Month: October 2022

Zhang, Kan; Yao, Yanxiu; Sun, Wenjin; Wen, Rui; Wang, Yanyan; Sun, Huaming; Zhang, Weiqiang; Zhang, Guofang; Gao, Ziwei published an article in 2021. The article was titled 《Triazine-wingtips accelerated NHC-Pd catalysed carbonylative Sonogashira cross-coupling reaction》, and you may find the article in Chemical Communications (Cambridge, United Kingdom).Formula: C7H7IO The information in the text is summarized as follows:

By using a ppm-level precatalyst T-NHC-Pd, the highly efficient coupling of aryl iodide, alkyne and carbon monoxide furnished a variety of ynone compounds T-NHC-Pd, which deprotonated 4-methyl-phenylacetylene under mild conditions, converted into alkynyl-coordinated catalytic active species PdCl(T-NHC)(Py)(alkynyl). In the putative Pd/Pd catalytic cycle, both triazine-wingtips and NHCs were key players for establishing the carbonylative cross-couplings with high TON and TOF. After reading the article, we found that the author used 1-Iodo-2-methoxybenzene(cas: 529-28-2Formula: C7H7IO)

1-Iodo-2-methoxybenzene(cas: 529-28-2) participates in palladium catalyzed enantioselective Heck arylation of 2,3-dihydrofuran in the presence of chiral ionic liquids containing L-prolinate and L-lactate anions and non-chiral quaternary ammonium cations.Formula: C7H7IO

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Computed Properties of C7H9BO3In 2019 ,《Installation of Minimal Tetrazines through Silver-Mediated Liebeskind-Srogl Coupling with Arylboronic Acids》 was published in Journal of the American Chemical Society. The article was written by Lambert, William D.; Fang, Yinzhi; Mahapatra, Subham; Huang, Zhen; am Ende, Christopher W.; Fox, Joseph M.. The article contains the following contents:

Described is a general method for the installation of a minimal 6-methyltetrazin-3-yl group via the 1st example of a Ag-mediated Liebeskind-Srogl cross-coupling. The attachment of bioorthogonal tetrazines on complex mols. typically relies on linkers that can neg. impact the physiochem. properties of conjugates. Cross-coupling with arylboronic acids and a new reagent, 3-((p-biphenyl-4-ylmethyl)thio)-6-methyltetrazine (b-Tz), proceeds under mild, PdCl2(dppf)-catalyzed conditions to introduce minimal, linker-free tetrazine functionality. Safety considerations guided the authors’ design of b-Tz which can be prepared on decagram scale without handling hydrazine and without forming volatile, high-N tetrazine byproducts. Replacing conventional Cu(I) salts used in Liebeskind-Srogl cross-coupling with a Ag2O mediator resulted in higher yields across a broad library of aryl and heteroaryl boronic acids and provides improved access to a fluorogenic tetrazine-BODIPY conjugate. A covalent probe for MAGL incorporating 6-methyltetrazinyl functionality was synthesized in high yield and labeled endogenous MAGL in live cells. This new Ag-mediated cross-coupling method using b-Tz is anticipated to find addnl. applications for directly introducing the tetrazine subunit to complex substrates. The results came from multiple reactions, including the reaction of 3-Methoxyphenylboronic acid(cas: 10365-98-7Computed Properties of C7H9BO3)

3-Methoxyphenylboronic acid(cas: 10365-98-7) belongs to boronic acids. Boronic acids are mild Lewis acids which are generally stable and easy to handle, making them important to organic synthesis.Computed Properties of C7H9BO3

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Recommanded Product: 1-(Dimethylamino)-3-(2-(3-methoxyphenethyl)phenoxy)propan-2-ol hydrochlorideOn September 10, 2019 ,《Determination of epoxide impurity in sarpogrelate hydrochloride intermediate by UHPLC and column-switching liquid chromatography》 was published in Journal of Pharmaceutical and Biomedical Analysis. The article was written by Wang, Ran; Zhu, Zhiling; Qiu, Xiaodan; Bai, Liping; Guo, Weiwei; Zuo, Limin; Zhao, Ting; Shan, Guangzhi. The article contains the following contents:

The determination of genotoxic impurities, which is closely related to toxicol. concern and daily dose, plays a key role in drug quality control. Epoxide impurity is a kind of genotoxic impurity with an epoxy ring structure during the synthesis process of sarpogrelate hydrochloride. According to the sarpogrelate hydrochloride daily dose, epoxide impurity is limited to the under 5 ppm level. The liquid chromatog.-tandem mass spectrometric (LC/MS/MS) or the gas chromatog.-mass spectrometric (GC/MS) method is commonly used to characterize the epoxide impurity of sarpogrelate hydrochloride intermediates. However, these methods are not simple or economical enough to detect epoxide impurity. In this study, we resolved the problem by using the most common UV method with two ideas: one was to improve the absolute sensitivity, and the other was to reduce matrix effects. Both ultra high-performance liquid chromatog. (UHPLC with high sensitivity LightPipe flow cells) and column-switching liquid chromatog. methods were developed and validated for the quant. determination of epoxide impurity in sarpogrelate hydrochloride intermediates. The limits of detection (LODs) of the UHPLC and column-switching liquid chromatog. methods were 0.09 ppm (0.09μg/g) and 0.33 ppm (0.33μg/g), and the recovery rates of both methods were 87.2%-132.1% and 97.4%-100.1%, resp. Both methods established and provided guidance for analysts to develop procedures for impurity control, especially for structures of impurity with similar matrixes. In the experimental materials used by the author, we found 1-(Dimethylamino)-3-(2-(3-methoxyphenethyl)phenoxy)propan-2-ol hydrochloride(cas: 135261-74-4Recommanded Product: 1-(Dimethylamino)-3-(2-(3-methoxyphenethyl)phenoxy)propan-2-ol hydrochloride)

1-(Dimethylamino)-3-(2-(3-methoxyphenethyl)phenoxy)propan-2-ol hydrochloride(cas: 135261-74-4) belongs to anime. To avoid the problem of multiple alkylation, methods have been devised for “blocking” substitution so that only one alkyl group is introduced. The Gabriel synthesis is one such method; it utilizes phthalimide, C6H4(CO)2NH, whose one acidic hydrogen atom has been removed upon the addition of a base such as KOH to form a salt.Recommanded Product: 1-(Dimethylamino)-3-(2-(3-methoxyphenethyl)phenoxy)propan-2-ol hydrochloride

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

The author of 《Facile Process for Metallizing DNA in a Multitasking Deep Eutectic Solvent for Ecofriendly C-C Coupling Reaction and Nitrobenzene Reduction》 were Chakraborty, Supratim; Mruthunjayappa, Manohara Halanur; Aruchamy, Kanakaraj; Singh, Nripat; Prasad, Kamalesh; Kalpana, Dharmalingam; Ghosh, Debasis; Sanna Kotrappanavar, Nataraj; Mondal, Dibyendu. And the article was published in ACS Sustainable Chemistry & Engineering in 2019. Formula: C7H9BO3 The author mentioned the following in the article:

Metalized DNA is an exciting functional material having widespread utility toward multifunctional applications. However, conventional DNA metalization processes are time-consuming and multistep and, most importantly, the helicity of DNA is destroyed during the metalization process. Herein, an ecofriendly and rapid approach was demonstrated to metalize salmon milt DNA with Pd and Fe3O4 in deep eutectic solvent (DES; ChoCl-EG 1:2 mol ratio) without disturbing the structural integrity of the biopolymer. Besides maintaining the stability of DNA at high temperature, DES played the dual role of (i) a solvent for DNA metalization and (ii) a reducing agent for reduction of Pd(II) to Pd(0) during the metalization process. Microscopic studies confirmed the stepwise formation of aggregated coil type morphol. in metalized DNA (Pd-DNA-Fe3O4). Whereas, the interactions between Pd and Fe3O4 with DNA in Pd-DNA-Fe3O4 were probed by different anal. tools, which suggested that Pd interacted with phosphate groups and Fe3O4 interacted with the base pairs of DNA. CD spectroscopy anal. established that the B-form of DNA was maintained before and after the metalization process. After successful metalization, Pd-DNA-Fe3O4 was utilized as a nanobiocatalyst for Suzuki coupling reaction and reduction of nitrobenzene to aniline. The metalized DNA showed remarkable catalytic activity and efficiency for sustainable Suzuki coupling reaction in DES. Under optimized conditions, 100% conversion of the substrates was recorded with 100% selectivity of the desired C-C coupled product. Taking advantage of the high temperature stability of DNA in DES, the recyclability (up to 6 cycles) potential of both metalized DNA and DES toward C-C coupling was explored without significant loss in the catalytic activity, thus demonstrating the green aspects of the process. When utilized as a catalyst for the reduction of nitrobenzene to aniline, ∼90% conversion of nitrobenzene was achieved with 66% selectivity of aniline which suggested that the overall assembly of metalized DNA is a efficient system to carry out facile nitrobenzene reduction Overall, the present study demonstrates a general process for metalization of DNA in DES and the applications of the metalized DNA as a catalyst in different organic reactions. In the experiment, the researchers used 3-Methoxyphenylboronic acid(cas: 10365-98-7Formula: C7H9BO3)

