Month: October 2022

In 2017,Yao, Qiyi; Kong, Lingkai; Zhang, Fangfang; Tao, Xianghua; Li, Yanzhong published 《Base-Promoted Tandem Reaction towards Conjugated Dienone or Chromone Derivatives with a Cyano Group: Insertion of Alkynes into C-C σ-Bonds of 3-Oxopropanenitriles》.Advanced Synthesis & Catalysis published the findings.Application of 128071-75-0 The information in the text is summarized as follows:

Base-promoted insertion reactions of alkynes into the C-C σ-bonds of α-cyano ketones were established to construct highly functionalized conjugated olefins I [R1 = cyclohexyl, Ph, 4-BrC6H4, 3,4,5-(MeO)3C6H2, etc.; R2 = Ph, 4-ClC6h4, 4-MeC6H4, 4-MeOC6H4; R3 = Ph] or chromone derivatives II [X = CH, N; R3 = t-Bu, Ph; R4 = H, 6-F, 7-F, 6,7-(MeO)2; R5 = Me, n-Bu, Ph, 3,4,5-(MeO)3C6H2, 2-naphthyl, etc.] via transition metal-free tandem reactions. Nucleophilic attack of α-cyano ketones R3C(O)CH2CN to alkynones R1C(O)CCR2 followed by intramol. nucleophilic addition/ring-opening furnished the cyano-containing alkenes I. In the cases of alkynones III (Z = Br, Cl, F) bearing an ortho-halide-substituted aryl ring, a further C-O bond coupling reaction occurred to afford chromone derivatives II in good to high yields. Various alkynones bearing alkyl or aryl substituents were compatible in the reaction. This reaction has the potential to become a general synthetic protocol for the preparation of cyano-substituted olefins and chromones due to the abundance of easily accessible starting materials possessing diverse substituent groups. In the part of experimental materials, we found many familiar compounds, such as 2-Bromonicotinaldehyde(cas: 128071-75-0Application of 128071-75-0)

2-Bromonicotinaldehyde(cas: 128071-75-0) belongs to pyridine. In industry and in the lab, pyridine is used as a reaction solvent, particularly when its basicity is useful, and as a starting material for synthesizing some herbicides, fungicides, and antiseptics.Application of 128071-75-0

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2018,Awwadi, Firas F.; Turnbull, Mark M.; Alwahsh, Manal I.; Haddad, Salim F. published 《May halogen bonding interactions compete with Cu···Cl semi-coordinate bonds? Structural, magnetic and theoretical studies of two polymorphs of trans-bis(5-bromo-2-chloro pyridine)dichlorocopper(II) and trans-bis(2,5-dichloropyridine)dichlorocopper(II)》.New Journal of Chemistry published the findings.Reference of 5-Bromo-2-chloropyridine The information in the text is summarized as follows:

Two polymorphs of Cu(25dcp)2Cl2 [Cu(25dcp)2Cl2_p1 and Cu(25dcp)2Cl2_p2] and Cu(5b2cp)2Cl2 [Cu(5b2cp)2Cl2_p1 and Cu(5b2cp)2Cl2_p2] were prepared and characterized by single crystal X-ray diffraction (25dcp = 2,5-dichloropyridine and 5b2cp = 5-bromo-2-chloropyridine). The four structures crystallize in the monoclinic crystal system: three of them (Cu(25dcp)2Cl2_p1, Cu(5b2cp)2Cl2_p2 and Cu(25dcp)2Cl2_p2) crystallize in the C2/c space group and the fourth one (Cu(5b2cp)2Cl2_p1) in the C2/m space group. Cu(5b2cp)2Cl2_p1 and Cu(25dcp)2Cl2_p1 are structurally isomorphous. The formation of two polymorphs for each complex is a result of competition between Cl···Cu semi-coordinate bonds and C-X···Cl-Cu (X = Cl or Br) halogen bonding interactions. The formation of C-X···Cl-Cu halogen bonding alone resulted in crystallization of Cu(25dcp)2Cl2_p1 and Cu(5b2cp)2Cl2_p1, whereas the formation of the Cu···Cl semi-coordinate bonds resulted in the formation of Cu(25dcp)2Cl2_p2 and Cu(5b2cp)2Cl2_p2. To our knowledge, these are the first examples in which the competition between the halogen bonding interactions and the semi-coordinate Cu···Cl resulted in the formation of different polymorphs. The calculated electrostatic potential was used to rationalize the formation of the different polymorphs. The magnetic properties of Cu(5b2cp)2Cl2_p1 were studied; it is found to obey an antiferromagnetic chain model. This magnetic behavior was rationalized using the two-halide exchange pathway. Structurally, Cu(5b2cp)2Cl2_p1 forms a chain structure based on Cu-Cl···Cl-Cu interactions. The mapped electron d. with spin d. showed the presence of a spin-d.-end-cap along the Cu-Cl bond. This spin-d.-end-cap corroborates the observed antiferromagnetic interactions. In the experiment, the researchers used 5-Bromo-2-chloropyridine(cas: 53939-30-3Reference of 5-Bromo-2-chloropyridine)

5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. Reference of 5-Bromo-2-chloropyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2018,Chen, Long; Zhu, Yueyue; Chen, Tieqiao; Liu, Long; Zhang, Ji-Shu; Han, Li-Biao published 《Direct C-OH/P(O)-H dehydration coupling forming phosphine oxides》.Organic & Biomolecular Chemistry published the findings.Reference of 2-(2-Hydroxyethyl)pyridine The information in the text is summarized as follows:

A t-BuONa-mediated C-OH/P(O)-H cross dehydration coupling to produce alkylphosphine oxides is developed. This reaction employed readily available alcs. and P(O)-H compounds as the starting materials, providing an efficient alternative method for constructing sp3 C-P bonds. A reasonable reaction path involving dehydration and subsequent regio-selective hydrophosphorylation of the resulting alkenes was proposed. In the experimental materials used by the author, we found 2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Reference of 2-(2-Hydroxyethyl)pyridine)

2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Reference of 2-(2-Hydroxyethyl)pyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Journal of Separation Science included an article by Jadda, Ramana; Madhumanchi, Sreenu; Suedee, Roongnapa. Product Details of 141-86-6. The article was titled 《Novel adsorptive materials by adenosine 5′-triphosphate imprinted-polymer over the surface of polystyrene nanospheres for selective separation of adenosine 5′-triphosphate biomarker from urine》. The information in the text is summarized as follows:

The authors have developed a method to assess ATP by adsorptive extraction using surface ATP-imprinted polymer over polystyrene nanoparticles (412 ± 16 nm) for selective recognition/separation from urine. Molecularly imprinted polymer was synthesized by emulsion copolymerization reaction using ATP as a template, functional monomers (methacrylic acid, N-iso-Pr acrylamide, and dimethylamino ethylmethacrylate) and a crosslinker, methylenebisacrylamide. The binding capacities of imprinted and non-imprinted polymers were measured using HPLC with UV detection with a detection limit of 1.6 ± 0.02μM of ATP in the urine. High binding affinity (QMIP, 42.65μmol/g), and high selectivity and specificity to ATP compared to other competitive nucleotides including ADP, AMP, and analogs such as adenosine, adenine, uridine, uric acid, and creatinine were observed The imprinting efficiency of imprinted polymer is 2.11 for urine (QMIP, 100.3μmol/g) and 2.51 for synthetic urine (QMIP, 48.5μmol/g). The extraction protocol was successfully applied to the direct extraction of ATP from spiked human urine indicating that this synthesized molecularly imprinted polymer allowed ATP to be preconcd. while simultaneously interfering compounds were removed from the matrix. These submicron imprinted polymers over nano polystyrene spheres have a potential in the pharmaceutical industries and clin. anal. applications. In the part of experimental materials, we found many familiar compounds, such as 2,6-Diaminopyridine(cas: 141-86-6Product Details of 141-86-6)

2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Product Details of 141-86-6

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Chemistry – A European Journal included an article by Ramu, Vadde; Upendar Reddy, Gandra; Liu, Jingjing; Hoffmann, Patrick; Sollapur, Rudrakant; Wyrwa, Ralf; Kupfer, Stephan; Spielmann, Christian; Bonnet, Sylvestre; Neugebauer, Ute; Schiller, Alexander. Application In Synthesis of Bis(pyridin-2-ylmethyl)amine. The article was titled 《Two-Photon-Induced CO-Releasing Molecules as Molecular Logic Systems in Solution, Polymers, and Cells》. The information in the text is summarized as follows:

Phototherapeutic applications of carbon monoxide (CO)-releasing mols. are limited because they require harmful UV and blue light for activation. We describe two-photon excitation with NIR light (800 nm)-induced CO-release from two MnI tricarbonyl complexes bearing 1,8-naphthalimide units (1, 2). Complex 2 behaves as a logic OR gate in solution, nonwovens, and in HeLa cells. CO release, indicated by fluorescence enhancement, was detected in solution, nonwoven, and HeLa cells by single- (405 nm) and two-photon (800 nm) excitation. The photophys. properties of 1 and 2 have been measured and supported by DFT and TDDFT quantum chem. calculations Both photoCORMs are stable in the dark in solution and noncytotoxic, leading to promising applications as phototherapeutics with NIR light. The results came from multiple reactions, including the reaction of Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Application In Synthesis of Bis(pyridin-2-ylmethyl)amine)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. As a tridentate ligand this compound provides three nitrogen donors that affords good selectivity for Zn2+ over biologically relevant metals such as Na+, K+, Mg2+ and Ca2+, and leaves coordination sites free for anion binding. Application In Synthesis of Bis(pyridin-2-ylmethyl)amine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Synthesis and docking studies of 1-(2-fluorophenyl)-3-(4-((pyridine-2-yl)methyl)piperazine-1-yl)-1H-indazole》 were Balaraju, V.; Kalyani, S.; Laxminarayana, E.. And the article was published in Rasayan Journal of Chemistry in 2019. Computed Properties of C6H7Br2N The author mentioned the following in the article:

Novel compound 1-(2-fluorophenyl)-3-(4-((pyridin-2-yl)methyl)piperazin-1-yl)-1H-indazole was synthesized in a simple and efficient process. All the synthesized compounds were characterized by spectral anal. Further, docking studies for this titled compound was also presented in this communication. After reading the article, we found that the author used 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Computed Properties of C6H7Br2N)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Computed Properties of C6H7Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Push-pull isomers of indolizino[6,5,4,3-def]phenanthridine decorated with a triarylboron moiety》 were Dong, Lei; Saraci, Felix; Yuan, Kang; Wang, Xiang; Wang, Suning. And the article was published in Organic & Biomolecular Chemistry in 2019. Computed Properties of C6H6BrN The author mentioned the following in the article:

1,3-Dipolar cycloaddition reactions between a new azomethine ylide and three BPhMes2-functionalized internal alkynes produced three pairs of fluorescent push-pull regioisomers I and II (R = 2,4,6-Me3C6H2; 1a-3a, 1b-3b, resp., Ar = C6F5, 5-trifluoromethyl-2-pyridyl, 5-methyl-2-pyridyl), which show distinct electronic and photophys. properties. All the six compounds are found to exhibit charge-transfer (CT) fluorescence, and some of which show rare and interesting temperature “”turn-on”” fluorescence. The experimental process involved the reaction of 2-Bromo-5-methylpyridine(cas: 3510-66-5Computed Properties of C6H6BrN)

2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. Pyridines form stable salts with strong acids. Pyridine itself is often used to neutralize acid formed in a reaction and as a basic solvent. Computed Properties of C6H6BrN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Realization of Highly Efficient Red Phosphorescence from Bis-Tridentate Iridium(III) Phosphors》 were Gnanasekaran, Premkumar; Yuan, Yi; Lee, Chun-Sing; Zhou, Xiuwen; Jen, Alex K.-Y.; Chi, Yun. And the article was published in Inorganic Chemistry in 2019. Formula: C5H3Br2N The author mentioned the following in the article:

Bis-tridentate Ir(III) metal complexes bring forth interesting photophys. properties, among which the orthogonal arranged, planar tridentate chelates could increase the emission efficiency due to the greater rigidity and, in the meantime, allow strong interligand stacking that could deteriorate the emission efficiency. The authors bypassed this hurdle by design of 5 bis-tridentate Ir(III) complexes (1-5), to which both of their monoanionic ancillary and dianionic chromophoric chelate were functionalized derivative of 2-pyrazolyl-6-phenylpyridine, i.e. pzpyphH2 parent chelate. Hence, addition of Ph substituent to the pyrazolyl fragment of pzpyphH2 gave rise to the precursors of monoanionic chelate (A1H-A3H), on which the addnl. CMe3 and/or methoxy groups were introduced at the selected positions for tuning their steric and electronic properties, while precursors of dianionic chelates was judiciously prepared with an isoquniolinyl central unit on pziqphH2 in giving the red shifted emission (cf. L1H2 and L2H2). Factors affected their photophys. properties were discussed by theor. methods based on DFT and TD-DFT calculation, confirming that the T1 excited state of all studied Ir(III) complexes shows a mixed metal-to-ligand charge transfer (MLCT), intraligand charge transfer (ILCT), ligand-to-ligand charge transfer (LLCT), and ligand-centered (LC) transition character. But the poor quantum yield of 3 is due to the facilitation of the nonradiative decay in comparison to the radiative process. As for potential OLED applications, Ir(III) complex 2 gives superior performance with maximum efficiencies of 28.17%, 41.25 cd A-1 and 37.03 lm W-1, CIEx,y = 0.63, 0.37 at 50 mA cm-2, and small efficiency roll-off. Crystallog. data are given. In the part of experimental materials, we found many familiar compounds, such as 2,6-Dibromopyridine(cas: 626-05-1Formula: C5H3Br2N)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.Formula: C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Synthesis and structure of lithium 3-trifluoromethyl-1,3-diketonates containing pyridyl substituents》 were Slepukhin, P. A.; Boltacheva, N. S.; Filyakova, V. I.; Charushin, V. N.. And the article was published in Russian Chemical Bulletin in 2019. HPLC of Formula: 1122-54-9 The author mentioned the following in the article:

Lithium 3-trifluoromethyl-1,3-diketonates containing pyridyl substituents were synthesized. The specific features of the crystal structures of Li (Z)-1,1,1-trifluoro-4-oxo-4-(pyridin-3-yl)- and (Z)-1,1,1-trifluoro-4-oxo-4-(pyridin-4-yl)but-2-en-2-olates were revealed by x-ray diffraction. These compounds have a polymeric structure with Li cations in different coordination modes. The 1,3-diketonate group is involved in chelation and formation of O bridges, thereby linking two types of Li atoms. The results came from multiple reactions, including the reaction of 4-Acetylpyridine(cas: 1122-54-9HPLC of Formula: 1122-54-9)

4-Acetylpyridine(cas: 1122-54-9) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.HPLC of Formula: 1122-54-9

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Study of energy transfer mechanism in the EuIII and GdIII homobimetallic complexes containing the anti-inflammatory drug naproxen and N,N-donors ligands》 were Gomes, Emmanuel M.; Franco, Douglas F.; Scarpari, Sergio L.; Colaco, Marcos V.; Ferreira, Monica S.; Freire, Ricardo O.; Marques, Lippy F.. And the article was published in Journal of Luminescence in 2019. Application of 1134-35-6 The author mentioned the following in the article:

In this work, we present the synthesis, solid state characterization and complete photoluminescence study of new important homobimetallic lanthanide complexes containing the non-steroidal anti-inflammatory drug (NSAID) naproxen. The anal. and spectroscopic techniques reveals the formation of eight compounds of general formula [Ln2(nap)6(H2O)4] (Eu 1 and Gd 2), [Ln2(nap)6(bpy)2] (Eu 3 and Gd 4), [Ln2(nap)6(4,4′-dmbpy)2] (Eu 5 and Gd 6) and [Ln2(nap)6(phen)2] (Eu 7 and Gd 8), where: nap = naproxen ligand, bpy =2,2′-bipyridine, 4,4′-dmbpy = 4,4′-dimethyl-2,2′-bipyridine and phen = 1,10-phenanthroline. Using the RM1 model, the mol. structures of the EuIII complexes were calculated, with your optimized ground state geometries used to obtain all details involved in the energy transfer process. From the resp. GdIII complexes were obtained the lowest ligand triplet states, proving that the photoluminescence in the EuIII naproxen complexes is proposed to be a ligand sensitized luminescence process. On the other hand, the position of the triplet states also explains the non-effective energy transfer in the TbIII naproxen complexes. The presence of N,N-donors ligands (bpy, 4,4′-dmbpy and phen) results in an 3-4-fold increase in the quantum efficiency when compared with the EuIII complex without nitrogen ligands. The high values of emission quantum efficiency (η ∼ 70 – 98%) show the EuIII complexes can be potential candidates as emitters in biol. assays. After reading the article, we found that the author used 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Application of 1134-35-6)

4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.Application of 1134-35-6 Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem