Month: October 2022

《Clinical risk assessment of biotin interference with a high-sensitivity cardiac troponin T assay》 was published in Clinical Chemistry and Laboratory Medicine in 2020. These research results belong to Mumma, Bryn; Diercks, Deborah; Twerenbold, Raphael; Valcour, Andre; Ziegler, Andre; Schuetzenmeister, Andre; Kasapic, Dusanka; Tran, Nam. Related Products of 58-85-5 The article mentions the following:

Objectives : Biotin >20.0 ng/mL (81.8 nmol/L) can reduce Elecsys Troponin T Gen 5 (TnT Gen 5; Roche Diagnostics) assay recovery, potentially leading to false-neg. results in patients with suspected acute myocardial infarction (AMI). We aimed to determine the prevalence of elevated biotin and AMI misclassification risk from biotin interference with the TnT Gen 5 assay. Methods : Biotin was measured using an Elecsys assay in two cohorts: (i) 797 0-h and 646 3-h samples from 850 US emergency department patients with suspected acute coronary syndrome (ACS); (ii) 2023 random samples from a US laboratory network, in which biotin distributions were extrapolated for higher values using pharmacokinetic modeling. Biotin >20.0 ng/mL (81.8 nmol/L) prevalence and biotin 99th percentile values were calculated AMI misclassification risk due to biotin interference with the TnT Gen 5 assay was modeled using different assay cutoffs and test timepoints. Results : ACS cohort: 1/797 (0.13%) 0-h and 1/646 (0.15%) 3-h samples had biotin >20.0 ng/mL (81.8 nmol/L); 99th percentile biotin was 2.62 ng/mL (10.7 nmol/L; 0-h) and 2.38 ng/mL (9.74 nmol/L; 3-h). Using conservative assumptions, the likelihood of false-neg. AMI prediction due to biotin interference was 0.026% (0-h result; 19 ng/L TnT Gen 5 assay cutoff). US laboratory cohort: 15/2023 (0.74%) samples had biotin >20.0 ng/mL (81.8 nmol/L); 99th percentile biotin was 16.6 ng/mL (68.0 nmol/L). Misclassification risk due to biotin interference (19 ng/L TnT Gen 5 assay cutoff) was 0.025% (0-h), 0.0064% (1-h), 0.00048% (3-h), and <0.00001% (6-h). Conclusions : Biotin interference has minimal impact on the TnT Gen 5 assay's clin. utility, and the likelihood of false-neg. AMI prediction is extremely low. In the experimental materials used by the author, we found 5-((3aS,4S,6aR)-2-Oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoic acid(cas: 58-85-5Related Products of 58-85-5)

5-((3aS,4S,6aR)-2-Oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoic acid(cas: 58-85-5) may be used to elute proteins from avidin/streptavidin resins. It has been used for culturing of oligodendrocytes.Related Products of 58-85-5 And it has been used for blocking endogenous biotin during immunohistology procedures.

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

《Two-Coordinate Copper(I)/NHC Complexes: Dual Emission Properties and Ultralong Room-Temperature Phosphorescence》 was published in Angewandte Chemie, International Edition in 2020. These research results belong to Li, Jiayi; Wang, Liding; Zhao, Zifeng; Li, Xiaoyue; Yu, Xiao; Huo, Peihao; Jin, Qionghua; Liu, Zhiwei; Bian, Zuqiang; Huang, Chunhui. Quality Control of 1,3-Dimesityl-1H-imidazol-3-ium chloride The article mentions the following:

As a kind of photoluminescent material, CuI complexes have many advantages such as adjustable emission, variable structures, and low cost, attracting attention in many fields. In this work, two novel two-coordinate CuI-N-heterocyclic carbene complexes were synthesized, and they exhibit unique dual emission properties, fluorescence and phosphorescence. The crystal structure, packing mode, and photophys. properties under different conditions were systematically studied, proving the emissive mechanism to be the locally excited state of the carbazole group. Based on this mechanism, ultralong room-temperature phosphorescence (RTP) with a lifetime of 140 ms is achieved by selective deuteration of the carbazole group. These results deepen the understanding of the luminescence mechanism and design strategy for two-coordinate CuI complexes, and prove their potential in applications as ultralong RTP materials. After reading the article, we found that the author used 1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8Quality Control of 1,3-Dimesityl-1H-imidazol-3-ium chloride)

1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8) is a ligand for arylation of aldehydes and for carbene catalyzed intermolecular arylation of C-H bonds. It is used as a phosphine-free ligand in various metal-catalyzed coupling reactions, often with advantageous results in difficult cases.Quality Control of 1,3-Dimesityl-1H-imidazol-3-ium chloride

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

《A quantitative empirical directing group scale for selectivity in iridium-catalysed hydrogen isotope exchange reactions》 was published in Catalysis Science & Technology in 2020. These research results belong to Timofeeva, Daria S.; Lindsay, David M.; Kerr, William J.; Nelson, David J.. Synthetic Route of C21H25ClN2 The article mentions the following:

A palette of commonly used directing groups, including various pharmaceutically relevant nitrogen-containing heterocycles, are quant. ranked based on the results of intermol. hydrogen isotope exchange competition reactions using two iridium complexes: [Ir(COD)(IMes)(PPh3)][BArF24] and [IrCl(COD)(IMes)]. The directing group power scales that have been constructed from these data reveal a wide range of reactivity covering four orders of magnitude. Intramol. competition experiments have demonstrated that the obtained reactivity scale provides accurate predictions of regioselectivity within mols. with multiple competing directing groups. This work contributes to our understanding and control of regioselectivity in metal-catalyzed C-H activation reactions. The experimental part of the paper was very detailed, including the reaction process of 1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8Synthetic Route of C21H25ClN2)

1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8) is a ligand for arylation of aldehydes and for carbene catalyzed intermolecular arylation of C-H bonds. It is used as a phosphine-free ligand in various metal-catalyzed coupling reactions, often with advantageous results in difficult cases.Synthetic Route of C21H25ClN2

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

《Equilibrium Solvation, Electron-Transfer Reactions, and Stokes-Shift Dynamics in Ionic Liquids》 was written by Ghorai, Pradip Kr.; Matyushov, Dmitry V.. Quality Control of 3-Butyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate And the article was included in Journal of Physical Chemistry B in 2020. The article conveys some information:

A microscopic theory of solvent response by room-temperature ionic liquids is formulated based on the dynamic longitudinal susceptibility of liquid’s charge d. The susceptibility function combines the structural information in terms of reciprocal-space structure factors with the memory function responsible for solvation dynamics. The charge-d. structure factors and corresponding intermediate scattering functions are analyzed here by mol. dynamics simulations. They show the existence of two drastically different time scales of charge-d. fluctuations. Faster, stretched-exponential dynamics are consistent with dielec. measurements. It contributes to the Stokes-shift dynamics of coumarin-153 optical dye calculated with the new theory and compared to exptl. reports. The second, much slower and exponential, relaxation shows the phenomenol. of de Gennes narrowing: the relaxation time passes through a strong maximum at the wave vector representing the first peak of the structure factor. This peak, which is particularly sharp for the charge d., contributes significantly to the equilibrium free energy of solvation, thus invalidating dielec. theories of solvation for ionic liquids Dynamics of charge d. fluctuations at the length scale consistent with the sharp peak require long observation times. Electron-transfer reactions occurring on faster time-scales are not affected by these slow dynamics. Nonergodic reorganization energy of electron transfer, accounting for the observation window established by the reaction time, drops sharply when the reaction rate crosses the main peak in the Stokes-shift loss spectrum. The dependence of the reorganization energy on the reaction rate strongly affects the energy-gap law of electron transfer, with a tendency for a shallow or entirely disappearing inverted region. The experimental part of the paper was very detailed, including the reaction process of 3-Butyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate(cas: 174501-65-6Quality Control of 3-Butyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate)

3-Butyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate(cas: 174501-65-6) is a member of lonic liquids. A multidisciplinary study on lonic liquids is emerging, including chemistry, materials science, chemical engineering, and environmental science. More specifically, some important fundamental viewpoints are now different from the original concepts, as insights into the nature of lonic liquids become deeper. For example, the physicochemical properties of lonic liquids are now recognized as ranging broadly from the oft quoted “nonvolatile, non-flammable, and air and water stable” to those that are distinctly volatile, flammable, and unstable. Quality Control of 3-Butyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

《Enantioselective Twofold C-H Annulation of Formamides and Alkynes without Built-in Chelating Groups》 was written by Chen, Hao; Wang, Yin-Xia; Luan, Yu-Xin; Ye, Mengchun. SDS of cas: 141556-45-8 And the article was included in Angewandte Chemie, International Edition in 2020. The article conveys some information:

Twofold C-H annulation of readily available formamides and alkynes without built-in chelating groups was achieved. Ni-Al bimetallic catalysis enabled by a bulky BINOL-derived chiral secondary phosphine oxide (SPO) ligand proved to be critical for high reactivity and high selectivity. This reaction uses readily available formamides as starting materials and provides a concise synthetic pathway to a broad range of chiral ferrocenes in 40-98% yield and 93-99% ee. After reading the article, we found that the author used 1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8SDS of cas: 141556-45-8)

1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8) is a ligand for arylation of aldehydes and for carbene catalyzed intermolecular arylation of C-H bonds. It is used as a phosphine-free ligand in various metal-catalyzed coupling reactions, often with advantageous results in difficult cases.SDS of cas: 141556-45-8

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

《Combined Photoredox and Carbene Catalysis for the Synthesis of Ketones from Carboxylic Acids》 was written by Bay, Anna V.; Fitzpatrick, Keegan P.; Betori, Rick C.; Scheidt, Karl A.. Application of 530-62-1 And the article was included in Angewandte Chemie, International Edition in 2020. The article conveys some information:

As a key element in the construction of complex organic scaffolds, the formation of C-C bonds remains a challenge in the field of synthetic organic chem. Recent advancements in single-electron chem. have enabled new methods for the formation of various C-C bonds. Disclosed herein is the development of a novel single-electron reduction of acyl azoliums for the formation of ketones from carboxylic acids. Facile construction of the acyl azolium in situ followed by a radical-radical coupling was made possible merging N-heterocyclic carbene (NHC) and photoredox catalysis. The utility of this protocol in synthesis was showcased in the late-stage functionalization of a variety of pharmaceutical compounds Preliminary studies using chiral NHCs demonstrate that enantioselectivity can be achieved, showcasing the advantages of this protocol over alternative methodologies. The experimental process involved the reaction of Di(1H-imidazol-1-yl)methanone(cas: 530-62-1Application of 530-62-1)

Di(1H-imidazol-1-yl)methanone(cas: 530-62-1) is a coupling agent in the synthesis of dipolar polyamides for nonlinear optical applications and polypeptides. It also used to make β-keto sulfones and sulfoxides, lead sequestering agents, and β-enamino acid derivatives.Application of 530-62-1

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Bay, Anna V.; Fitzpatrick, Keegan P.; Gonzalez-Montiel, Gisela A.; Farah, Abdikani Omar; Cheong, Paul Ha-Yeon; Scheidt, Karl A. published their research in Angewandte Chemie, International Edition in 2021. The article was titled 《Light-Driven Carbene Catalysis for the Synthesis of Aliphatic and α-Amino Ketones》.HPLC of Formula: 530-62-1 The article contains the following contents:

Single-electron N-heterocyclic carbene (NHC) catalysis has gained attention recently for the synthesis of C-C bonds. Guided by d. functional theory and mechanistic analyses, authors report the light-driven synthesis of aliphatic and α-amino ketones using single-electron NHC operators. Computational and exptl. results reveal that the reactivity of the key radical intermediate is substrate-dependent and can be modulated through steric and electronic parameters of the NHC. Catalyst potential is harnessed in the visible-light driven generation of an acyl azolium radical species that underwent selective coupling with various radical partners to afford diverse ketone products. This methodol. is showcased in the direct late-stage functionalization of amino acids and pharmaceutical compounds, highlighting the utility of single-electron NHC operators. In the experiment, the researchers used many compounds, for example, Di(1H-imidazol-1-yl)methanone(cas: 530-62-1HPLC of Formula: 530-62-1)

Di(1H-imidazol-1-yl)methanone(cas: 530-62-1) is a peptide coupling reagent,it is used in the synthesis of peptides. Reacts readily with carboxylic acids to form acyl imidazoles; subsequent reaction with amines to form amides goes smoothly.HPLC of Formula: 530-62-1

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Mandal, Tanmoy; Yadav, Sudha; Choudhury, Joyanta published their research in Journal of Organometallic Chemistry in 2021. The article was titled 《Steric effect of NHC ligands in Pd(II)-NHC-catalyzed non-directed C-H acetoxylation of simple arenes》.Application In Synthesis of 1,3-Dimesityl-1H-imidazol-3-ium chloride The article contains the following contents:

Herein, a series of well-defined discrete [Pd(NHCRR1)(py)I2] complexes I [R = Me, Cy, n-Bu, Mes; R1 = Me, Cy, n-Bu, Mes, t-Bu, Ph; RR1 = Me, Cy, n-Bu, Mes] with systematically varied degree of spatial congestion at the Pd center, exerted through the R and R1 substituents on the NHC ligand, were explored in controlling the activity as well as the site-selectivity of non-directed acetoxylation of representative monosubstituted and disubstituted simple arenes (such as toluene, iodobenzene and bromobenzene, naphthalene and 1,2-dichlorobenzene). The resulting best yields were found to be 75% for toluene and 65% for bromobenzene with [Pd(NHCPhMe)(py)I2], 75% for iodobenzene and 79% for naphthalene with [Pd(NHCMeMe)(py)I2], and 41% for 1,2-dichlorobenzene with [Pd(NHCCyCy)(py)I2]. Most importantly, with increasing the bulkiness of the NHC ligand in the complexes, the selectivity of the distal C-acetoxylated products in comparison to the proximal ones, was enhanced to a great extent in all cases. Considering the vast library of NHC ligands, this study underscores the future opportunity to develop more strategies to improve the activity and the crucial site-selectivity of C-H functionalization reactions in simple as well as complex organic mols. The experimental part of the paper was very detailed, including the reaction process of 1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8Application In Synthesis of 1,3-Dimesityl-1H-imidazol-3-ium chloride)

1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8) is a ligand for arylation of aldehydes and for carbene catalyzed intermolecular arylation of C-H bonds. It is used as a phosphine-free ligand in various metal-catalyzed coupling reactions, often with advantageous results in difficult cases.Application In Synthesis of 1,3-Dimesityl-1H-imidazol-3-ium chloride

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Zhang, Zhi-Mao; Xu, Yu-Ting; Shao, Li-Xiong published an article in 2021. The article was titled 《Synthesis of N-heterocyclic carbene-Pd(II)-5-phenyloxazole complexes and initial studies of their catalytic activity toward the Buchwald-Hartwig amination of aryl chlorides》, and you may find the article in Journal of Organometallic Chemistry.Category: imidazoles-derivatives The information in the text is summarized as follows:

Three new N-heterocyclic carbene (NHC)-Pd(II) complexes using 5-phenyloxazole as the ancillary ligand was obtained in moderate to good yields by a one-pot reaction of the corresponding imidazolium salts, palladium chloride and 5-phenyloxazole under mild conditions. Initial studies showed that one of the complexes was an efficient catalyst for the Buchwald-Hartwig amination of aryl chlorides with various secondary and primary amines under the varied catalyst loading of 0.01-0.05 mol%, thus it will enriched the chem. of NHCs and gave an alternative catalyst for the coupling of challenging while cost-low aryl chlorides. The experimental part of the paper was very detailed, including the reaction process of 1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8Category: imidazoles-derivatives)

1,3-Dimesityl-1H-imidazol-3-ium chloride(cas: 141556-45-8) is a ligand for arylation of aldehydes and for carbene catalyzed intermolecular arylation of C-H bonds. It is used as a phosphine-free ligand in various metal-catalyzed coupling reactions, often with advantageous results in difficult cases.Category: imidazoles-derivatives

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Related Products of 174501-65-6In 2019 ,《Understanding the Properties of Ionic Liquids: Electrostatics, Structure Factors, and Their Sum Rules》 appeared in Journal of Physical Chemistry B. The author of the article were McDaniel, Jesse G.; Yethiraj, Arun. The article conveys some information:

The properties of room-temperature ionic liquids (ILs) may be viewed as resulting from a balance of electrostatic interactions that can be tuned at short range but constrained to satisfy universal, asymptotic screening conditions. Short-range interactions and ion packing provide ample opportunity for chem. tunability, while asymptotic sum rules dictate that the long-range structure and charge oscillation be similar to those of molten alkali halide salts. In this work, we study the structure factors and long-range electrostatic interactions in six ILs. The cation in all cases is 1-butyl-3-methylimidazolium (BMIM+), and we study six anions, namely, tetrafluoroborate (BF4-), hexafluorophosphate (PF6-), nitrate (NO3-), triflate (CF3SO3-), bisfluorosulfonylimide [(FSO2)2N-], and bistriflimide [(CF3SO2)2N-]. To gain insight, we perform similar computer simulations of a primitive molten salt model with and without electronic polarization. We emphasize universal similarities among ionic liquids and molten salts in the long-range ion ordering and the influence of electronic polarization on the screening conditions while also characterizing important differences in the short-range electrostatic interactions. We show that polarization systematically reduces charge oscillations by as much as ∼0.5-1 ion per radial shell, which we argue is general to all room-temperature ILs as well as molten salts. We suggest that a fundamentally important distinction among BMIM-based ionic liquids (with different anions) is the nature of the midrange, ∼1 Å-1 peak in the charge-correlation structure factor; while this correlation is straightforward to analyze in computer simulations, it may often be hidden in x-ray and/or neutron scattering structure factors. The experimental process involved the reaction of 3-Butyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate(cas: 174501-65-6Related Products of 174501-65-6)

3-Butyl-1-methyl-1H-imidazol-3-ium tetrafluoroborate(cas: 174501-65-6) is a member of lonic liquids. Actually, lonic liquids as innovative fluids have received wide attention only during the past two decades. The number of SCI papers published on lonic liquids has exponentially increased from a few in 1996 to >5000 in 2016, exceeding the annual growth rates of other popular scientific areas. Related Products of 174501-65-6

Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem