Category: chiral-oxygen-ligands

Application In Synthesis of 3-Methyl-1H-pyrrole. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 3-Methyl-1H-pyrrole, is researched, Molecular C5H7N, CAS is 616-43-3, about Computational Design and Electropolymerization of Molecularly Imprinted Poly(p-Aminobenzoic-Acid-Co-Dapsone) Using Multivariate Optimization for Tetradifon Residue Analysis. Author is Ganjeizadeh Rohani, Fatemeh; Mohadesi, Alireza; Ansari, Mehdi.

In this study, tetradifon as a non-electroactive pesticide was measured by a new gold electrode modified with electropolymerized molecularly imprinted poly(para aminobenzoic acid-co-4,4-diaminodiphenyl sulfone) (P-pABA-co-DDS). The best available monomer was selected based on computational design and then the polymer was developed in optimized condition. Screening of various factors was performed by Plackett-Burman design (PBD) and central composite design (CCD) was utilized to select optimized condition. Under the optimized condition, calibration curve of tetradifon on MIP/gold electrode was constructed with a linear range of 0.05- 2.50μM. The limit of detection (LOD) and limit of quantification (LOQ) was found to be 0.014 and 0.047μM, resp. The developed method showed good stability, repeatability, and reproducibility, sensitivity and selectivity for tetradifon. The developed method was applied to determine tetradifon in real water samples.

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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 preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: cis-4-Aminocyclohexane carboxylic acid( cas:3685-23-2 ) is researched.Recommanded Product: 3685-23-2.Biancalana, Lorenzo; Bresciani, Giulio; Marchetti, Fabio; Pampaloni, Guido published the article 《Serendipitous Formation of a Zwitterionic Imidazolium Molecule from α-Diimine with Glyoxal as Unusual Cyclization Agent》 about this compound( cas:3685-23-2 ) in ChemistrySelect. Keywords: bis carboxycyclohexyl imidazole preparation; aminocyclohexane carboxylic acid glyoxal cyclization. Let’s learn more about this compound (cas:3685-23-2).

The serendipitous discovery of the unprecedented route to a zwitterionic imidazolium mol. with the two nitrogen atoms substituted with 4-cyclohexanecarboxylic acid was reported. To build the five-membered ring, glyoxal played the double role of source for C2 and unusually C1 units, the latter via thermal decomposition afforded carbon monoxide as side-product. The product was characterized by elemental anal., multinuclear NMR, IR and ESI-MS spectroscopy.

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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

Name: 5,6-Dichloropyrazine-2,3-dicarbonitrile. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile, is researched, Molecular C6Cl2N4, CAS is 56413-95-7, about Synthesis and characterization of non-aggregating octa-substituted azaphthalocyanines bearing bulky phenoxy substituents. Author is Makhseed, Saad; Samuel, Jacob; Ibrahim, Fadi.

The synthesis and characterization of two novel series of octaazaphthalocyanines (AzaPc) bearing bulky phenoxy substituents are described. Target precursors to AzaPcs derivatives were prepared by using a nucleophilic aromatic substitution reaction between sterically hindered phenols (2,6-di-iso-propylphenol and 2,6-diphenylphenol) and 5,6-dichloropyrazine-2,3-dicarbonitrile. UV-vis and 1H NMR analyses confirm that steric isolation of the AzaPcs cores enforced both in the solution and in the solid state. This study explores the effectiveness of the steric factor imposed by the applied bulky phenoxy substituents on the packing behavior of azaphthalocyanines and thereby improving their solubility and photo-phys. properties.

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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

Hlouskova, Zuzana; Tydlitat, Jiri; Kong, Manman; Pytela, Oldrich; Mikysek, Tomas; Klikar, Milan; Almonasy, Numan; Dvorak, Miroslav; Jiang, Zhiyong; Ruzicka, Ales; Bures, Filip published an article about the compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile( cas:56413-95-7,SMILESS:N#CC1=NC(Cl)=C(Cl)N=C1C#N ).Reference of 5,6-Dichloropyrazine-2,3-dicarbonitrile. 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:56413-95-7) through the article.

A series of dicyanopyrazine and dicyanoimidazole derived push-pull mols. have been prepared and further investigated as photoredox catalysts. The fundamental properties of the catalysts were studied by DSC, X-ray anal., absorption/emission spectra, and electrochem. and were completed with the DFT results. The catalytic activity has been evaluated in visible light induced α-functionalization of amines (cross-dehydrogenative coupling and annulation reaction of tetrahydroisoquinolines). Thorough structure-property-catalytic activity relationships were elucidated. The developed series of tailored organic photoredox catalysts allows synthetic chemists to perform desired reactions under sustainable and mild conditions employing solely visible light as a source of energy.

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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

Reference of 3-Methyl-1H-pyrrole. 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 Photosensitized oxygenation of 3-methylpyrrole involving a dioxetane intermediate. Author is Lightner, David A.; Low, Lawrence K..

The Rose Bengal-sensitized photooxidation of 3-methylpyrrole in MeOH gave 3% 3-methyl-3-methoxy-4-pyrrolin-2-one and 6% 3-hydroxy-3-methyl-4-pyrrolin-2-one via a dioxetane intermediate, 22% 3-methyl-5-methoxy-3-pyrrolin-2-one, 7% 4-methyl-5-methoxy-3-pyrrolin-2-one, 10% 5-hydroxy-3-methyl-3-pyrrolin-2-one, and 13% citraconimide.

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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.van Bergen, Pim F.; Flannery, Matthew B.; Poulton, Paul R.; Evershed, Richard P. researched the compound: 3-Methyl-1H-pyrrole( cas:616-43-3 ).Recommanded Product: 3-Methyl-1H-pyrrole.They published the article 《Organic geochemical studies of soils from Rothamsted Experimental Station: III. Nitrogen-containing organic matter in soil from Geescroft Wilderness》 about this compound( cas:616-43-3 ) in ACS Symposium Series. Keywords: nitrogen soil organic matter. We’ll tell you more about this compound (cas:616-43-3).

Three distinct soil horizons from a mature oak dominated woodland were studied in order to determine the changes in the mol. composition of nitrogen-containing organic matter down a soil profile. The total amount of nitrogen relative to soil organic carbon increased down the profile with most of the recognizable nitrogen-containing compounds in the leaf litter and humic horizon being either amino acid or amino sugar derived. In contrast, a significant proportion of the organic nitrogen moieties in the mineral horizon appeared to contain macromol.-bound nitrogen which is believed to represent the socalled “”unknown”” soil organic nitrogen and is not obviously related to known biomols. The increase in total amino acids in the humic and mineral horizons indicated contributions from sources other than the leaf litter. The increase in organic nitrogen-containing moieties, most probably amino acids derived, accounted for the less depleted δ13C values observed in the mineral soil horizon.

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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.Ikawa, Takashi; Takagi, Akira; Kurita, Yurio; Saito, Kozumo; Azechi, Kenji; Egi, Masahiro; Kakiguchi, Keisuke; Kita, Yasuyuki; Akai, Shuji researched the compound: 3-Methyl-1H-pyrrole( cas:616-43-3 ).Synthetic Route of C5H7N.They published the article 《Preparation and regioselective Diels-Alder reactions of borylbenzynes: synthesis of functionalized arylboronates》 about this compound( cas:616-43-3 ) in Angewandte Chemie, International Edition. Keywords: Diels Alder cycloaddition iodophenol triflate boryl benzyne furan pyrrol; benzyne generation pinacolboryl substituted iodophenol triflate furan pyrrol cycloaddition; boronate naphthyl preparation epoxy imino Diels Alder cycloaddition benzyne; aromatic amine phenol boronate preparation cycloaddition benzyne furan pyrrol; regioselective Diels Alder cycloaddition arylboronate benzyne furan pyrrol. We’ll tell you more about this compound (cas:616-43-3).

1,3,2-Dioxaborolan-2-yl benzynes, generated from 2-Bpin-4-R1-6-iodophenol triflates [6a-d; Bpin = B(OCMe2)2] undergo regioselective Diels-Alder cycloaddition with 2-R2-furans and 2-R2-4-R3-1-R4-1H-pyrroles, yielding the corresponding functionalized boronates I (4a-m; R1 = H, Me, Br, CO2Me; R2 = Me, Bu, tBu, SiMe3, SnBu3, CO2Me, COMe, CN, Ph, OMe) and II (same R1, R2 = H, Et, CH2CH2Ph; R3 = H, Me; Z = NTs, NBoc) with high yields and 87-98% regioselectivities. The benzyne formation was promoted by iPrMgCl/LiCl reagent. The boronate group was successfully converted into butylamino, hydroxy and Ph groups following common procedures.

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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 preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 3-Methyl-1H-pyrrole( cas:616-43-3 ) is researched.Reference of 3-Methyl-1H-pyrrole.Groves, J. K.; Anderson, Hugh J.; Nagy, H. published the article 《Pyrrole chemistry. XIII. New syntheses of 3-alkylpyrroles》 about this compound( cas:616-43-3 ) in Canadian Journal of Chemistry. Keywords: pyrrole alkyl preparation. Let’s learn more about this compound (cas:616-43-3).

3-n-Alkylpyrroles are prepared in good yield by a combined Wolff-Kishner reduction and hydrolysis and decarboxylation of 4-acyl-2-pyrrole-thiolcarboxylates. Me 4-isopropyl-2-pyrrolecarboxylate and 4-tert-butyl-2-pyrrolecarbonitrile are prepared by alkylation of Me 2-pyrrolecarboxylate and 2-pyrrolecarbonitrile, resp. Hydrolysis and decarboxylation of these disubstituted compounds afford the corresponding-3-alkylpyrroles. Mass spectral data for some 1-, 2-, and 3-alkylpyrroles are reported.

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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

Name: 5,6-Dichloropyrazine-2,3-dicarbonitrile. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: 5,6-Dichloropyrazine-2,3-dicarbonitrile, is researched, Molecular C6Cl2N4, CAS is 56413-95-7, about Syntheses of Octa(dialkylamino)azaphthalocyanines. Author is Morkved, Eva H.; Kjosen, Helge; Ossletten, Hege; Erchak, Nikolai.

Ni(II) octa(4-morpholinyl)- (11a) and Cu(II) octa(1-pyrrolidinyl)- (11b) azaphthalocyanines were prepared from the corresponding pyrazine diiminoimides (10). The precursor pyrazine dicarbonitriles (2) gave 6-cyanopyrazine-5-alkyl carboximidates (3-9) as stable intermediates when reacted with NH3 and catalytic amounts of Na alkoxide in alcs. 3-9 Were converted to the diiminoimides 10 upon reflux in PrOH or BuOH for several hours. This unusual reaction pattern was observed for pyrazine-2,3-dicarbonitriles (2) with morpholine, thiomorpholine, piperidine or pyrrolidine substituted in the 5- and 6-positions.

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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 《Thermal reactions of organic nitrogen compound. I. I-Methylpyrrole》. Authors are Jacobson, I. A. Jr.; Heady, H. H.; Dinneen, G. U..The article about the compound:3-Methyl-1H-pyrrolecas:616-43-3,SMILESS:CC1=CNC=C1).Recommanded Product: 616-43-3. Through the article, more information about this compound (cas:616-43-3) is conveyed.

A flow method was used at 475-700°. At 475-575° the reaction was a homogeneous 1st-order isomerization, 1-methylpyrrole → 2-methylpyrrole → 3-methylpyrrole. The Arrhenius equation for this reaction, based on the disappearance of 1-methylpyrrole, is k = 2.39 × 1012e(-54,800/RT). Above 575° there was decomposition to give a complex mixture of reaction products.

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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