Category: 104-76-7

Gomez, M.; Murcia, M. D.; Serrano-Arnaldos, M.; Gomez, E.; Gomez, J. L.; Hidalgo, A. M.; Maximo, M. F. published the artcile< Developing the rate equations for two enzymatic Ping-Pong reactions in series: Application to the bio-synthesis of Bis(2-ethylhexyl) azelate>, COA of Formula: C8H18O, the main research area is Bis 2 ethylhexyl azelate lipase ping pong reaction.

In this work, the rate equations of two simultaneous bisubstrate Ping-Pong in series reactions have been developed for the first time. To obtain these equations, the approximation to the stationary state has been applied and, for the total balance of enzyme, all the intermediate complexes of the two reactions, which are present simultaneously in the reaction medium, have been taken into account. To check the kinetic equations obtained, the synthesis of bis(2-ethylhexyl) azelate by transesterification from di-Et azelate and 2-ethylhexanol, in the presence of the immobilized lipase Novozym 435, has been used as reaction model. The reaction has been carried out in solvent-free conditions in a batch reactor. A design model of the reactor has also been developed and solved by applying a numerical method. The model equations have been implemented in users software in Visual Basic for Applications. In that software a routine, based on a very well-known procedure to minimize the sum of the square errors, has also been implemented. By using this software, the model parameters have been determined by fitting the exptl. data to the model. A high determination coefficient was obtained, which validated both the kinetic equations and the reactors design model.

Biochemical Engineering Journal published new progress about 104-76-7. 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, COA of Formula: C8H18O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Paradiz Dominguez, Maximilian; Demirkurt, Beguem; Grzelka, Marion; Bonn, Daniel; Galmiche, Laurent; Audebert, Pierre; Brouwer, Albert M. published the artcile< Fluorescent Liquid Tetrazines>, Application In Synthesis of 104-76-7, the main research area is branched alkoxy tetrazine photophys property rheol viscosity; excited states; fluorescence; inter system crossing; rheology; viscosity.

Tetrazines with branched alkoxy substituents are liquids at ambient temperature that despite the high chromophore d. retain the bright orange fluorescence that is characteristic of this exceptional fluorophore. Here, we study the photophys. properties of a series of alkoxy-tetrazines in solution and as neat liquids We also correlate the size of the alkoxy substituents with the viscosity of the liquids We show using time-resolved spectroscopy that intersystem crossing is an important decay pathway competing with fluorescence, and that its rate is higher for 3,6-dialkoxy derivatives than for 3-chloro-6-alkoxytetrazines, explaining the higher fluorescence quantum yields for the latter. Quantum chem. calculations suggest that the difference in rate is due to the activation energy required to distort the tetrazine core such that the nπ*S1 and the higher-lying ππ*T2 states cross, at which point the spin-orbit coupling exceeding 10 cm-1 allows for efficient intersystem crossing to occur. Femtosecond time-resolved anisotropy studies in solution allow us to measure a pos. relationship between the alkoxy chain lengths and their rotational correlation times, and studies in the neat liquids show a fast decay of the anisotropy consistent with fast exciton migration in the neat liquid films.

Molecules published new progress about Anisotropy. 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, Application In Synthesis of 104-76-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Fan, Xiaojing; Jiao, Xin; Liu, Jinguang; Jia, Meng; Blanchard, Chris; Zhou, Zhongkai published the artcile< Characterizing the volatile compounds of different sorghum cultivars by both GC-MS and HS-GC-IMS>, Formula: C8H18O, the main research area is sorghum volatile compound GC MS IMS; GC-IMS; GC-MS; Odor-active value; Sorghum; Volatile compound.

The current study applied both GC-MS and GC-IMS for characterizing volatile compounds of six Australian sorghum cultivars. For raw sorghum, the result of GC-MS showed that ester compounds were abundant in six raw samples. Among these esters, the content of hexadecanoic acid Et ester was highest in all of the raw samples. Compound 3-octanone only existed in Apollo, Bazley and Liberty, and 2-undecanone was found to be in MR43. Result of GC-IMS showed that signals of benzaldehyde, 2,3-butanedione were generally noted in six raw samples. In general, The Apollo and Buster had more volatile compounds, followed by Bazley and Liberty. In contrast, MR43 and G44 had least volatile compounds For cooked sorghums, more fatty aldehydes are formed compared to its corresponding raw sample, in which current data indicated that 40 volatile compounds were identified by GC-MS, and 11 of them were identified as the key aroma compounds More important, variation in the compounds of hexanal, heptanal, octanal, 2-heptenal, nonanal, trans- 2-octenal, benzeneaceldehyde, (E)-2-nonenal, 1-octen-3-ol, 1-pentanol, 2-methoxy-4-vinylphenol and 2-pentylfuran might be applied for explaining the aroma characteristics among six sorghum cultivars. Result of GC-IMS showed that 26 volatile compounds but not in results from GC-MS detection, indicating advantage of methodol. combination for a better understanding impact of cultivars and cooking on volatile characteristics of sorghums.

Food Research International published new progress about Alcohols Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, Formula: C8H18O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wakayama, Takanari; Ito, Yuki; Sakai, Kiyoshi; Miyake, Mio; Shibata, Eiji; Ohno, Hiroyuki; Kamijima, Michihiro published the artcile< Comprehensive review of 2-ethyl-1-hexanol as an indoor air pollutant>, Application In Synthesis of 104-76-7, the main research area is review indoor air pollutant; 2-ethyl-1-hexanol; emission mechanism; indoor air pollution; indoor concentration; sick building syndrome; volatile organic compounds.

A review. Objectives : 2-Ethyl-1-hexanol (2EH), a fragrance ingredient and a raw material for the production of plasticizer di(2-ethylhexyl) phthalate, is responsible for sick building syndrome (SBS). This review aims to clarify the 2EH characteristics as an indoor air pollutant such as indoor air concentration, emission mechanism, toxicity, and clin. effects. Methods : Scientific publications in English that has been made available on PubMed as of June 2018 and ad hoc publications in regional languages were reviewed. Results : Inhalation exposure to 2EH caused mucous membrane irritation in the eyes, nose, and throat in exptl. animals. Studies in human volunteers revealed an increase in olfactory irritation and eye discomfort. There has been increasing evidence of 2EH being present in indoor air in buildings. The primary sources of 2EH emissions are not building materials themselves, but instead the hydrolysis of plasticizers and flooring adhesives. In particular, compounds like di(2-ethylhexyl) phthalate present in polyvinyl chloride flooring materials are hydrolyzed upon contact with alk. moisture-containing concrete floors. That being said, it may be observed that indoor concentrations of 2EH increased every year during summer. Conclusions : Unlike other volatile organic compounds that cause SBS, 2EH can be retained in indoor air for long durations, increasing the likelihood of causing undesirable health effects in building occupants exposed to it. As a precautionary measure, it is important to use flooring materials that do not emit 2EH by hydrolysis, or to dry concrete before covering with flooring materials.

Journal of Occupational Health published new progress about Air. 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, Application In Synthesis of 104-76-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Castagnoli, Emmanuelle; Backlund, Peter; Talvitie, Oskari; Tuomi, Tapani; Valtanen, Arja; Mikkola, Raimo; Hovi, Hanna; Leino, Katri; Kurnitski, Jarek; Salonen, Heidi published the artcile< Emissions of DEHP-free PVC flooring>, Electric Literature of 104-76-7, the main research area is PVC C9 alc volatile organic compound indoor air pollution; 2-ethylhexanol; C9-alcohol; PVC; TVOC; flooring; phthalates.

Degrading 2-ethylhexyl-containing PVC floorings (eg DEHP-PVC floorings) and adhesives emit 2-ethylhexanol (2-EH) in the indoor air. The danger of flooring degradation comes from exposing occupants to harmful phthalates plasticisers (eg DEHP), but not from 2-EH as such. Since the EU banned the use of phthalates in sensitive applications, the market is shifting to use DEHP-free and alternative types of plasticisers in PVC products. However, data on emissions from DEHP-free PVC floorings are scarce. This study aimed at assessing the surface and bulk emissions of two DEHP-free PVC floorings over three years. The floorings were glued on the screed layer of concrete casts at 75%, 85%, and 95% RH. The volatile organic compounds (VOCs) were actively sampled using FLEC (surface emissions) and micro-chamber/thermal extractor (μ-CTE, bulk emissions) onto Tenax TA adsorbents and analyzed with TD-GC-MS. 2-EH, C9-alcs., and total volatile organic compound (TVOC) emissions are reported. Emissions at 75% and 85% RH were similar. As expected, the highest emissions occurred at 95% RH. 2-EH emissions originated from the adhesive. Because the two DEHP-free floorings tested emitted C9-alcs. at all tested RH, it makes the detection of flooring degradation harder, particularly if the adhesive used does not emit 2-EH.

Indoor Air published new progress about Alcohols, C9 Role: POL (Pollutant), OCCU (Occurrence). 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, Electric Literature of 104-76-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Dewidar, Assem A.; Sorial, George A. published the artcile< Effect of surfactin on removal of semi-volatile organic compound: Emphasis on enhanced biofiltration performance>, Recommanded Product: 2-Ethylhexan-1-ol, the main research area is surfactin semi volatile organic compound biofiltration; Biosurfactant; Biotrickling filter; Fungi; Semi-volatile organic compound (SVOC); Surfactin.

The performance of a lab-scale biotrickling filter inoculated with a mixed fungal consortium was investigated for the simultaneous abatement of 2-ethylhexanol; a hydrophobic semi-volatile organic compound, and propylene glycol monomethyl ether. The biotrickling filter performance was investigated in the presence of lipopeptide-type biosurfactant, surfactin. The effect of surfactin on the removal efficiency and elimination capacity was examined at stretched inlet loading rates: 1.04 to 15.7 and 3.2-48 g m-3 h-1 of propylene glycol monomethyl ether and 2-ethylhexanol, resp. Seeding the biotrickling filter with 50 mg L-1 of surfactin maintained high and consistent removal efficiencies of propylene glycol monomethyl ether and 2-ethylhexanol up to loading rates of 15.7 and 32 g m-3 h-1, with removal efficiencies of 98.5 and 99%, resp. Once the loading rate of 2-ethylhexanol increased to 48 g m-3 h-1, a substrate inhibition was observed, accompanied by a sudden decrease in removal efficiency from 99.2 to 62.3%. At the same loading rates, the biotrickling filter performance was improved by reseeding 100 mg L-1 of surfactin, hence, reinstated the removal efficiency of 2-ethylhexanol to 92.7% and achieving a maximum elimination capacity of 44.5 g m-3 h-1. This enhanced semi-volatile organic compounduptake rate was further confirmed by a considerable increase in reaction rate constant from 0.005 to 0.017 s-1. A batch study was also conducted at the end of the exptl. run to better understand the correlation between surfactin concentrations and the time-dependent partition coefficient of 2-ethylhexanol. Biofilm microbial community structure revealed relative abundancy of 72 and 28% of Trichoderma asperellum and Fusarium solani, resp. The findings of this study show for the first time that the removal of a semi-volatile organic compd such as 2-ethylhexanol is feasible in the presence of surfactin and hence improving the bioavailability of hydrophobic semi-volatile organic compound

Environmental Research published new progress about Bioavailability. 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, Recommanded Product: 2-Ethylhexan-1-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Melchiorre, Massimo; Amendola, Raffaele; Benessere, Vincenzo; Cucciolito, Maria E.; Ruffo, Francesco; Esposito, Roberto published the artcile< Solvent-free transesterification of methyl levulinate and esterification of levulinic acid catalyzed by a homogeneous iron(III) dimer complex>, HPLC of Formula: 104-76-7, the main research area is transesterification methyl levulinate esterification levulinic acid iron complex catalyst.

Levulinic acid esters MeC(O)CH2CH2CO2R (LAE) are emerging bio-based chems. used as solvents, additives and plasticizers. In this work a variety of levulinates (R= Bu, n-hexyl, n-octyl, 2-ethylhexyl, geranyl, 2-ethoxyethyl, benzyl, 2-octyl, cyclohexyl, menthyl) is obtained from the solvent-free transesterification of Me levulinate (ML) and esterification of levulinic acid (LA), catalyzed by a dimeric complex of iron(III). The results are competitive with the few related reports of literature mainly based on heterogeneous catalysis. This first systematic study based on a homogeneous catalytic system therefore represents a significant extension within the field of biomass valorization.

Molecular Catalysis published new progress about Alcohols Role: RCT (Reactant), RACT (Reactant or Reagent). 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, HPLC of Formula: 104-76-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Han, Xiaoxu; An, Hualiang; Zhao, Xinqiang; Wang, Yanji published the artcile< Influence of acid-base properties on the catalytic performance of Ni/hydroxyapatite in n-butanol Guerbet condensation>, Category: alcohols-buliding-blocks, the main research area is acid base catalytic nickel hydroxyapatite butanol Guerbet condensation.

A series of supported Ni-based multifunctional catalysts were prepared and their catalytic performances for n-butanol Guerbet condensation reaction were evaluated. Ni/hydroxyapatite (HAP) shows the best catalytic performance: a selectivity of 2-ethylhexanol reaches 52.4% at an n-butanol conversion of 29.6% at 230°C. The activity evaluation results indicate that Ni/HAP with both high-d. of acid sites and high-d. of base sites have higher catalytic performance. Furthermore, the importance of acid-base synergistic catalysis was proved by evaluating the change of the catalytic performance of Ni/HAP catalyst after poisoning the acidic or basic sites using an acid or a base probe mol.

Catalysis Communications published new progress about Catalyst poisoning. 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Xiang, Xiao-le; Jin, Guo-feng; Gouda, Mostafa; Jin, Yong-guo; Ma, Mei-hu published the artcile< Characterization and classification of volatiles from different breeds of eggs by SPME-GC-MS and chemometrics>, Recommanded Product: 2-Ethylhexan-1-ol, the main research area is chicken egg alkane aldehyde alc ketone terpenoid amine chemometrics; Characterization; Classification; Discriminate; Multivariate analysis; SPME-GC–MS; Shell hatching egg; Volatiles.

Volatiles of shell eggs were identified by SPME-GC-MS to characterize and discriminate white Leghorn (W), Hy-line brown (H) and Jing fen (J) hatching eggs with comparison, principal components (PC), partial least squares (PLS), random forest classification (RFC) and canonical discriminant (CD) analyses. DVB/CAR/PDMS fiber and extraction 60 min were suited to analyze the volatiles emitted from eggs. A total of 17 or 18 volatile compounds were identified in raw shell hatching eggs, namely, nonanal, decanal and 6-methly-5-hepten-2-one were the main volatile components with contributions that over 70%. The composition and/or profile of volatile compounds from W and H eggs were much more similar than J eggs. Hexanal, decanal, 6-methly-5-hepten-2-one, heptanal, etc. have greatly contributed to the distinction of W, H and J eggs in sparse (S)-PLS and orthogonal (O)-PLS models. The accuracy of RFC and CD model were 100%, 100% (initial) and 83.3% (cross-validation), resp. Heptanal, 6-methly-5-hepten-2-one, octanal, etc. were contributed pos. to the classification of W, H, J eggs in RFC, especially for heptanal.

Food Research International published new progress about Chemometrics. 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, Recommanded Product: 2-Ethylhexan-1-ol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kuljiraseth, J.; Wangriya, A.; Malones, J. M. C.; Klysubun, W.; Jitkarnka, S. published the artcile< Synthesis and characterization of AMO LDH-derived mixed oxides with various Mg/Al ratios as acid-basic catalysts for esterification of benzoic acid with 2-ethylhexanol>, SDS of cas: 104-76-7, the main research area is aqueous miscible organic solvent layered double hydroxide esterification; acid base property.

Proven to possess distinguishable phys. and acid-base properties superior to conventional LDHs, aqueous miscible organic solvent-layered double hydroxides (AMO-LDHs) were thus synthesized and used as precursors to prepare the Mg/Al mixed oxide catalysts in this work. The AMO-LDH based oxide catalysts with various ratios of Mg/Al were studied for the chem. and phys. properties and the activity on esterification of benzoic acid with 2-ethylhexanol. The catalysts were characterized using BET, XRD, TGA, and XPS. Moreover, the acid-base properties were studied. As a result, the Mg/Al mixed oxides after calcination at 500 °C still had the clay structure, and were found to possess both acid and base sites. As the Mg/Al ratio increased, the total d. of acid and basic sites decreased. Moreover, the acid-basic strength depended on their phase compositions and coordination number The activity of calcined LDHs catalysts was tested for the esterification of benzoic acid with 2-ethylhexanol, aimed at producing 2-ethylhexyl benzoate as the desired chem. The products were analyzed using GC-MS/TOF. In summary, the conversion of benzoic acid was enhanced significantly using the Mg-Al mixed oxides as the catalysts, owing to the acid-base sites (both Mg2+-O2- and Al3+-O2- pairs) of the catalysts. The catalyst with the Mg/Al ratio of 4:1 can convert 66% benzoic acid to 2-ethylhexyl benzoate. Moreover, the other products were composed of 2-ethylhexanal, 3-heptanone, and 3-heptanol because of acid-base pairs.

Applied Catalysis, B: Environmental published new progress about Acidity. 104-76-7 belongs to class alcohols-buliding-blocks, and the molecular formula is C8H18O, SDS of cas: 104-76-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts