Storage was written by Lee, Sang Mi;Kim, Dami;Kim, Young-Suk. And the article was included in Molecules in 2022.COA of Formula: C6H8S The following contents are mentioned in the article:

Welsh onion (Allium fistulosum L.) is usually used to enhance the flavor characteristics of various foods. Volatile compounds in Welsh onions, including sulfur-containing compounds, may vary during heat process and storage. Accordingly, the changes in the volatile compounds in Welsh onions, subjected to heat and antioxidant (ascorbic acid and glutathione) treatments during storage, are investigated in the present study. The majority of sulfur-containing compounds in Welsh onions showed significant differences between the untreated Welsh onions and heated Welsh onions. During the heating of the Welsh onions, some sulfur-containing compounds, such as 2-methylthiirane, 1-(methyldisulfanyl)prop-1-ene, 1-[[(E)-prop-1-enyl]disulfanyl]propane, 1-(propyltrisulfanyl)propane, 1-[[(E)-prop-1-enyl]trisulfanyl]propane, and (methyltetrasulfanyl)methane, showed significant differences between the untreated and heated Welsh onions (p < 0.05). In addition, partial least square discriminant anal. (PLS-DA) was applied to discriminate the heated Welsh onion samples added with different antioxidants. The heated Welsh onion samples added with ascorbic acid was mainly associated with 2-phenylacetaldehyde, acetic acid, methylsulfanylmethane, prop-2-ene-1-thiol, undecan-2-one, and (2E,4E)-deca-2,4-dienal. Moreover, the key volatile compounds in the heated Welsh onion samples added with glutathione were 3-ethylthiophene, 1-(methyldisulfanyl)-1-methylsulfanylpropane, 1-methylsulfanylpentane, 2-prop-2-enylsulfanylpropane, and 1-propan-2-ylsulfanylbutane. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8COA of Formula: C6H8S).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Functionalized benzothiophenes are important constructs found in molecules with wide ranging biological activity and in organic materials. The different substitution patterns in these heterocycles offer new opportunities for drug discovery and other applications in materials science.COA of Formula: C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Pervaporative removal of organosulfur compounds (OSCs) from gasoline using PEBA and PDMS based commercial hydrophobic membranes was written by Rychlewska, Katarzyna;Kujawski, Wojciech;Konieczny, Krystyna. And the article was included in Chemical Engineering Journal (Amsterdam, Netherlands) in 2017.Recommanded Product: 638-02-8 The following contents are mentioned in the article:

Vacuum pervaporation experiments were conducted to recognize the efficiency of organosulfur compounds (OSCs) separation from gasoline using com. hydrophobic membranes. Three of typically presented in gasoline sulfur species, i.e. thiophene, 2-methylthiophene and 2,5-dimethylthiophene, were selected to investigate the different sulfur compounds removal efficiency from n-octane/sulfur species used as a model gasoline. The influence of process parameters such as feed temperature, feed concentration on OSCs removal from model n-octane/sulfur compound mixtures was also examined During the test, the com. hydrophobic PEBA-based and PDMS-based composite membranes were applied. Conducted experiments with chosen sulfur species confirmed that the structure of a component and the resulting differences in the affinity toward tested membrane and physico-chem. properties can influence the membrane performance and led to different separation efficiency. Total fluxes for n-octane/thiophene, n-octane/2-methylthiophene and octane/2,5-dimethylthiophene mixtures at 30 °C were equal to be 1.33, 1.42 and 1.29 kg/m² h in case of PEBA membrane and 7.21, 7.48 and 7.34 kg/m² h for PDMS-base membrane, with the corresponding separation factor β values of 7.04, 3.95 and 1.25 for PEBA and 2.95, 1.56 and 1.01 for PDMS, resp. The intrinsic selectivity for thiophene/n-octane mixture (α_T/O) also indicated that PEBA membrane (α_T/O ≈ 18) is much more selective than PDMS one (α_T/O ≈ 7.5). This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Recommanded Product: 638-02-8).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Functionalized benzothiophenes are important constructs found in molecules with wide ranging biological activity and in organic materials. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, and sertaconazole, and also BTCP.Recommanded Product: 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Fractionation of Lignin with Decreased Heterogeneity: Based on a Detailed Characteristics Study of Sequentially Extracted Softwood Kraft Lignin was written by Liu, Rui;Smeds, Annika;Wang, Luyao;Pranovich, Andrey;Hemming, Jarl;Willfor, Stefan;Zhang, Hongbo;Xu, Chunlin. And the article was included in ACS Sustainable Chemistry & Engineering in 2021.Synthetic Route of C6H8S The following contents are mentioned in the article:

Industrial lignin fractionation is attracting increasing interest due to its enormous potential in the development of high value-added materials. However, the widely reported fractionation approaches are primarily focused on the separation of fractions with a low polydispersity index (PDI). In this study, based on the detailed characteristic examination of carefully sequential-extracted softwood Kraft lignin fractions, a novel method to isolate lignin fraction with decreased heterogeneity (LGF-dh), was established in consideration of impurities, elemental composition, molar mass distribution, carbohydrate content, functional hydroxyl content, and the content of lignin-relevant aromatic units. To characterize the mentioned properties, an elemental analyzer, SEC-MALS, GC-MS, GC-FID, Py/GC-MS, ³¹P-NMR, and HSQC-NMR were used to compare the differences of the sequential lignin fractions that were obtained by Me tert-Bu ether (MTBE), Et acetate (EtOAc), ethanol (EtOH), methanol (MeOH), acetone, and dioxane. Moreover, a practical and feasible three-step extraction process was proposed to sep. the low heterogeneity lignin fraction from industrial lignin according to the different solubilities of each fraction in the green cosolvent system of EtOH/water, MeOH/water, and acetone/water. Overall, this work presented a comprehensive study on the properties of softwood lignin as well as proposed a feasible and convenient method to reduce the heterogeneity of lignin, which would promote its valorization. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Synthetic Route of C6H8S).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene is relatively a stable molecule. The electrophilic substitution of benzothiophene systems is much less regioselective than that of indoles. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.Synthetic Route of C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Effect of sulfide group on the network structure and thermal behavior of sulfur-containing polybenzoxazines: Examining by using Py-GC-MS and TGA-FTIR was written by Ya, Lyu;Qiu, Liliang. And the article was included in Polymer Degradation and Stability in 2022.Application of 638-02-8 The following contents are mentioned in the article:

In the present paper, two sulfur-containing benzoxazine monomers were synthesized using 2-thiophenemethylamine as an amine source. The polymerization behaviors of the two monomers were compared with those of aniline and furfurylamine using differential scanning calorimetry (DSC), which revealed that the polymerization temperatures of the synthesized monomers were between those of aniline and furfurylamine. Thermogravimetric anal. (TGA) confirmed that the polybenzoxazines formed from the synthesized monomers had outstanding thermal stability. Pyrolysis-gas chromatog.-mass spectrometry (Py-GC-MS) and TGA-Fourier-transform IR spectroscopy (TGA-FTIR) were used to monitor the decomposition processes of the polymers. They allowed us to analyze the crosslinked structures of the polybenzoxazines and revealed the probable cause of their thermal stability. We found that the reliability of the thioether bonds and the di-substituted structures formed in the polybenzoxazines based on furfurylamine and thiophenemethylamine ensured the stability of the crosslinked structures. The methyl-substituted ring structures exposed by fracture react with the ammonia released at higher temperatures to form CN groups. Therefore, nitrogen is retained in the crosslinked structures and the thermal stability of the polymers is improved. Compared with common halogen- or phosphorus-containing flame-retardant polymers, the newly developed sulfur-containing polybenzoxazines are more environmentally friendly flame-retardant polymers. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Application of 638-02-8).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene is a fused ring compound of thiophene ring and benzene ring, which is an important class of heterocycles with advantageous structures. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.Application of 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Volatile profiles of Allium tenuissimum L. flower fried by four different oils, using SPME-GC-MS, and sensory evaluation coupled with partial least squares regression was written by Zhang, Chenping;Wang, Yutong;Ding, Danyang;Su, Jin;Zhao, Zhigang. And the article was included in Journal of Food Composition and Analysis in 2022.Related Products of 638-02-8 The following contents are mentioned in the article:

Allium tenuissimum L. flower is a kind of spice widely used in Northwest China, which is more fragrant after being fried. In order to assess the volatile compounds of fried Allium tenuissimum flower, solid-phase microextraction with gas chromatog.-mass spectrometry (SPME-GC-MS) and gas chromatog.-olfactometry (GC-O) were used to analyze the flower of Allium tenuissimum L. fried in four kinds of oil (rapeseed oil, peanut oil, soybean oil, and sunflower oil). A total of 50 volatiles were identified, including eight sulfur-containing compounds, ten nitrogen-containing heterocyclics, seven oxygen-containing heterocycles, eleven aldehydes, six acids and eight other compounds Sensory evaluation revealed highest scores in onion, caramel, grassy, fatty and roasty attributes. Pos. correlations between sensory attributes and aroma-active compounds were elaborated by partial least squares regression (PLSR) anal. PLSR indicated that the sensory attribute of ‘roasted’ was pos. associated with methylpyrazine, 2,5-dimethylpyrazine, and 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one. The sensory attribute of ‘onion’ was significant pos. associated with di-Me disulfide and di-Me trisulfide. 2-Pentylfuran, furfural, and 2-furanmethanol had a significant pos. impact on ‘caramel’ attribute. (E)-2-Heptenal and (E,E)-2,4-heptadienal were pos. related to ‘grassy’ attribute. ‘Fatty’ attribute was significantly pos. correlated with (E,E)-2,4-nonadienal, (E,E)-2,4-decadienal, and heptanoic acid. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Related Products of 638-02-8).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene scaffolds are of great importance due to its increased presence in bioactive molecules. It is also used in the manufacturing of dyes such as thioindigo.Related Products of 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Biosynthesis of pleasant aroma by enokitake (Flammulina velutipes) with a potential use in a novel tea drink was written by Rigling, Marina;Yadav, Mayuri;Yagishita, Manami;Nedele, Ann-Kathrin;Sun, Jinyuan;Zhang, Yanyan. And the article was included in LWT–Food Science and Technology in 2021.Name: 2,5-Dimethylthiophene The following contents are mentioned in the article:

Western consumers prefer tea products with little or no green flavor. Accordingly, edible basidiomycetes have been addressed as an innovative tool to naturally aromatize tea infusion to mask or reduce green flavor. After submerged fermentation of green tea infusion with basidiomycetes, multiple pleasant odor impressions were perceived which significantly differed from the characteristic green and floral odor of the substrate. Among twenty-nine screened fungi, enokitake (Flammulina velutipes) was regarded as an ideal species to potentially drive a sensorial tea drink because of its appealing nutty and chocolate-like flavor and a rapid fermentation process (16 h). To better understand flavor formation during fermentation as perceived by sensory evaluation, the flavor profile was decoded by direct immersion – stir bar sorptive extraction – gas chromatog. – mass spectrometry – olfactometry. During the fermentation, a series of key odorants of the non-fermented tea infusion imparting green and floral were decreased, while compounds responsible for the nutty and chocolate-like aroma increased. Enokitake biosynthesized the sensory-relevant compound 2-ethyl-3,5-dimethylpyrazine, which has not been reported in basidiomycetes yet. We assume that vitamin B1 and sodium acetate are potential precursors in enokitake. In parallel, the accumulation of various alkylpyrazines (2,5-dimethylpyrazine, 2,3,5-trimethylpyrazine, and 2-ethyl-3,6-dimethylpyrazine) has been observed as well. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Name: 2,5-Dimethylthiophene).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene is used as starting material for the synthesis of bioactive molecules. The core structure is a part of various pharmaceutical substances and natural products. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, and sertaconazole, and also BTCP.Name: 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Volatile compounds of pastirma under different curing processes was written by Hazar, Fatma Yagmur;Kaban, Guezin;Kaya, Muekerrem. And the article was included in Journal of Food Processing and Preservation in 2019.Formula: C6H8S The following contents are mentioned in the article:

The effects of different curing processes (curing temperature 4°C or 10°C and curing agent 150 mg/kg nitrite or 300 mg/kg nitrate) on the volatile compound profile of the pastirma (Turkish dry-cured meat product) have been investigated. A total of 45 volatile compounds, including alcs., aldehydes, ketones, aliphatic and aromatic hydrocarbons, terpenes, sulfur compounds, esters, furans and nitrogenous compounds have been identified in pastirma samples. The curing temperature did not have a significant effect on any compound The curing agent had statistically a significant or very significant influence on 12 compounds In general, the use of nitrate increased the amount of volatile compound However, lower mean hexanal value was determined in pastirma samples cured with nitrite than those cured with nitrate. Practical applications : Pastirma is a traditional dry-cured meat product. It is produced from whole muscle and/or mucsles of certain parts of beef or water buffalo carcasses. In curing stage, nitrate was used generally. However, nitrite can be used alone or with nitrate in this stage. In this study, the effects of different curing conditions (150 mg/kg nitrite or 300 mg/kg nitrate and 4°C or 10°C) on volatile compounds of pastirma were investigated. According to the results, pastirma produced with nitrate generally showed higher amounts of volatile compounds On the other hand, curing temperature was not significant factor in terms of volatile compounds This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Formula: C6H8S).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophenes are valuable heterocycles that are widely used in medicines, agrochemicals, and materials science. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, and sertaconazole, and also BTCP.Formula: C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Effect of naphtha diluent on greenhouse gases and reduced sulfur compounds emissions from oil sands tailings was written by Gee, Kathleen F.;Poon, Ho Yin;Hashisho, Zaher;Ulrich, Ania C.. And the article was included in Science of the Total Environment in 2017.Category: benzothiophene The following contents are mentioned in the article:

The long-term storage of oil sands tailings has resulted in the evolution of greenhouse gases (CH₄ and CO₂) as a result of residual organics biodegradation Recent studies have identified black, sulfidic zones below the tailings-water interface, which may be producing toxic sulfur-containing gases. An anaerobic mesocosm study was conducted over an 11-wk period to characterize the evolution of CH₄, CO₂ and reduced sulfur compounds (RSCs) (including H₂S) in tailings as it relates to naphtha-containing diluent concentrations (0.2, 0.8, and 1.5% w/v) and microbial activity. Our results showed that RSCs were produced first at 0.12 μmol°RSCs/mL MFT (1.5% w/v diluent treatment). RSCs contribution (from highest to lowest) was H₂S and 2-methylthiophene > 2.5-dimethylthiophene > 3-methylthiophene > thiofuran > Bu mercaptan > carbonyl sulfide, where H₂S and 2-methylthiophene contributed 81% of the gas produced. CH₄ and CO₂ production occurred after week 5 at 40.7 μmol CH₄/mL MFT and 5.9 μmol CO₂/mL MFT (1.5% w/v diluent treatment). The amount of H₂S and CH₄ generated is correlated to the amount of diluent present and to microbial activity as shown by corresponding increases in sulfate-reducers’ Dissimilatory sulfite reductase (DsrAB) gene and methanogens’ methyl-coenzyme M reductase (MCR) gene. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Category: benzothiophene).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene scaffolds are of great importance due to its increased presence in bioactive molecules. It has been used as a raw material for the synthesis of biologically active structures and is found in pharmaceuticals such as leukotriene synthesis inhibitors and antifungals, as well as in many natural products.Category: benzothiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Fused-Ring Nonfullerene Acceptor Forming Interpenetrating J-Architecture for Fullerene-Free Polymer Solar Cells was written by Yan, Dong;Liu, Wenxu;Yao, Jiannian;Zhan, Chuanlang. And the article was included in Advanced Energy Materials in 2018.HPLC of Formula: 638-02-8 The following contents are mentioned in the article:

An interesting and important question emerges with the rapid advances of the highly efficient fused-ring nonfullerene acceptors; i.e., how the acceptor mols. form aggregates in its blended film with a donor polymer/small mol. so as to offer highly efficient exciton diffusion and electron transport. To answer this question, a new acceptor mol., 3,9-bis(5-methylene-4-one-6-(1,1-dicyanomethylene)-cyclopenta[c]thiophen-2,8-dimethyl)-5,5,11,11-tetrakis(4-n-hexylphenyl)-dithieno[2,3-d:2′,3′-d’]-s-indaceno[1,2-b:5,6-b’]dithiophene (ITCT-DM), is designed and synthesized herein and its unique interpenetrating J-architecture is presented in which the acceptor mols. form compacted and displaced ππ-stacks with the distances of 3.1-4.2 Ǻ. Again the crystal structure data are correlated with the grazing-incidence X-ray diffraction (GIXRD) data of the pure acceptor and its polymer:acceptor blended films, which gives a clearer picture about the origins of the acceptor’s GIXRD signals in both the pure and its blended films. Again, these results unveil the key roles of the uses of 1,8-diiodooctane (DIO) and thermal annealing treatment in optimizing the acceptor phase morphologies in the donor:acceptor blended film, and the combination of the thermal annealing and DIO treatment leads to obtain higher crystallinity for both the donor and acceptor phases, more compacted packing, and finer morphologies. A power conversion efficiency of 10.5% is obtained. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8HPLC of Formula: 638-02-8).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene is used as starting material for the synthesis of bioactive molecules. The core structure is a part of various pharmaceutical substances and natural products. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.HPLC of Formula: 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem