Month: April 2022

Recommanded Product: Bromoferrocene. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Bromoferrocene, is researched, Molecular C10BrFe, CAS is 1273-73-0, about Stable σH-adducts in reactions of ferrocenyllithium with azines. Author is Utepova, I. A.; Lakhina, A. E.; Varaksin, M. V.; Kovalev, I. S.; Rusinov, V. L.; Slepukhin, P. A.; Kodess, M. I.; Chupakhin, O. N..

Stable σH-adducts as intermediates of the nucleophilic substitution of H in 3-(2-pyridyl)-1,2,4-triazines were obtained using ferrocenyllithium as a nucleophilic reagent. The 3D structures of the reaction products were established by an x-ray diffraction study on 1-[4-ethyl-6-phenyl-3-(2-pyridyl)-5(H)-1,2,4-triazin-5-yl]ferrocene [monoclinic, space group P21/c, a 9.3471(8), b 20.7674(13), c 10.7865(10) Å, β 96.248(7)°, V 2081.4(3) Å3, Z 4].

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Reference:
Thiazolidine – Wikipedia,
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Recommanded Product: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about Ethyl 3,5-dimethyl-1H-pyrrole-2-carboxylate. Author is Arranja, Claudia T.; Ramos Silva, Manuela; Matos Beja, Ana; Ferreira, Ana F. P. V.; Sobral, Abilio J. F. N..

In the title compound, C9H13NO2, there are two independent mols. per asym. unit. The mols. are very similar and almost planar, with the ethoxycarbonyl group anti to the pyrrole N atom. The two independent mols. are joined into dimeric units by strong hydrogen bonds between NH groups and carbonyl O atoms. Crystallog. data are given.

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Thiazolidine – Wikipedia,
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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.Guseva, G. B.; Dudina, N. A.; Antina, E. V.; V’yugin, A. I.; Semeikin, A. S. researched the compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate( cas:2199-44-2 ).HPLC of Formula: 2199-44-2.They published the article 《Complexation between decamethyl-3,3′-bis(dipyrrolylmethene) and zinc(II), copper(II), and cobalt(II) acetates》 about this compound( cas:2199-44-2 ) in Russian Journal of Coordination Chemistry. Keywords: complexation zinc copper cobalt acetate decamethylbisdipyrrolylmethene preparation thermodn. We’ll tell you more about this compound (cas:2199-44-2).

Decamethylmethylene-3,3′-bis(dipyrrolylmethene) dihydrobromide H2L·2HBr, which is the simplest representative of a novel class of oligo(dipyrrolylmethenes) belonging to chromophore chelating nonmacrocyclic ligands, were examined by 1H NMR, IR, and electronic absorption spectroscopy. Complexation reactions of H2L·2HBr with M(AcO)2 (M = Zn(II), Cu(II), and Co(II)) in DMF at 298.15 K were monitored by electronic absorption spectroscopy and studied by the molar ratio method. The thermodn. constants K0 of these reactions were estimated The d metal ions coordinate H2L to give the binuclear homoleptic complexes [M2L2]. The reactions proceed through the intermediate binuclear heteroleptic complex [M2L(AcO)2] detected by spectroscopic methods. The thermodn. stabilities of [M2L2] and [M2L(AcO)2] increase when moving from Cu(II) to Zn(II) and Co(II). The probability of formation and stability of [M2L2] containing 3,3′-bis(dipyrrolylmethene) are substantially higher than those of analogous complexes with the 2,2′-isomer (decamethyl-2,2′-biladiene-a,c). The low K0 values for the complexation between H2L and Cu(AcO)2 are due to slow oxidation of the biladiene ligand into a bilatriene with participation of Cu2+ ions.

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Thiazolidine – Wikipedia,
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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Kinetics of pyrrole substitutions. Iodination reaction》. Authors are Doak, Kenneth W.; Corwin, Alsoph H..The article about the compound:Ethyl 3,5-Dimethyl-2-pyrrolecarboxylatecas:2199-44-2,SMILESS:O=C(C1=C(C)C=C(C)N1)OCC).Name: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. Through the article, more information about this compound (cas:2199-44-2) is conveyed.

The rates of iodination of 4 substituted pyrroles, measured in aqueous dioxane (28% dioxane by weight) at 26.5 ± 0.1°, follow 2nd-order equations. The substituents are methyl and carbethoxy groups. Reduction rates of 2 iodopyrroles with HI are also reported, one of which follows a 3rd order. From the data obtained it is shown that the α-position is about 25 times as reactive as the β-position. N-Methyl substitution increases the reactivity of the pyrrole ring 8 to 15% thus the effect is smaller than that of Me substitution on benzene. Similar studies of the reduction rates show the α-position to be 20 times as reactive towards reduction as the β-position. The iodination equilibrium constant K = [RI] [HSolv+] [I-]/[RH] [Solv] [I2], assuming the solvent as 48.2 M, is 24 for α-iodination and 21 for β-iodination, thus apparently little affected by structural changes.

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Thiazolidine – Wikipedia,
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Category: thiazolidine. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about Isolation and characterization of a novel tetrahydro-[2,2′]bipyrrolyl dimer as an impurity from a Knorr reaction. Author is Thompson, Alison; Alattar, Yousef; Beshara, Cory S.; Burley, Rodney K.; Cameron, T. Stanley; Robertson, Katherine N..

A dimer, tetra-Et 2,2′,3,3′-tetramethyl-1,1′,2,2′-tetrahydro-4H,4’H-2,2′-bipyrrolyl-5,5,5′,5′-tetracarboxylate (I), has been isolated as an impurity from a Knorr reaction for the synthesis of Et 3,5-dimethylpyrrole-2-carboxylate from 2,4-pentanedione and di-Et oximinomalonate in a dissolving zinc reduction The solid-state structure of I was determined by X-ray crystallog. Knorr reactions typically rely upon the requisite pyrrole being the only water-insoluble crystalline material present in the reaction mixture, and so work-up and purification procedures for Knorr reactions should be monitored carefully given the water-insolubility of this dimer.

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In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Some transformations of 2,4-dimethylpyrrole, published in 1923, which mentions a compound: 2199-44-2, mainly applied to , Recommanded Product: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate.

From 0.9 g. 2,4-dimethylpyrrole (I) and 0.8 g. MeCN in cold Et2O saturated with dry HCl and allowed to stand 1 day is obtained 0.7 g. of the ketimine, m. 100°, sublimes 100° (HCl salt, green needles), of 2,4-dimethyl-5-acetylpyrrole (II). The ketimine is reduced by H and Pt sponge in alc. to I and when boiled with H2O to disappearance of the NH3 odor, 0.7 g. of it gives 0.3 g. II, m. 121°. 2,4-Dimethyl-5-chloroacetylpyrrole (0.9 g. from 1 g. I and 1 g. MeCN in cold Et2O saturated with dry HCl and allowed to stand 0.5 hr. in ice), m. 143°, gives in alc. with 30% NHMe2 after 0.5 hr. at 100° the 5-dimethylaminoacetyl derivative, m. 110°, while 0.5 g. boiled 0.5 min. in alc. with 40% HCHO and a few drops concentrated HCl yields 0.4 g. bis-[2,4-dimethyl-5-chloroacetylpyrryl]methane, m. 258°, which with NHMe2 in alc. gives the bis-5-dimethylaminoacetyl derivative m. 170°. I (1 g.) boiled up several times with 2 g. of 90% HCO2H and 10 drops of 20% HClO4 and allowed to stand 1 day gives 0.5 g. of the perchlorate, becomes discolored 200°, does not m. 260°, of bis-[2,4-dimethyl-pyrryl]methene, yellow, m. 117°. 2,4-Dimethyl-5-carbethoxypyrrole (III), obtained in 60-70% yield from I and EtMgBr and subsequent treatment with ClCO2Et, m. 125°, gives a positive Ehrlich aldehyde reaction in the cold, is hydrolyzed by boiling 50% KOH to the free acid, m. 136°, also obtained from the above Grignard compound with CO2. 2,4-Dimethyl-5-carbethoxypyrrole-3-aldehyde (IV). obtained in 85% yield from III and HCN in cold Et2O saturated with dry HCl and subsequent decomposition of the resulting imide chloride with hot H2O, m. 145°, gives a faint Ehrlich aldehyde reaction in the cold, more strongly on heating; 3 g. heated with 1:1 KOH until completely dissolved (about 15 min.) gives 2.2 g. of the free 5-carboxyaldehyde, m. 230°, which on distillation in vacuo yields 2,4-dimethylpyrrole-3-aldehyde, m. 126°, gives a positive aldehyde reaction even in the cold. Phenylhydrazone of IV, m. 204°. Azlactone, C19H18O4N2 (1.3 g. from 1.2 g. IV, 1.8 g. hippuric acid, 2.2 g. NaOAc and 20 cc. Ac2O heated 35 min. on the H2O bath), m. 232°. Oxime, m. 196-7°, converted by boiling NaOAc-Ac2O into the nitrile, C10H12O2N2, m. 171°. Semicarbazone, m. 285° (decomposition), converted by Na in alc. after 8 hrs. at 160-70° into 2,3,4-trimethylpyrrole. 2,4-Dimethyl-5-carbethoxy-3-chloroacetylpyrrole, from III and ClCH2CN, m. 163°, gives a faint positive Ehrlich reaction on heating, is highly sternutatory when powdered, gives in boiling alc. with aqueous KCN the 3-cyanoacetyl derivative, m. 172-3°.

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Reference:
Thiazolidine – Wikipedia,
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Related Products of 15965-55-6. 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: 2-Chloro-7-nitro-1H-benzo[d]imidazole, is researched, Molecular C7H4ClN3O2, CAS is 15965-55-6, about Synthesis and biological activity of 5,6-dinitro derivatives of benzimidazole. Author is Chernova, E. Yu.; Mokrushina, G. A.; Chupakhin, O. N.; Kotovskaya, S. K.; Il’enko, V. I.; Andreeva, O. T.; Boreko, E. I.; Vladyko, G. V.; Korobchenko, L. V..

The title compounds I [R = H·HCl, Me; R1 = NH2NH, amino, azolyl (II)] were prepared from chlorobenzimidazoles I [R1 = Cl (III)]. III in turn, were prepared by the nitration of 2-chlorobenzimidazole. The antiviral and antimicrobial activity of II were examined

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Quality Control of Bromoferrocene. 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: Bromoferrocene, is researched, Molecular C10BrFe, CAS is 1273-73-0, about Alkoxylation of ferrocene by photolysis of haloferrocenes in aqueous alcohols. Author is Shibata, Katsuyoshi; Saito, Yoshiyuki; Matsui, Masaki; Takase, Yoshimi.

The UV irradiation of haloferrocenes I (R = Cl, Br, iodo) in aq R1OH (R1 = Me, Et, Pr, CHMe2, CMe3) resulted in an alcoholysis with the formation of 8-60% of the corresponding alkoxyferrocenes I (R = OR1) and 5-28% ferrocene. The order of the reactivities of I was R = iodo > Br > Cl.

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Thiazolidine – Wikipedia,
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Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 2199-44-2, is researched, Molecular C9H13NO2, about New fluorescent chemosensor for Zn2+ ions on the basis of 3,3′-bis(dipyrrolylmethene), the main research direction is fluorescent chemosensor zinc ion dipyrrolylmethene.Product Details of 2199-44-2.

Luminescence study of the reaction of 3,3′-methanediylbis(2,4,7,8,9-pentamethyldipyrrolylmethene) (H2L) with a number of metal salts showed that this compound is an efficient fluorescent chemosensor for Zn2+ ions in organic solvents. The selectivity and sensitivity of H2L were estimated in various solvents in the presence of other metal cations (Na+, Mg2+, Co2+, Ni2+, Cu2+, Cd2+, Hg2+, Pb2+).

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Thiazolidine – Wikipedia,
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Related Products of 2199-44-2. 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: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about The effect of electron-withdrawing groups on 15N and 13C chemical shifts: A density functional study on a series of pyrroles. Author is Mothana, B.; Ban, F.; Boyd, R. J.; Thompson, A.; Hadden, C. E..

Electron-withdrawing groups (EWGs) on the nitrogen atom of pyrroles have significant effects on the properties of the pyrrole. It has been suggested that the exptl. 13C chem. shifts show a general increase in deshielding effect with the increase of N-EWGs strength [A. Thompson, S. Gao, G. Modzelewska, D.S. Hughes, B. Patrick, D. Dolphin, Organic Lett., 2, 3587 (2000)]. However, recently observed 15N chem. shifts of pyrroles do not correlate with the N-EWG strength. To elucidate the relationship between the electronic structures of pyrroles and their nitrogen and carbon chem. shifts, d. functional theory calculations were performed on pyrroles with various substituents. A correlation between the paramagnetic shift and the 15N chem. shift was observed for the pyrroles, indicating that the nitrogen chem. shift trend for the pyrroles arises entirely from variations of the paramagnetic shift contribution. However, a general correlation between the 15N chem. shifts and the EWG strength does not exist. Natural chem. shielding (NCS) anal. shows that the changes in the σ(N5-R)-π* transitions and changes in the sum of the σ(C1-N5)-π* and σ(C4-N5)-π* transitions account for the nitrogen chem. shift trend observed in the pyrroles.

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Reference:
Thiazolidine – Wikipedia,
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