3-Methoxyphenylboronic acid(cas: 10365-98-7) belongs to boronic acids. Boronic acids are mild Lewis acids which are generally stable and easy to handle, making them important to organic synthesis.Formula: C7H9BO3

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

The author of 《Chain-growth horner-wadsworth-emmons condensation polymerization initiated with an aliphatic aldehyde》 were Sato, Keichiro; Goto, Eisuke; Ochiai, Yuto; Higashihara, Tomoya. And the article was published in Journal of Photopolymer Science and Technology in 2019. Safety of 1,4,7,10,13-Pentaoxacyclopentadecane The author mentioned the following in the article:

The effective initiation for the chain-growth Horner-Wadsworth-Emmons (HWE) condensation polymerization was succeeded by utilizing an aliphatic aldehyde. Due to the higher electrophilicity of the aliphatic aldehyde compared with the aromatic one, the reactivity of the initiation might be accelerated, producing uniform intermediates to result in the formation of well-defined poly(3-(2-ethylhexyl)thienylene vinylene) (P3EHTV). Consequently, P3EHTV possessed the predictable mol. weight and lower molar-mass dispersity (ETHM = 1.16) value than that of P3EHTV obtained by employing aromatic aldehyde compounds as the initiators. In this polymerization system, neither transition metals nor halogens are utilized to realize low environmental-load synthesis of well-defined π-conjugated polymers. The results came from multiple reactions, including the reaction of 1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5Safety of 1,4,7,10,13-Pentaoxacyclopentadecane)

1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5) is a member of crown ether Ligands. Crown-ethers are macrocyclic polyethers capable of forming host-guest complexes, especially with inorganic and organic cations. Crown-ethers can incorporate protonated primary amine compounds by formation of ion-dipole bonds with the oxygen atoms of the chiral selector. Crown-ethers have been widely used for the separation of several pharmaceuticals both in aqueous and non-aqueous media. Safety of 1,4,7,10,13-Pentaoxacyclopentadecane

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

《Distinctive Viewpoint on the Rapid Dissolution Mechanism of α-Chitin in Aqueous Potassium Hydroxide-Urea Solution at Low Temperatures》 was published in Macromolecules (Washington, DC, United States) in 2020. These research results belong to Huang, Junchao; Zhong, Yi; Zhang, Lina; Cai, Jie. Recommanded Product: 33100-27-5 The article mentions the following:

To develop a green solvent for chitin dissolution, the most fundamental aspects of its mechanism must be elucidated. In this work, an aqueous KOH/urea solution was utilized for the rapid dissolution of α-chitin without performing freeze-thaw cycles. It was found that the mechanism of α-chitin dissolution involved not only the fast expansion of its crystalline regions and hierarchical structure but also direct and strong interactions between K+ ions and chitin carbonyl oxygens. The relatively high flexibility and deformability of the K+ hydration shells allowed fast exchange between water mols. and carbonyl oxygens, which induced the cleavage of strong inter- and intramol. hydrogen bonds, resulting in the rapid swelling and destruction of the chitin crystal and dissolution of α-chitin. Moreover, the addnl. urea mitigated the hydrophobicity of chitin chains, which prevented self-aggregation and increased the mobility of chitin chains. The described α-chitin dissolution mechanism can help achieve a better understanding of biomacromol. dissolution The experimental part of the paper was very detailed, including the reaction process of 1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5Recommanded Product: 33100-27-5)

1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5) is a member of crown ether Ligands. Crown-ethers are macrocyclic polyethers capable of forming host-guest complexes, especially with inorganic and organic cations. Crown-ethers can incorporate protonated primary amine compounds by formation of ion-dipole bonds with the oxygen atoms of the chiral selector. Crown-ethers have been widely used for the separation of several pharmaceuticals both in aqueous and non-aqueous media. Recommanded Product: 33100-27-5

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

《Online Liquid Chromatography-Raman Spectroscopy Using the Vertical Flow Method》 was written by Lo, Yu-Hao; Hiramatsu, Hirotsugu. Safety of m-Methoxyphenol And the article was included in Analytical Chemistry (Washington, DC, United States) in 2020. The article conveys some information:

Liquid chromatog. and Raman spectroscopy (LC-Raman system) were combined and developed with the aid of the vertical flow method that enhances the Raman signal intensity. The LC-Raman system enabled the online acquisition of the nonresonance Raman spectrum of LC eluates. The authors employed singular value decomposition (SVD) and subsequent reconstruction of the components for the anal. of 2-dimensional (temporal and spectral) data. The obtained components were consistent with the Raman spectra and elution patterns of the samples, indicating the appropriateness of the SVD-based procedure. The rise and fall times of the elution band of the temporal component were considered as the instrumental function. D2O mixed with H2O exhibited increased full width at half maximum of the elution band of up to 30% in comparison to the calculated value because of diffusion. Band broadening was less significant in the case in which an immiscible solute (pentane) was mixed with H2O. The limits of detection and quantitation were 1.2 ± 0.1, 2.1 ± 0.1, and 2.7 ± 0.1 mM and 4.1 ± 0.1, 6.9 ± 0.1, and 9.1 ± 0.2 mM for the ortho-, meta-, and para-isomers of methoxyphenol, resp. The nonresonance Raman experiment provides the mol. specificity to LC from the inherent properties of eluates. The experimental process involved the reaction of m-Methoxyphenol(cas: 150-19-6Safety of m-Methoxyphenol)

m-Methoxyphenol(cas: 150-19-6) may be used as an analytical standard for the determination of the analyte in wine, coffee beans, wood samples, and mainstream smoke by gas chromatography (GC) based techniques.Safety of m-Methoxyphenol

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Chinnabattigalla, Sreenivasulu; Choudhury, Aditya; Gedu, Satyanarayana published their research in Organic & Biomolecular Chemistry in 2021. The article was titled 《[Pd]-Catalyzed para-selective allylation of phenols: access to 4-[(E)-3-aryl/alkylprop-2-enyl]phenols》.Category: ethers-buliding-blocks The article contains the following contents:

Herein, a highly regioselective [Pd]-catalyzed para-allylation of phenols ROH (R = Ph, 2-methylphenyl, 1-naphthyl, etc.) using simple, inactivated allylic alcs. R1CH(OH)C(R2)=CH2 (R1 = n-pentyl, Ph, 3,4,5-trimethoxyphenyl, etc; R2 = H, Me) as allylating coupling partners was described. Notably, this strategy is successful in open-air and under mild reaction conditions. Besides, the efficacy of the present protocol was demonstrated by the direct synthesis of obtusastyrene and obtustyrene. After reading the article, we found that the author used m-Methoxyphenol(cas: 150-19-6Category: ethers-buliding-blocks)

m-Methoxyphenol(cas: 150-19-6) may be used in synthesis of:C(4) symmetric calix[4]resorcinarene, 2-nitroso-5-methoxyphenol, 6-methoxy-2(3H)-benzoxazoloneCategory: ethers-buliding-blocks

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

Zimmermann, Birte M.; Ngoc, Trung Tran; Tzaras, Dimitrios-Ioannis; Kaicharla, Trinadh; Teichert, Johannes F. published their research in Journal of the American Chemical Society in 2021. The article was titled 《A Bifunctional Copper Catalyst Enables Ester Reduction with H2: Expanding the Reactivity Space of Nucleophilic Copper Hydrides》.Quality Control of 1,4,7,10,13-Pentaoxacyclopentadecane The article contains the following contents:

Employing a bifunctional catalyst based on a copper(I)/NHC complex and a guanidine organocatalyst, catalytic ester reductions to alcs. with H2 as terminal reducing agent are facilitated. The approach taken here enables the simultaneous activation of esters through hydrogen bonding and formation of nucleophilic copper(I) hydrides from H2, resulting in a catalytic hydride transfer to esters. The reduction step is further facilitated by a proton shuttle mediated by the guanidinium subunit. This bifunctional approach to ester reductions for the first time shifts the reactivity of generally considered “”soft”” copper(I) hydrides to previously unreactive “”hard”” ester electrophiles and paves the way for a replacement of stoichiometric reducing agents by a catalyst and H2. In the experiment, the researchers used many compounds, for example, 1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5Quality Control of 1,4,7,10,13-Pentaoxacyclopentadecane)

1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5) is a member of crown ether Ligands. Crown-ethers are macrocyclic polyethers capable of forming host-guest complexes, especially with inorganic and organic cations. Crown-ethers can incorporate protonated primary amine compounds by formation of ion-dipole bonds with the oxygen atoms of the chiral selector. Crown-ethers have been widely used for the separation of several pharmaceuticals both in aqueous and non-aqueous media. Quality Control of 1,4,7,10,13-Pentaoxacyclopentadecane

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

SDS of cas: 33100-27-5In 2019 ,《Theoretical prediction of 6Li/7Li separation in solvent extraction system using Urey model》 was published in Chemical Engineering Journal (Amsterdam, Netherlands). The article was written by Cui, Li; Yang, Xia; Wang, Junfeng; He, Hongyan; Guo, Yanxia; Cheng, Fangqin; Zhang, Suojiang. The article contains the following contents:

Separation of lithium isotopes (6Li, 7Li) is a key technol. to the development and utilization of nuclear energy. In this work, we present an efficient method to theor. estimate the separation factors of 6Li/7Li in solvent extraction system based on Urey model. The approach was implemented by calculating the equilibrium separation factor of 6Li/7Li in the crown ether/Li aqueous solution [15-crown-5 (15C5), Benzo-15-crown-5 (B15C5), 12-crown-4 (12C4), Dicyclohexyl-18-Crown-6 (DH18C6)/LiX-H2O, X = Cl/I] exchange system utilizing the calculated harmonic vibrational frequencies obtained by D. Functional Theory (DFT). The results showed that Urey model can correctly predict the direction of the 6Li/7Li separation as observed in the experiments With this model, the underlying mechanisms driving the equilibrium isotope separation were elucidated further. The coordination structure of the Li complex played a dominant role in the separation of 6Li/7Li. For the solvent extraction system comprising crown ether phase and LiX aqueous solution, the crown ether with strong ability of excluding the hydrated water of Li gives a higher separation factor. The ways by which Li-O bonding of the Li-crown ether complex can be weakened, such as reducing the coordinated water mols., applying high polar solvents, performing separation from Li salt with a softer anion, are helpful to improve the separation factor of 6Li/7Li at a fixed temperature The lithium isotopic exchange is an exothermic reaction. Decreasing temperature favors the exchange reaction. This work is expected to provide guidance for the design of the exchanger and screening of the chem. exchange system for the separation of 6Li/7Li. In the experimental materials used by the author, we found 1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5SDS of cas: 33100-27-5)

1,4,7,10,13-Pentaoxacyclopentadecane(cas: 33100-27-5) is a member of crown ether Ligands. Crown-ethers are macrocyclic polyethers capable of forming host-guest complexes, especially with inorganic and organic cations. Crown-ethers can incorporate protonated primary amine compounds by formation of ion-dipole bonds with the oxygen atoms of the chiral selector. Crown-ethers have been widely used for the separation of several pharmaceuticals both in aqueous and non-aqueous media. SDS of cas: 33100-27-5

Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem