Day: November 28, 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