Month: November 2022

Prediction of flash points of pure organic compounds: Evaluation of the DIPPR database was written by Alibakhshi, A.;Mirshahvalad, H.;Alibakhshi, S.. And the article was included in Process Safety and Environmental Protection in 2017.Formula: C6H8S The following contents are mentioned in the article:

The flash point is one of the most important flammability properties of compounds for the design of inherently safe processes. Many models have been developed to predict the flash point using the DIPPR database. However, for only 740 of the 1628 organic compounds available in the DIPPR database, the data for both flash point and normal b.p. were exptl. determined For the other compounds, at least one of these properties was predicted and therefore is not appropriate for model development. The present study introduces a model to predict the flash points of pure organic compounds using their mol. structures and normal b.ps. The new model exploits the equality of the relative errors observed for the normal b.p. and flash point values predicted using the Joback method. Consequently, the relative error of the predicted normal b.ps. can be used as a scaling factor to modify the predicted flash points. The ability of the model to evaluate the accuracy of a database was investigated. The ratio of the relative error of the predicted flash point to the relative error of the predicted normal b.p. obtained using the Joback method was proposed as a measure to evaluate the accuracy of flash point data. 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. 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.Formula: C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Impact of processing on odour-active compounds of a mixed tomato-onion puree was written by Koutidou, Maria;Grauwet, Tara;Van Loey, Ann;Acharya, Parag. And the article was included in Food Chemistry in 2017.Quality Control of 2,5-Dimethylthiophene The following contents are mentioned in the article:

Gas chromatog.-olfactometry revealed thirty-two odor-active compounds in a heat-processed tomato-onion puree, among which twenty-seven were identified by gas chromatog.-olfactometry-mass spectrometry (GC-O-MS) and comprehensive two-dimensional gas chromatog. coupled with time-of-flight mass spectrometry (GC × GC-TOF MS). Based on the results of two olfactometric methods, i.e. detection frequency and aroma extract dilution anal., the most potent aroma components include: di-Pr disulfide, S-Pr thioacetate, di-Me trisulfide, 1-octen-3-one, methional, di-Pr trisulfide, 4,5-dimethylthiazole, 2-phenylacetaldehyde and sotolone. Processing of mixed vegetable systems can add complexity in their aroma profiles due to (bio)chem. interactions between the components. Therefore, the impact of different processing steps (i.e. thermal blanching, all-in-one and split-stream processes) on the volatile profile and aroma of a mixed tomato-onion puree has been investigated using a GC-MS fingerprinting approach. Results showed the potential to control the aroma in a mixed tomato-onion system through process-induced enzymic modulations for producing tomato-onion food products with distinct aroma characteristics. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Quality Control of 2,5-Dimethylthiophene).

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. It is found within the chemical structures of pharmaceutical drugs such as raloxifene, zileuton, and sertaconazole, and also BTCP.Quality Control of 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Flow injection gas chromatography with sulfur chemiluminescence detection for the analysis of total sulfur in complex hydrocarbon matrixes was written by Hua, Yujuan;Hawryluk, Myron;Gras, Ronda;Shearer, Randall;Luong, Jim. And the article was included in Journal of Separation Science in 2018.Application In Synthesis of 2,5-Dimethylthiophene The following contents are mentioned in the article:

A fast and reliable anal. technique for the determination of total sulfur levels in complex hydrocarbon matrixes is introduced. The method employed flow injection technique using a gas chromatograph as a sample introduction device and a gas phase dual-plasma sulfur chemiluminescence detector for sulfur quantification. Using the technique described, total sulfur measurement in challenging hydrocarbon matrixes can be achieved in <10 s with sample-to-sample time <2 min. The high degree of selectivity and sensitivity toward sulfur compounds of the detector offers the ability to measure low sulfur levels with a detection limit in the range of 20 ppb weight/weight S. The equimolar response characteristic of the detector allows the quantitation of unknown sulfur compounds and simplifies the calibration process. Response is linear over a concentration range of five orders of magnitude, with a high degree of repeatability. The detector’s lack of response to hydrocarbons enables direct anal. without the need for time-consuming sample preparation and chromatog. separation processes. This flow injection-based sulfur chemiluminescence detection technique is ideal for fast anal. or trace sulfur anal. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Application In Synthesis of 2,5-Dimethylthiophene).

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. It is found within the chemical structures of pharmaceutical drugs such as zileuton, raloxifene, and sertaconazole, and also BTCP.Application In Synthesis of 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Solid Phase Micro-extraction – Gas Chromatography-Mass Spectrometry to Characterize Pyrolysis Products from Textiles was written by Goltz, Douglas M.;Bradford, Brock H.;Ahmadi, Shokoufeh;Henderson, Anna R. P.;Duffy, Stephen J.. And the article was included in Analytical Letters in 2017.Recommanded Product: 2,5-Dimethylthiophene The following contents are mentioned in the article:

Headspace solid phase micro-extraction gas chromatog.-mass spectrometry (HS-SPME GC-MS) was used for identifying thermally labile volatile compounds from cotton, wool, polyester, olefin, silk, and acrylic. Volatile compounds were generated from the textiles using a pyrolysis apparatus prior to GC-MS. Pyrolysis temperatures ranged from 190 to 550°C. Each textile displayed a unique chromatogram containing compounds that were consistent with the chem. structure of the textile. Exptl. parameters that were investigated included the temperature, sample size, and sampling time to determine their effect on the number and intensity of peaks in the chromatograms as well as to identify optimum conditions for anal. Heating of each sample was achieved using a resistively heated Pt wire. Full pyrolysis at 550°C of the textiles appeared to give the best results in terms of peak height relative to background. A range of sample sizes (0.02-1.5 mg) were used and, generally, ≤0.02 mg was used for identifying the textiles. The reproducibility of retention times for selected compounds in the chromatograms was less than 1% relative standard deviation. The combination with mass spectrometry provided valuable structural information. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Recommanded Product: 2,5-Dimethylthiophene).

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. The different substitution patterns in these heterocycles offer new opportunities for drug discovery and other applications in materials science.Recommanded Product: 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Meat flavor generation from different composition patterns of initial Maillard stage intermediates formed in heated cysteine-xylose-glycine reaction systems was written by Zhao, Jian;Wang, Tianze;Xie, Jianchun;Xiao, Qunfei;Du, Wenbin;Wang, Yaxin;Cheng, Jie;Wang, Shi. And the article was included in Food Chemistry in 2019.Product Details of 638-02-8 The following contents are mentioned in the article:

Volatile compounds formed in model reactions involving synthesized initial Maillard intermediates Gly-Amadori and [¹³C₅]-2-threityl-thiazolidine-4-carboxylic acids ([¹³C₅]-TTCA) in different molar ratios and free cysteine and glycine were investigated by solid-phase microextraction/gas chromatog.-mass spectrometry and gas chromatog.-olfactometry. The 1:1 ratio composition pattern provided the highest yields of all the sulfur-containing compounds, the potent meaty flavors or their ¹³C-labeled/unlabeled fractions, indicating a moderate level of glycine relative to cysteine was optimum for maximally yielding meaty flavors in complex meat-like Maillard systems containing cysteine as well as glycine. In addition, the 1:1 ratio composition led to formation of ¹³C-labeled mols. of some key meaty flavors e.g. 2-furanthiol representing over 70%, indicating TTCA/glycine reaction was better than Gly-Amadori/cysteine to yield meaty flavors. Formation pathways of twenty-nine flavors were elucidated based on the detected isotope distribution patterns. In particular, 2-methyltetrahydrothiophen-3-one, 3-thiophenethiol, 2-ethylthiophene, 2,5-dimethylthiophene, and 5-methylthiophene-2-carboxaldehyde involved a new formation pathway. Thiophene-2-carboxaldehyde and 2-methylthieno[3,2-b]thiophene showed two formation pathways. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Product Details 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.Product Details of 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Efficacy of some conventional fungicides and essential oils against tomato early blight disease was written by Abdel-Aty, Ahmed S.;Abdallah, Elsayed A. M.;Kaduos, Ezzat A.;Gad, Mohamed R. A.. And the article was included in World Journal of Advanced Research and Reviews in 2021.Recommanded Product: 2,5-Dimethylthiophene The following contents are mentioned in the article:

Fungicidal activity of nine selected conventional fungicides, identified five plant oils and their combined effect against A. solani, the causal pathogen of early blight on tomato. GC-MS anal. of the tested oils indicated that terpene hydrocarbons (97%) with cinnamaldehyde as the major compound; sulfur compounds; fatty acids and organo-sulfur-containing compounds were the main components in cinnamon, garlic, mustard and onion oils, resp. In vitro, Speedcide (difenoconazole) and Cabrioduo (Dimethomorph + Pyraclostrobin) were the most effective against the A. solani fungus with EC50 values of 94.6 and 88.6 ppm resp. Toledo (Tebuconzole) achieved EC50 value of 631.2 ppm. Roxyl-M was significantly more effective than Roxyl-plus or Remik. Speedcide alone or mixed with mandipropamid or azoxystrobin in Revus-Top or Cruze were the lowest effective in vitro. Garlic and mustard oils were more effective in liquid media than solid one. Cinnamon, onion, garlic and bitter almond oils caused moderate fungi-toxicity against early blight pathogen and could be implemented in the IPM program. Lower EC50 values were obtained in case of combinations of fungicides with oils than sep. treatments. Effect of the active conventional fungicides and plant oils on disease indexes, relative disease control, chlorophyll content, sugar contents and poly phenol oxidase in tomato plants was also studied. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Recommanded Product: 2,5-Dimethylthiophene).

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 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.Recommanded Product: 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Determination of highly volatile compounds in fresh onion (Allium cepa L.) by room-temperature enrichment headspace-trap coupled to cryotrapping GC-MS was written by Liu, Mengpan;Su, Yue;Guo, Yinlong. And the article was included in Separation Science plus in 2018.Safety of 2,5-Dimethylthiophene The following contents are mentioned in the article:

Conventional headspace-based anal. is not suitable for identifying volatile compounds in fresh onion (Allium cepa L.) because large amounts of water vapor could affect the determination of target compounds A headspace-trap was introduced to remove water vapor and keep the analytes in the trap tube. Addnl., the headspace-trap method based on room-temperature enrichment could prevent enzyme-sensitive samples from denaturing to maintain the original flavor compositions of the samples. Moreover, the highly volatile compounds were poorly separated after headspace extraction By using a cryotrapping device, these compounds were well separated Therefore, a room-temperature enrichment headspace-trap cryotrapping gas chromatog. with mass spectrometric method was established for the determination of volatile compounds in fresh onion. With this method, a total of 73 volatile compounds were identified by mass spectral search and retention index. Among them, 29 highly volatile compounds were successfully separated before the retention time of 5 min, and these compounds contributed significantly to the smell of onion. The volatile compounds were dominated by di-Pr disulfide (35.42%), 1,2-dithiolane (15.82%), 1-propanethiol (11.74%) and propanal (11.23%). The results indicated that the proposed method was an effective tool for analyzing volatile compounds in high-water-content fresh onion samples. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Safety of 2,5-Dimethylthiophene).

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 also used in the manufacturing of dyes such as thioindigo.Safety of 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Rubber pyrolysis: Kinetic modeling and vulcanization effects was written by Liu, Sheng;Yu, Jie;Bikane, Kagiso;Chen, Tao;Ma, Chuan;Wang, Ben;Sun, Lushi. And the article was included in Energy (Oxford, United Kingdom) in 2018.Safety of 2,5-Dimethylthiophene The following contents are mentioned in the article:

Kinetic studies and the effect of the vulcanization process on the pyrolysis of natural rubber (NR), butadiene rubber (BR) and styrene-butadiene rubber (SBR) were investigated in this work. The DAEM showed a better fitting of the exptl. results than the model-based method. The activation energy distribution of the DAEM verified by the model-free method indicated that the main decomposition of rubbers followed a chain reaction mechanism. Pyrolysis of raw rubbers and their corresponding vulcanized rubbers were conducted in a fixed-bed reactor. The sulfur content and product yields were quantified. Pyrolysis oils were characterized and compared. The oil yields reached a maximum at 430°C for NR (90.82%), 470°C for both BR (90.61%) and SBR (92.80%). Pyrolytic oils of raw rubbers were mainly composed of their corresponding monomer or dimer, trimer compounds However, the results of vulcanized rubbers pyrolysis were significantly different. Sulfur in the vulcanized rubbers was released at low temperatures due to the lower bond energy. Higher temperatures led to the conversion of sulfur-containing oils to gaseous compounds Vulcanization promoted the decomposition of rubbers at low temperatures but had an insignificant influence on pyrolysis products distribution at high temperature Pyrolysis oils of vulcanized rubbers were more complex, constituting various aromatic hydrocarbons and thiophenes. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Safety of 2,5-Dimethylthiophene).

2,5-Dimethylthiophene (cas: 638-02-8) belongs to benzothiophene derivatives. Benzothiophene finds use in research as a starting material for the synthesis of larger, usually bioactive structures. Due to its aromaticity, thiophenes do not exhibit the same properties as conventional thioethers.Safety of 2,5-Dimethylthiophene

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Catalytic Synthesis of Methylthiophenes was written by Mashkina, A. V.;Khairulina, L. N.. And the article was included in Russian Journal of Organic Chemistry in 2018.Computed Properties of C6H8S The following contents are mentioned in the article:

The gas-phase reaction of di-Me disulfide with thiophene over Co/HZSM-5 catalyst in a helium medium under atm. pressure at 250-350° gave a mixture of mono-, di-, tri- and tetramethylthiophenes with an overall selectivity of 94-96%. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Computed Properties of 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, sertaconazole, and also BTCP.Computed Properties of C6H8S

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

TfOH-Catalyzed Reaction between 3-Diazoindolin-2-imines and Electron-Rich Arenes: Access to 3-Aryl-2-aminoindoles was written by Qi, Jie;Wang, Zaibin;Lang, Bo;Lu, Ping;Wang, Yanguang. And the article was included in Journal of Organic Chemistry in 2017.Product Details of 638-02-8 The following contents are mentioned in the article:

TfOH-catalyzed reactions between 3-diazoindolin-2-imines and electron-rich arenes were disclosed. These metal-free reactions furnished 3-aryl-2-aminoindoles in moderate to excellent yields with the tolerance of a broad range of functional groups. This study involved multiple reactions and reactants, such as 2,5-Dimethylthiophene (cas: 638-02-8Product Details 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. Its aromaticity makes it relatively stable, although as a heterocycle, it has reactive sites which allow for functionalization.Product Details of 638-02-8

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem