Month: October 2022

Fernandes, Alessandra A. G.; Leonarczyk, Ives A.; Ferreira, Marco A. B.; Dias, Luiz Carlos published the artcile< Diastereoselectivity in the boron aldol reaction of α-alkoxy and α,β-bis-alkoxy methyl ketones>, Recommanded Product: (S)-Methyl 2-hydroxy-3-methylbutanoate, the main research area is diastereoselective boron aldol alkoxy Me ketone synthesis DFT.

In this work, using DFT calculations, we investigated the 1,4 and 1,5 asym. induction in boron enolate aldol reactions of α-alkoxy and α,β-bisalkoxy Me ketones. We evaluated the steric influence of alkyl substituents at the α position and the stereoelectronic influence of the oxygen protecting groups at the α and β positions. Theor. calculations revealed the origins of the 1,4 asym. induction in terms of the nature of the β-substituent. The synergistic effect between the α,β-syn and α,β-anti-bisalkoxy stereocenters was elucidated. In the presence of the β-alkoxy center, the reaction proceeds through the Goodman-Paton 1,5-stereoinduction model, experiencing a minor influence of the α-alkoxy center.

Organic & Biomolecular Chemistry published new progress about Aldol addition, stereoselective. 24347-63-5 belongs to class esters-buliding-blocks, and the molecular formula is C6H12O3, Recommanded Product: (S)-Methyl 2-hydroxy-3-methylbutanoate.

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

Haecker, Joachim; Nguyen, Duc Hien; Rommel, Tobias; Zhao-Karger, Zhirong; Wagner, Norbert; Friedrich, K. Andreas published the artcile< Operando UV/vis Spectroscopy Providing Insights into the Sulfur and Polysulfide Dissolution in Magnesium-Sulfur Batteries>, COA of Formula: C19H34O2, the main research area is magnesium sulfur battery polysulfide dissolution.

The magnesium-sulfur battery represents a promising post-lithium system with potentially high energy d. and improved safety. However, just as all metal-sulfur systems, it is plagued with the polysulfide shuttle leading to active material loss and surface layer formation on the anode. To gain further insights, the present study aims to shed light on the dissolution characteristics of sulfur and polysulfides in glyme-based electrolytes for magnesium-sulfur batteries. Therefore, operando UV/vis spectroscopy and imaging were applied to survey their concentration in solution and the separator coloration during galvanostatic cycling. The influence of conductive cathode additives (carbon black and titanium nitride) on the sulfur retention and cycling overpotentials were investigated. Thus, valuable insights into the system′s reversibility and the benefit of addnl. reaction sites are gained. On the basis of these findings, a reduction pathway is proposed with S8, S62-, and S42- being the present species in the electrolyte, while the dissolution of S82- and S3•- is unfavored. In addition, the evolution of the sulfur species concentration during an extended rest at open-circuit voltage was investigated, which revealed a three-staged self-discharge.

ACS Energy Letters published new progress about Carbon black Role: TEM (Technical or Engineered Material Use), USES (Uses). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

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

Moon, Hye Hyeon; Park, Ji Eun; Kim, Young-Hoon; Kim, Jeong Hoon; Kim, Ho Sung published the artcile< Contrast enhancing pattern on pre-treatment MRI predicts response to anti-angiogenic treatment in recurrent glioblastoma: comparison of bevacizumab and temozolomide treatment>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is human recurrent glioblastoma bevacizumab temozolomide; Bevacizumab; Contrast enhancement; Glioblastoma; Imaging biomarker; MRI.

To evaluate the value of the contrast enhancing pattern on pre-treatment MRI for predicting the response to anti-angiogenic treatment in patients with IDH-wild type recurrent glioblastoma. This retrospective study enrolled 65 patients with IDH wild-type recurrent glioblastoma who received standard therapy and then received either bevacizumab (46 patients) or temozolomide (19 patients) as a secondary treatment. The contrast enhancing pattern on pre-treatment MRI was visually analyzed and dichotomized into contrast enhancing lesion (CEL) dominant and non-enhancing lesion (NEL) dominant types. Quant. volumetric anal. was used to support the dichotomization. The Kaplan-Meier method and Cox proportional hazards regression anal. were used to stratify progression free survival (PFS) according to the treatment in the entire patients, CEL dominant group, and NEL dominant group. In all patients, the PFS of those treated with bevacizumab was not significantly different from those treated with temozolomide (log-rank test, P = 0.96). When the contrast enhancing pattern was considered, bevacizumab was associated with longer PFS in the CEL dominant group (P = 0.031), whereas temozolomide showed longer PFS in the NEL dominant group (P = 0.022). Quant. anal. revealed mean values for the proportion of solid-enhancing tumor of 13.7% for the CEL dominant group and 4.3% for the NEL dominant group. Patients with the CEL dominant type showed a better treatment response to bevacizumab, whereas NEL dominant types showed a better response to temozolomide. The contrast enhancing pattern on pre-treatment MRI can be used to stratify patients with IDH wild-type recurrent glioblastoma according to the effect of anti-angiogenic treatment.

Journal of Neuro-Oncology published new progress about Antiangiogenic agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Palomba, Martina; Pompei, Sara; Roscini, Luca; Bagnoli, Luana published the artcile< Synthesis and biological evaluation of new indole and pyrrole carboxamides based on amino acids>, Formula: C19H34O2, the main research area is indolecarboxamide preparation antifungal; pyrrolecarboxamide preparation antifungal.

A series of indole-carboxamides I [R = H, 5-MeO, 5-F, 7-NO2, 5,6-di-MeO; R1 = i-Pr, CH(Me)Et, Bn, etc.; R2 = Me, Et] and II was synthesized through coupling reactions. Several substitutions on the aromatic ring and on the amino acids were well tolerated, and corresponding indole-carboxamides I and II were obtained with good yields. The same procedure could be also extended to pyrrole-carboxamides III. The compounds I [R = 5-MeO, 5,6-di-MeO, 7-NO2; R1 = i-Pr; R2 = Et] and III [R1 = i-Pr, R2 = Et] were screened for their antimicrobial activity against ten different yeast strains and only compounds I [R = 7-NO2, R1 = i-Pr, R2 = Et] and III [R1 = i-Pr, R2 = Et] showed an antifungal activity. Further explorations were required to clarify a potential applicability in biol. fields.

ARKIVOC (Gainesville, FL, United States) published new progress about Amides Role: PAC (Pharmacological Activity), SPN (Synthetic Preparation), THU (Therapeutic Use), BIOL (Biological Study), PREP (Preparation), USES (Uses). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

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

Kaplan, Fred; Schulz, Carl Ormund published the artcile< Long-range phosphorus-hydrogen spin-spin coupling in aromatic systems>, Quality Control of 112-63-0, the main research area is PHOSPHORUS H SPIN SPIN COUPLING; HYDROGEN P SPIN SPIN COUPLING; SPIN SPIN COUPLING H P; THIONOPHOSPHATES NMR; PHOSPHATE THIONO NMR.

The 60 Mc./sec. proton magnetic resonance spectra for the following series of thionophosphates were recorded: R1OP(S)OMe(NHEt) (I), R2OP(S)OMe(NHMe) (II), R2OP(S)OMe(NHCHMe2) (III), R2OP(S)OMe(NHCMe3) (IV), and R2OP(S)NHMe(NHMe) (V) (where R1 = 2,3,4,6-tetrachlorophenyl and R2 = 2,4,5-trichlorophenyl). P coupling through 4 bonds to the ortho-proton (1.41-1.66 cycles/sec.) and through 5 bonds to the meta-proton (0.88-1.16 cycles/sec.) is exhibited in compounds II-V. Assignment of the smaller of the 2 coupling constants to the interaction between the P and the meta-proton is justified by the results obtained for I which contains only a meta-proton. Substitution of N for O on the thionophosphate group has little effect on the magnitude of coupling constants However, introduction of 2 Cl substituents significantly increases both the ortho and meta H-P interactions. Similar effects were observed when the electropos. nature of the P atom was increased. When P is attached to the aromatic ring by a methylene group rather than an O there is no significant coupling between the P and the meta-proton. This indicates that the coupling, which is dependent on π-electron interactions between the P and the aromatic ring, is facilitated by the presence of O. A change in solvent from CCl4 to acetone causes a greater downfield shift of the meta-proton as compared with the ortho-proton, suggesting that the solvent has a rather intimate effect on the distribution of electrons of the π-system.

Chemical Communications (London) published new progress about NMR (nuclear magnetic resonance). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Quality Control of 112-63-0.

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

Wolday, Dawit; Legesse, Dorsisa; Kebede, Yazezew; Siraj, Dawd S.; McBride, Joseph A.; Striker, Robert published the artcile< Immune recovery in HIV-1 infected patients with sustained viral suppression under long-term antiretroviral therapy in Ethiopia>, Product Details of C19H34O2, the main research area is HIV1 viral suppression antiretroviral immune recovery.

Background: There is very little data on long-term immune recovery responses in patients on suppressive antiretroviral therapy (ART) in the setting of sub-Saharan Africa (SSA). Thus, we sought to determine CD4+ T-cell, CD8+ T-cell and CD4/CD8 ratio responses in a cohort of HIV infected individuals on sustained suppressive ART followed up for more than a decade. Methods: The cohort comprised adult patients who started ART between 2001 and 2007 and followed for up to 14 years. Trends in median CD4+ T-cells, CD8+ T-cells and CD4/CD8 ratio were reviewed retrospectively. Poisson regression models were used to identify factors associated with achieving normalized T-cell biomarkers. Kaplan-Meier curves were used to estimate the probability of attaining normalized counts while on suppressive ART. Results: A total of 227 patients with a median duration of follow-up on ART of 12 (IQR: 10.5-13.0) years were included. CD4 cell count increased from baseline median of 138 cells (IQR: 70-202) to 555 cells (IQR: 417-830). CD4 cell increased continuously up until 5 years, after which it plateaued up until 14 years of follow up. Only 69.6% normalized their CD4 cell count within a median of 6.5 (IQR: 3.0-10.5) years.

PLoS One published new progress about Aging, animal. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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

Zhang, Xuxu; Lin, Zitong; Ren, Xiaoyu; Qin, Chuanli; Meng, Qiuyu; Jiang, Xiankai published the artcile< High-performance supercapacitors enabled by boron/nitrogen co-doped carbons through WPU/PF/GO composite>, Quality Control of 112-63-0, the main research area is waterborne polyurethane phenolic resin graphene oxide supercapacitor electrochem performance.

In this study, a facile one-step carbonization was developed for producing B and N co-doped carbon through waterborne polyurethane, phenolic resin, and graphene oxide composite (nWPGC) used as electrode materials in supercapacitors. Furthermore, nitrogen-enriched carbon also had repetitive urethane bond (-NHCOO) in waterborne polyurethane (nWPU). Moreover, we used the ferric chloride treatment and washing method to remove the B-N bonds. The fabricated B/N co-doped carbon had a high specific capacitance of 356.3 F g-1 at 0.5 A g-1 in 6 M KOH electrolyte, with the surface area, and pore volume (611 m2 g-1 and 0.3 cm3 g-1). The assembled nWPGC-Fe-B//nWPGC-Fe-B sym. supercapacitor exhibited an energy d. of 10.35 Wh kg-1 was achieved at a power d. of 493.2 W kg-1. On top of that, the capacitor also maintained a well rate capability and brilliant cyclic stability of 89.78% capacitance retention even after 5000 cycles.

Ionics published new progress about Carbonization. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Quality Control of 112-63-0.

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

Han, Kai; Lin, Qizhao; Liu, Minghou; Meng, Kesheng; Ni, Zhanshi; Liu, Yu; Tian, Junjian; Qiu, Zhicong published the artcile< Experimental study on the micro-explosion characteristics of biodiesel/1-pentanol and biodiesel/ methanol blended droplets>, COA of Formula: C19H34O2, the main research area is biodiesel 1 pentanol methanol droplet microexplosion.

Alcs. and biodiesel are promising alternative biofuels for their excellent physicochem. properties and renewable property. Compared with low-carbon alcs., high-carbon 1-Pentanol has better fuel characteristics. The objective of the present study was to reveal the effects of different 1-pentanol addition ratios on the micro-explosion characteristics of blended droplets. Single droplet suspension experiment under atm. pressure and 700°C was carried out, and results were compared with that of methanol. The droplet had three initial diameters (1.281, 1.451, and 1.537 mm). The droplet evaporation images were recorded at 500 fps with a resolution of 1024 x 1024 pixels by a high-speed video camera, and the corresponding droplet diameter in the evaporation process was obtained by a MATLAB program. A new dimensionless micro-explosion intensity was proposed. The results showed that when the 1-pentanol volume content was 50% (B50P50), the micro-explosion number and total micro-explosion intensity reached the maximum With the increase of initial droplet diameter, the micro-explosion number, total micro-explosion intensity and droplet lifetime increased. Compared with biodiesel/1-pentanol blended droplets, biodiesel/methanol ones had better micro-explosion characteristics and shorter droplet lifetime. White fog formed in the evaporation process of blended droplets and pure biodiesel ones. In short, the addition of methanol and 1-pentanol caused micro-explosions, changed the evaporation behavior of biodiesel, and reduced droplet lifetime, which could be considered as an alternative fuel blended with biodiesel.

Renewable Energy published new progress about Biodiesel fuel. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, COA of Formula: C19H34O2.

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

Bunce, Richard A.; Herron, Derrick M.; Ackerman, Matthew L. published the artcile< Aryl-fused nitrogen heterocycles by a tandem reduction-Michael addition reaction>, Name: Methyl 2-(2-nitrophenyl)acetate, the main research area is nitrogen heterocycle aryl fused preparation; quinolineacetate tetrahydro preparation; benzoxazineacetate dihydro preparation; quinoxalineacetate tetrahydro preparation; nitrophenylpentenoate preparation tandem reduction Michael addition; nitrophenoxybutenoate preparation tandem reduction Michael addition; nitroanilinobutenoate preparation tandem reduction Michael addition.

The tetrahydroquinolines, benzoxazines, and quinoxalines I (X = CH2, O, NH; R = H, Me) were prepared from the nitrobenzenes II by tandem iron/HOAc reduction-Michael addition reactions.

Journal of Organic Chemistry published new progress about Heterocyclic compounds, nitrogen Role: SPN (Synthetic Preparation), PREP (Preparation). 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Name: Methyl 2-(2-nitrophenyl)acetate.

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

Whang, T.-J.; Wang, Y.-T.; Wu, Y.-P.; Wang, Y.-S.; Tsai, M.-C.; Huang, D.-S. published the artcile< Assessment of baseline toxicity of mono-cyclic aromatic compounds by Pseudomonas initial oxygen uptake assay>, Computed Properties of 112-63-0, the main research area is QSAR mono cyclic aromatic compound toxicity hydrophobicity electrophilicity.

The objective of this study was to develop quant. structure-activity relationships (QSARs) for the toxicity of mono-cyclic aromatic compounds in the Pseudomonas putida initial oxygen uptake assay. The QSARs were developed using response-surface based on descriptors for chem. hydrophobicity (log P) and electrophilicity (LUMO). The model (± 0.011)log P-0.389(± 0.013)LUMO-2.131(± 0.031);,R2 = 0.941,R2adj = 0.940, s= 0.119,F= 1206 led the authors to conclude that the polar and non-polar narcotics were statistically indistinguishable. Pentafluorophenol, pentachlorophenol and most dinitrophenols classified as weak acid respiratory uncouplers in literature fit well into this model when they were treated as their corresponding phenoxides. This latter result suggests that the action mechanism of these phenols should be reevaluated.

SAR and QSAR in Environmental Research published new progress about Aromatic compounds Role: ADV (Adverse Effect, Including Toxicity), BIOL (Biological Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Computed Properties of 112-63-0.

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