Month: April 2022

Category: thiazolidine. 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 Coordination chemistry of perhalogenated cyclopentadienes and alkynes. XXVIII new high-yield synthesis of monobromoferrocene and simplified procedure for the synthesis of pentabromoferrocene. Molecular structures of 1,2,3-tribromoferrocene and 1,2,3,4,5-pentabromoferrocene. Author is Suenkel, Karlheinz; Bernhartzeder, Stefanie.

Monobromoferrocene (1) was obtained in 95% yield from ferrocene via lithiation with tert-BuLi/KO-tert-Bu and bromination with dibromotetrachloroethane. Starting from 1 mixtures of 1,2-dibromoferrocene (2) and apparently unreacted 1 (ranging from 80:20 to 50:50, depending on the reaction conditions) can be obtained via a lithiation- zincation- bromination sequence. These mixtures can be transferred directly with a tenfold excess of Lithium-tetramethylpiperidinide, followed by bromination with 1,1,2,2-tetrabromoethane to pentabromoferrocene (3), in an overall yield of 36% starting from ferrocene. The mol. structures of 3 and of 1,2,3-tribromoferrocene (4) have been determined by X-Ray diffraction.

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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 The observation of ion-pairing effect based on substituent effect of ferrocene derivatives. Author is Shi, Yujie; Fang, Liu; Li, Xuan; Qu, Liangti; Shao, Huibo.

The ion-pairing effect was studied based on the substituent effect of ferrocene (Fc) derivatives using cyclic voltammetry. The presence of ion-pairing strongly affected the electrochem. redox behavior in the organic solvent. The formal redox potential (E0′, the average of anodic and cathodic peak potential) shifted neg. with the increasing ion-pairing effect. That was because the formation of ion pair (Fc+·ClO-4) was beneficial to equilibrium shift from Fc to Fc+ in thermodn. Electron-donating and electron-withdrawing substituents of ferrocene derivatives were employed for a deep study of ion-pairing effect, resp. Both ion-pairing effect and electron-donating substituent effect facilitated the neg. shift of E0′ for ferrocene derivatives, showing the pos. cooperativity. While the electron-withdrawing substituent effect resulted in the pos. shift of E0′ for ferrocene derivatives and was unfavorable for the oxidation of Fc derivatives, reflecting the neg. cooperativity with ion-pairing effect. The reversal phenomenon of weak electron-withdrawing substituent was revealed when the ion-pairing effect was stronger than the electron-withdrawing substituent effect, indicating that the ion-pairing function has a significant effect on electrochem. behavior of ferrocene derivatives

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Category: thiazolidine. 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 Synthesis and spectral properties of new 3,3′-bis(dipyrrolylmethene) with acetylene spacer. Author is Antina, E. V.; Guseva, G. B.; Loginova, A. E.; Semeikin, A. S.; V’yugin, A. I..

Bis(2,4,7,9-tetramethyl-8-ethyldipyrrolylmethen-3-yl)acetylene dihydrobromide (H2L·2HBr), new bis(dipyrrolylmethene), in whose mol. dipyrrolylmethene domains were connected through 3,3′-carbon atoms of internal pyrrole nuclei by acetylene spacer, were synthesized by original procedure. The compound was characterized by element anal., IR, 1H NMR, and electronic spectroscopy. The comparative anal. of spectral properties shows the reduction of the basicity of H2L ligand in comparison with the structural analogs, which contain internal methylene spacer. The quantum-chem. simulation showed that the rigid acetylene spacer gives linear structure to the H2L mol. in contrast to the spiral-shaped geometry of structural analogs with -CH2- spacer.

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Safety of Bromoferrocene. 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: Bromoferrocene, is researched, Molecular C10BrFe, CAS is 1273-73-0, about Synthesis of diferrocenylglyoxime and some of its transition-metal complexes. Author is Ertas, Mumtaz; Koray, Ali R.; Ahsen, Vefa; Bekaroglu, Ozer.

Diferrocenylglyoxime (I) was prepared by treating mono- or dilithioferrocene with anti-dichloroglyoxime. Characterization of this novel vic-dioxime and some of its transition metal complexes is described. E.g., treating NiCl2 with I in EtOH, followed by NaOH in EtOH, gave 60% Ni complex II (L = ferrocenyl).

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate( cas:2199-44-2 ) is researched.Category: thiazolidine.Berezin, M. B.; Semeikin, A. S.; Yutanova, S. L.; Antina, E. V.; Guseva, G. B.; V’yugin, A. I. published the article 《Synthesis and properties of (1,2,3,7,9-pentamethyldipyrrolylmethen-8-yl)-(1,2,3,7,8-pentamethyldipyrrolylmethen-9-yl)methane and bis(1,2,3,7,9-pentamethyldipyrrolylmethen-8-yl)trifluoromethylmethane dihydrobromides》 about this compound( cas:2199-44-2 ) in Russian Journal of General Chemistry. Keywords: bisdipyrrolylmethene preparation UVvis thermal oxidative degradation. Let’s learn more about this compound (cas:2199-44-2).

(1,2,3,7,9-Pentamethyldipyrrolylmethen-8-yl)(1,2,3,7,8-pentamethyldipyrrolylmethen-9-yl)-methane and bis(1,2,3,7,9-pentamethyldipyrrolylmethen-8-yl)trifluoromethylmethane hydrobromides were synthesized and characterized spectrally (1H NMR, IR, electron absorption spectra). A comparative study was performed of the effect of the bonding site (α- or β-position of the dipyrrolylmethene) with the methane structural fragment connecting two dipyrrolylmethene chromophores, and trifluoromethyl group on the spectral properties of the mols. of compounds dissolved in organic solvents of different nature and their resistance to thermal oxidative degradation

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Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about Molecular Rectangle Formed by Head-to-tail Self-Assembly of 1-(Dipyrrin-2-yl)-1′-(dipyrrin-3-yl)methane.Name: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate.

1-(Dipyrrin-2-yl)-1′-(dipyrrin-3-yl)methane (I), the N-confused analog of biladiene-ac, was prepared by condensation of 2,3′-dipyrromethane with two mols. of 2-formylpyrrole in CH2Cl2 in the presence of HBr. Self-assembly of the ligand with Zn(II) in CH2Cl2 and MeOH offers a dinuclear dimeric complex with a ligand:metal ratio of 2:2. X-ray crystal structure anal. reveals two ligands bound through a head-to-tail pattern to two Zn centers to form a severely distorted helical conformation, which has the shape of a rectangle.

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Herberhold, Max; Ellinger, Max; Kremnitz, Walter published the article 《Ferrocenylamines》. Keywords: ferrocenylamine; amine ferrocenyl.They researched the compound: Bromoferrocene( cas:1273-73-0 ).Safety of Bromoferrocene. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:1273-73-0) here.

A general method for the preparation of ferrocenylamines involves the reactions of ferrocenyl bromide, FcBr, with the Na salt of an amine or amide in the presence of copper(I) bromide/pyridine. The syntheses of diferrocenylphenylamine and triferrocenylamine, NFc2Ph and NFc3, resp., are reported, and the hydrolysis of N-ferrocenylacetamide to give ferrocenylamine, NH2Fc, is described. The system of the ferrocenyl- and/or phenyl-substituted derivatives of ammonia, NFcnX3-n (n = 0-3; X = H, Ph), is characterized on the basis of mass, UV, visible, and 1H and 13C NMR spectra.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis and protonation studies of a meso-unsubstituted surfactant porphyrin》. Authors are Ringuet, Michel; Gagnon, Jacques.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).Category: thiazolidine. Through the article, more information about this compound (cas:2199-44-2) is conveyed.

The surfactant porphyrin I was prepared Spectroscopic studies show that intermol. protonation occurs between the side-chain carboxyl groups and the inner N atoms of I, giving a porphyrin dication. In 5 × 10-5M CHCl3 solution, 27% of the porphyrin mols. are in the dicationic form and they are self-associated with some of the remaining mols. in the free base form.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《A novel route to certain 2-pyrrolecarboxylic esters and nitriles》. Authors are Kleinspehn, Geo. G..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).Reference of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. Through the article, more information about this compound (cas:2199-44-2) is conveyed.

HON:C(CO2Et)2 (I) underwent reduction and condensation with certain β-diketones and a β-oxo aldehyde to give 2-pyrrolecarboxylic esters. Similarly, HON:C(CN)CO2Et (II) and certain β-diketones afforded 2-pyrrolecarbonitriles. The method has been applied to the synthesis of 5 previously known pyrroles. This synthetic approach constitutes the most direct route to 4 of these 5 pyrroles. A sixth and previously unreported pyrrole, 3,5-dimethyl-2-pyrrolecarbonitrile (III), also has been prepared by this method. Ac2CH2 (5.00 g.) in 26 cc. glacial AcOH heated with vigorous stirring at 80° with 13 g. NaOAc and 11 g. Zn dust, the mixture then treated with 9.47 g. I in 12 cc. AcOH and 5 cc. H2O dropwise at 95-105° during 30-40 min., heated 20 min. at 100-5°, poured with stirring into 170 cc. ice water, and refrigerated, the precipitate washed with H2O, pressed dry, dissolved in 50 cc. boiling EtOH, and filtered hot, the filtrate concentrated to 30 cc., poured into 85 cc. ice water, and refrigerated, and the crystalline deposit dried in vacuo (5.03 g.), and recrystallized twice from 95% EtOH yielded 2-carbethoxy-3,5-dimethylpyrrole (IV), m. 124-4.5°. I and Ac2CHEt (50 millimole each), b23-3.5 79-83.5°, gave by the same procedure 6.36 g. 4-Et derivative of IV, m. 90-1° (from 95% EtOH). I and Ac2CH(CH2)2CO2H (50 millimoles) treated in the same manner, the reaction mixture treated with 5 cc. concentrated HCl, and the crude product (7.08 g.) recrystallized from boiling C6H6 gave 5-carbethoxy-2,4-dimethyl-3-pyrrolepropionic acid, m. 154-6°. NaOAc (7.9 g.) added with stirring to 29 cc. glacial AcOH at 85°, the mixture treated with 7.00 g. AcCHMeCHO, 9.48 g. I, and 12 cc. glacial AcOH in 5 cc. H2O, followed by 11 g. Zn dust at 95-105°, stirred 20 min., poured into 170 cc. ice water, and refrigerated, and the deposit dissolved in 10 cc. boiling EtOH and filtered, the filtrate poured into 20 cc. ice water, and the precipitate (2.49 g.) recrystallized from 95% EtOH and then twice from isoöctane gave 2-carbethoxy-3,4-dimethylpyrrole (V), m. 75-6.5°. V heated briefly in EtOH with excess 40% aqueous CH2O and a few drops concentrated HCl yielded 5,5′-methylenebis(2-carbethoxy-3,4-dimethylpyrrole), m. 202-3°. II and Ac2CH2 (50 millimoles each) treated by the usual procedure, the crude product containing the Zn dust dissolved in 25 cc. boiling 95% EtOH, and the filtrate poured into 75 cc. ice water yielded 2.48 g. IV, m. 24-5° (recrystallized from EtOH and sublimed). Glacial AcOH (26 cc.) and 5.00 g. Ac2CH2 heated to 80°, the mixture treated consecutively with 13 g. NaOAc, 7.11 g. II, and 12 cc. AcOH in 5 cc. H2O, heated to 95°, treated during 20-5 min. with 11 g. Zn dust at 95-105°, stirred 20 min., and poured into ice water, the precipitate refrigerated, filtered off, dissolved in 15 cc. boiling EtOH, and filtered, the filtrate stirred into 30 cc. ice water and refrigerated, and the crude precipitate (2.10 g.) recrystallized twice from isoöctane yielded III, m. 75-6.5°. II and Ac2CHEt gave similarly 45% crude 4-Et derivative of III, m. 135-6°.

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Paine, John B. III; Dolphin, David published an article about the compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate( cas:2199-44-2,SMILESS:O=C(C1=C(C)C=C(C)N1)OCC ).Safety of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. 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:2199-44-2) through the article.

Pyrrole-2-carboxylates I (R = Me, Et; R1 = H, Me, Et, Pr, CH2CO2Me, CH2CH2CO2Me; R2 = Me, Et, Pr, CH2CH2CO2Et), versatile precursors for the total synthesis of both synthetic model and naturally occurring tetrapyrroles and porphyrins, were prepared in greatly improved yields by the addition of RCOCHR1COR2 and H2NCH(CO2)Et)2 to AcOH. The method is suitable for both small- and large-scale synthesis and has proved far more reliable than the in situ Zn reduction of HON:C(CO2Et)2. Yields range from 60-70% for the dominant product isomer from unsym. diketones to 75-90% for the single product derived from sym. diketones. RCOCHR1COR2 were prepared by treating RCOCHR1 with (R2CO)2O in the presence of BF3.

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