Chiral oxygen ligands

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Bhosle, Govind S.; Fernandes, Moneesha researched the compound: cis-4-Aminocyclohexane carboxylic acid( cas:3685-23-2 ).Product Details of 3685-23-2.They published the article 《(R-X-R)4-motif peptides containing conformationally constrained cyclohexane-derived spacers: Effect on cellular uptake》 about this compound( cas:3685-23-2 ) in ChemMedChem. Keywords: cell penetrating peptide derivative preparation role cellular uptake; (R-X-R)-motif; cell-penetrating peptides; cellular uptake; protease stability. We’ll tell you more about this compound (cas:3685-23-2).

Arg residue-rich peptides having the (R-X-R)n motif are among the most effective cell-penetrating peptides (CPPs). Here, we report a several-fold increase in the efficacy of such CPPs if the linear flexible spacer (-X-) in the (R-X-R) motif is replaced by constrained cyclic 1,4-substituted-cyclohexane-derived spacers. Internalization of these oligomers in mammalian cell lines was found to be an energy-dependent process. Incorporation of these constrained, non-proteinogenic amino acid spacers in the CPPs was shown to enhance their proteolytic stability.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

SDS of cas: 56413-95-7. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile, is researched, Molecular C6Cl2N4, CAS is 56413-95-7, about Reaction of 2,3-dichloro-5,6-dicyanopyrazine with enamines and some tertiary amines. Author is Hou, Dongfeng; Oshida, Atsushi; Matsuoka, Masaru.

The reaction of 2,3-dichloro-5,6-dicyanopyrazine with enamines as well as a few tertiary amines as enamine precursors was investigated. Both reactions gave aminovinyl-substituted pyrazine derivatives such as I. The products prepared are all of interest as potential pesticides.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Effect of structure on the separation of 2- and 3-alkylpyrroles by gas chromatography》. Authors are Bean, Gerritt P..The article about the compound:3-Methyl-1H-pyrrolecas:616-43-3,SMILESS:CC1=CNC=C1).Reference of 3-Methyl-1H-pyrrole. Through the article, more information about this compound (cas:616-43-3) is conveyed.

The Cu columns were 2- and 5-m. lengths of 0.25 in. inside diameter packed with Tide mesh size 40-80. Flow rate of He was 50ml. min. The temperature of the column was 150°. The ethylpyrroles were completely separated on the 5-m. Tide column and the other alkylpyrroles were separated on the 2-m. column, however 2- and 3-methylpyrroles are not separated The retention time of 2,5-dimethylpyrrole is slightly shorter and the retention time of the 2,4-dimethylpyrrole is longer than that of 2-ethylpyrrole.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

HPLC of Formula: 616-43-3. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 3-Methyl-1H-pyrrole, is researched, Molecular C5H7N, CAS is 616-43-3, about 14N nuclear quadrupole coupling and methyl internal rotation in 3-methylpyrrole investigated by microwave spectroscopy. Author is Nguyen, Thuy; Stahl, Wolfgang; Nguyen, Ha Vinh Lam; Kleiner, Isabelle.

The mol. structure of 3-methylpyrrole in the gas phase has been determined using a combination of high-resolution spectroscopy and quantum chem. calculations The rotational spectrum was recorded using a mol. jet Fourier transform microwave spectrometer covering the frequency range from 2.0 to 26.5 GHz. The exptl. data were analyzed using the programs XIAM and BELGI-Cs-hyperfine. Because the internal rotor axis accidentally lies along the principal a-axis of inertia, the rho axis system and the principal axis system coincide, enabling a direct comparison of the fits. With the program XIAM, the rotational constants A = 8631.1629(12), B = 3342.19750(43), and C = 2445.73846(42) MHz were obtained. Torsional splittings due to internal rotation of the Me group were observed, leading to the determination of the V3 potential of 245.92445(31) cm-1. Hyperfine splittings arising from the nuclear quadrupole coupling of the 14N nucleus could be resolved, and the quadrupole coupling constants χaa = 1.4159(49) and χbb – χcc = 4.1622(86) MHz were found.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Electric Literature of C6Cl2N4. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile, is researched, Molecular C6Cl2N4, CAS is 56413-95-7, about Effective Monofunctional Azaphthalocyanine Photosensitizers for Photodynamic Therapy. Author is Zimcik, Petr; Miletin, Miroslav; Novakova, Veronika; Kopecky, Kamil; Nejedla, Marcela; Stara, Vendula; Sedlackova, Katerina.

In this work we present a rational design of the active part of third generation photosensitizers for photodynamic therapy based on phthalocyanine and an azaphthalocyanine core. The preferred zinc complexes of the AAAB type that contain bulky tert-butylsulfanyl substituents (A) and one carboxy group (B) have been synthesized by statistical condensation and fully characterized. The tetramerization was performed using magnesium(ii) butoxide followed by demetalation and insertion of ZnII. Compound 1 synthesized from 4,5-bis(tert-butylsulfanyl)phthalonitrile (A) and 2,3-dicyanoquinoxaline-6-carboxylic acid (B) exerted very promising photophys. properties (Q-band absorption at 726 nm, ε = 140000 M-1 cm-1), which allowed strong absorption of light at long wavelengths where the penetration of the light through human tissues is deeper. The very high singlet oxygen quantum yield of 1 (ΦΔ = 0.80) assures efficient photosensitization. As a result of bulky peripheral substituents, compound 1 shows good solubility in organic solvents with a low degree of aggregation, which makes it potentially viable for noncomplicated modification. One carboxy group in the final structure of 1 allows simple binding to possible carriers. This compound is suitable for binding to targeting moieties to form the highly active part of a third-generation photosensitizer.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: cis-4-Aminocyclohexane carboxylic acid, is researched, Molecular C7H13NO2, CAS is 3685-23-2, about Synthesis and antitumor activity of nonsymmetric phosphoric acid triamides, the main research direction is phosphoric acid triamide nonsym preparation acute toxicity antitumor activity; amide phosphoric acid nonsym preparation acute toxicity antitumor activity.Formula: C7H13NO2.

R1R2P(O)NHR3 (R1, R2 independently = aziridino, N(CH2CH2Cl)2, NMe2, morpholino or NHCH2CH2OH; R3 = 4-R-substituted cyclohexyl (R = H, cis- and trans-CO2H, cis- and trans-CO2Et)) were prepared and tested for acute toxicity and antitumor activity. All the 12 tested compounds possess a lower antitumor activity as compared to that of the reference drug thiophosphamide. The antitumor activity of nonsym. phosphoric acid triamides is determined for the most part by the nature of amide residues attached at the P atom. The antitumor effect can be varied within a broad range by changing this residue, the maximum antitumor activity being inherent in nonsym. triamides containing the ethylenimine residue.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Computed Properties of C7H13NO2. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: cis-4-Aminocyclohexane carboxylic acid, is researched, Molecular C7H13NO2, CAS is 3685-23-2, about Approaches towards the synthesis of fluoro(cyclo)alkylamines. Author is Windhorst, A. D.; Bechger, L.; Visser, G. W. M.; Menge, W. P. M. B.; Leurs, R.; Timmerman, H.; Herscheid, J. D. M..

The synthesis of fluoro(cyclo)alkylamines 1-amino-6-fluorohexane, 1-amino-7-fluoroheptane, cis/trans-4-fluorocyclohexylamine and cis-4-fluoromethylcyclohexylamine has been investigated for use as synthons for histamine receptor ligands for use in PET.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Application of 56413-95-7. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile, is researched, Molecular C6Cl2N4, CAS is 56413-95-7, about Low-Power Laser Ignition of an Antenna-Type Secondary Energetic Copper Complex: Synthesis, Characterization, Evaluation, and Ignition Mechanism Studies. Author is Shem-Tov, Daniel; Petrutik, Natan; Wurzenberger, Maximilian H. H.; Meincke, Melanie; Flaxer, Eli; Tumanskii, Boris; Zhang, Lei; Dobrovetsky, Roman; Fleischer, Sharly; Klapotke, Thomas M.; Stierstorfer, Jorg.

In recent years, development of new energetic compounds and formulations, suitable for ignition with relatively low-power lasers, is a highly active and competitive field of research. The main goal of these efforts is focused on achieving and providing much safer solutions for various detonator and initiator systems. In this work, a new laser-ignitable compound, based on the 5,6-bis(ethylnitroamino)-N′2,N′3-dihydroxypyrazine-2,3-bis(carboximidamide) (DS3) proligand is prepared, characterized, and thermal and ignition properties are studied. This new energetic proligand was prepared in three steps, starting with 5,6-bis(ethylamino)-pyrazine-2,3-dicarbonitrile. Crystallog. studies of the DS3-derived Cu(II) complex (DS4) revealed a unique stacked antenna-type structure of the latter compound DS4 has an exothermal temperature of 154.5° and was calculated to exhibit a velocity of detonation of 6.36 km·s-1 and a detonation pressure of 15.21 GPa. DS4 showed properties of a secondary explosive, having sensitivity to impact, friction, and electrostatic discharge of 8 J, 360 N, and 12 mJ, resp. In order to study the mechanism of ignition by a laser (using a diode laser, 915 nm), a set of experiments are conducted that enabled to characterize a photothermal ignition mechanism. Furthermore, it was found that a single pulse, with a time duration of 1 ms and with a total energy of 4.6 mJ, was sufficient for achieving a consistent and full ignition of DS4. Dual-pulse experiments, with variable time intervals between the laser pulses, showed that DS4 undergoes ignition via a photothermal mechanism. Finally, calculating the chem. mechanism of the formation of the complex DS4 and modeling its anhydrous and hydrated crystal structures (d. functional theory calculations using Gaussian and HASEM software) allowed to pinpoint a more precise location of water mols. in exptl. crystallog. data. These results suggest that DS4 has potential for further development to a higher technol. readiness level and for integration into small-size safe detonator systems as for many civil, aerospace, and defense applications.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

Palaima, A.; Poskiene, R.; Karpavicius, K.; Kil’disheva, O. V.; Knunyants, I. L. published an article about the compound: cis-4-Aminocyclohexane carboxylic acid( cas:3685-23-2,SMILESS:N[C@H]1CC[C@H](CC1)C(O)=O ).COA of Formula: C7H13NO2. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:3685-23-2) through the article.

Mixtures of cis- and trans-3-(I) and 4-aminocyclohexanecarboxylic acid (II) were obtained by hydrogenation of the corresponding aminobenzoic acids. Trans-II and cis-I were obtained in 85 and 83% yield, resp., by separation of the mixture on a KU-2 cation exchanger. Cis-II was isomerized to 90% trans-II in the presence of 2% NaOH and Ni/Re catalyst. The Et and Me esters of the title compounds were also obtained.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Takeda, Takashi; Ikemoto, Tomohiro; Yamamoto, Shunsuke; Matsuda, Wakana; Seki, Shu; Mitsuishi, Masaya; Akutagawa, Tomoyuki researched the compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile( cas:56413-95-7 ).Related Products of 56413-95-7.They published the article 《Preparation, Electronic and Liquid Crystalline Properties of Electron-Accepting Azaacene Derivatives》 about this compound( cas:56413-95-7 ) in ACS Omega. Keywords: preparation electronic liquid crystalline property electron accepting azaacene derivative. We’ll tell you more about this compound (cas:56413-95-7).

A series of electron-accepting azaacene-type materials with different kinds and degrees of intermol. interactions were synthesized. Simple modification of the terminal substituents significantly modulated the photophys. and electrochem. properties. The degree of the weak intermol. interaction determined the emergence of a liquid crystalline (LC) phase for each compound Dipole-dipole interaction, π-π interaction and van der Waals interaction all contributed to stabilize the LC phase of I [R = C6H13, C12H25, C18H37] and II. The introduction of strong hydrogen bonding interaction enabled the formation of a highly ordered LC phase in III. Charge-transport properties of I, II and III were also investigated.

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Reference:
Synthesis and Crystal Structure of a Chiral C3-Symmetric Oxygen Tripodal Ligand and Its Applications to Asymmetric Catalysis,
Chiral lanthanide(III) complexes of sulphur–nitrogen–oxygen ligand derived from aminothiourea and sodium D-camphor-β-sulfonate