Month: March 2022

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate(SMILESS: O=C(C1=C(C)C=C(C)N1)OCC,cas:2199-44-2) is researched.HPLC of Formula: 25956-17-6. The article 《Acetylene condensation in a series of pyrroles》 in relation to this compound, is published in Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya. Let’s take a look at the latest research on this compound (cas:2199-44-2).

Condensation of Et 4-iodo-3,5-dimethylpyrrole-2-carboxylate with HCCR(R = Ph, morpholinomethyl) in Et2NH in the presence of Pd (PPh3)2Cl2 and CuI gave ethynylpyrroles I in 64 and 68% yield, resp. Similar reaction with HOCMe2CCH gave the deiodinated product in 18% yield. Treatment of II (R = I) with CuCCPh in pyridine-DMF at reflux gave 78.0% II (R = CCPh). Deiodination of III (R = I) (IV) was easier than with the 4-iodo-2-carboxylate derivative but more difficult than II (R = I). In the presence of Pd complex catalyst condensation of IV and PhCCH gave concurrent redn and substitution.

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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 Synthesis and some reactions of pyrroles with aliphatic acyl substituents.Formula: C9H13NO2.

4-Acylpyrrolecarboxylates (I; R = EtCO, C15H31CO, C17H35CO) were prepared in about quant. yields of Friedel-Crafts acylation of I (R = H). Reduction of I by NaBH4 gave 82-97% of alc. (II; R = Et, C15H31, R1 = H). Heating II (R = C15H31, R1 = H) in pyridine with Ac2O gave 96% acryl derivative II (R = C15H31, R1 = Ac). Treatment of I (R = C17H35CO) with Pb(OAc)4 gave an acylated intermediate which with 40% HBr and MeOH gave 85% pyrrole (III; R = C17H35CO, R1 = MeO). Similarly III (R = C15H31CO, R1 = Cl) was obtained in 75% yield.

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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Catalytic Hydrogenation of Substituted Quinolines on Co-Graphene Composites, published in 2021-12-21, which mentions a compound: 114527-53-6, Name is 1,2,3,4-Tetrahydroquinoline-3-carboxylic acid, Molecular C10H11NO2, Formula: C10H11NO2.

A set of 20 composites was prepared by pyrolysis of Co2+ complexes with 1,10-phenanthroline, melamine and 1,2-diaminobenzene. These composites were tested as the catalysts for the hydrogenation of quinolines. As shown by powder X-ray diffraction and TEM, the composites contained Co particles of several dozen nm sizes. The composition (elements content), Raman spectra X-ray photoelectron spectra parameters of the composites were analyzed. It was found that there was no distinct factor that controlled the yield of 1,2,3,4-tetrahydroquinolines in the investigated process. The yields of the resp. products were in the range 90-100%. The three most active composites were selected for scale-up and hydrogenation of a series of substituted quinolines. Up to 97% yield of 1,2,3,4-tetrahydroquinoline was obtained on a 50 g scale. Five representative substituted quinolines were synthesized on a 10-20 g scale using the Co-containing composites as the catalysts.

Here is a brief introduction to this compound(114527-53-6)Formula: C10H11NO2, if you want to know about other compounds related to this compound(114527-53-6), you can read my other articles.

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Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 2199-44-2, is researched, SMILESS is O=C(C1=C(C)C=C(C)N1)OCC, Molecular C9H13NO2Journal, Russian Journal of General Chemistry called 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., the main research direction is bistetramethyl ethyldipyrrolylmethenyl acetylene dihydrobromide preparation; quantum chem simulation conformation spectral.Category: thiazolidine.

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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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《A modified Knorr pyrrole synthesis》. Authors are MacDonald, S. F.; Stedman, R. J..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).Computed Properties of C9H13NO2. Through the article, more information about this compound (cas:2199-44-2) is conveyed.

Isonitrosoacetoacetic ester reacts with p-AcCH2SO2C6H4Me, under the conditions of the Knorr pyrrole synthesis, to yield 4% 2,4-dimethyl-3-(p-toluenesulfonyl)-5-carbethoxypyrrole (I), m. 185-6°. When I is refluxed 4 hrs. with W-6 catalyst in absolute EtOH, 2,4-dimethyl-5-carbethoxypyrrole, m. 123-4°, is formed.

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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 Direct C-C-coupling of ferrocenyl- and cymantrenyllithium with 5-(het)aryl-1,2,5-oxadiazolo[3,4-b]pyrazines, published in 2011, which mentions a compound: 1273-73-0, mainly applied to crystal structure mol oxadiazolopyrazinyl ferrocene cymantrene preparation, SDS of cas: 1273-73-0.

A direct C-C-coupling of ferrocenyl- and cymantrenyllithium with 5-(het)aryl-1,2,5- oxadiazolo[3,4-b]pyrazines was accomplished. Main characteristics of the SNH-reaction products were obtained, as well as crystallog. data on the spatial structure of oxadiazolopyrazinylferrocenes and -cymantrenes synthesized.

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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Derivatives of pyrrylazobenzenearsonic acids, published in 1950, which mentions a compound: 2199-44-2, Name is Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, Molecular C9H13NO2, Computed Properties of C9H13NO2.

cf. C.A. 45, 9526a. The synthesis is essentially the same as previously described. 2,4-Dimethyl-3,5-carbethoxypyrrole (I) was prepared by the method of Knorr. I was saponified in 10% KOEt, and converted to 2,4-dimethyl-3-carbethoxy-5-pyrrolecarboxylic acid (II) by the method of Küster, et al. (C.A. 16, 3895). Decarboxylation of II by dry distillation gave 2,4-dimethyl-3-carbethoxypyrrole (III). I was also treated with concentrated H2SO4 by the method of Fischer and Walach (C.A. 20, 1620) to give 2,4-dimethyl-5-carbethoxy-3-pyrrolecarboxylic acid, which was decarboxylated by heating at atm. pressure to 2,4-dimethyl-5-carbethoxypyrrole (IV). Attempts to couple diazotized 4, 3-H2N(O2N)C6H3AsO3H2 and III were not successful; a resinous product, which could not be purified, was obtained, and III was isolated from the reaction mixture Attempts to couple a salt of diazotized 3,4-H2N(HO)C6H3AsO3H2 (V) with IV were also unsuccessful. p-H2NC6H4AsO3H2 (4.34 g.) in 50 cc. H2O containing 1.63 cc. concentrated H2SO4 was diazotized with 20 cc. N NaNO2 at 0-5° and the product filtered into 3.34 g. III in 200 cc. absolute EtOH. 4-(3-Carbethoxy-2,4-dimethyl-5-pyrrylazo)benzenearsonic acid (VI) precipitated as an orange-yellow powder. VI was filtered, rinsed with water, dissolved in aqueous NaOH, and the solution clarified with active C; acidification with dilute HCl gave 4.3 g. VI, orange-yellow microcrystals, decompose 210°, slightly soluble in water, somewhat more soluble in EtOH, nearly insoluble in C6H6 and ether, and soluble in dioxane; crystallization from dioxane gave well-formed needles. VI was precipitated from alk. solution with dilute acids. VI was stable in air under light. V (4.66 g.) in 70 cc. H2O containing 5.8 cc. concentrated H2SO4 was diazotized as above and the product filtered into 3.34 g. III in 200 cc. absolute EtOH. 2-(3-Carbethoxy-2,4-dimethyl-5-pyrrylazo)-1-phenol-4-arsonic acid (VII) precipitated, and addnl. amounts of VII were obtained on diluting with H2O. VII was then dissolved in N NaOH, the solution clarified with active C, added to 0.1 N HCl with constant stirring, and the precipitate was filtered, washed with H2O, dried, and recrystallized twice from dioxane to yield 7.2 g. VII, yellow needles, decompose 160°. VII was stable in air under light. (p-H2NC6H4)2As(:O)OH (1.46 g.) in 30 cc. H2O containing 3.7 cc. concentrated HCl was diazotized as above with 10 cc. N NaNO2 and the solution added dropwise at 5° or lower to 1.67 g. III in 70 cc. EtOH containing 5 g. NaOAc, previously dissolved in a small volume of H2O, to yield di-Et 5, 5′-[arsinobis(p-phenyleneazo)]bis[2,4-dimethyl-3-pyrrolecarboxylate] (VIII). VIII was filtered, washed with cold H2O, dried in vacuo, and recrystallized from dioxane and then from ether to yield 1 g. VIII, dark orange microcrystals, m. 151° (decomposition). VIII was soluble in EtOH, dioxane, and CHCl3. p-H2NC6H4AsO3H2 (2.17 g.) in 25 cc. H2O containing 0.81 cc. concentrated H2SO4 was diazotized with 10 cc. N NaNO2 and the product filtered into 1.67 g. IV in 200 cc. absolute EtOH; when the solution was clear 15 g. NaOAc in a small amount of H2O was added with cooling, and, after 1 hr., 4 l. H2O was added to precipitate 4-(5-carbethoxy-2,4-dimethyl-3-pyrrylazo)benzenearsonic acid (IX), yellow-orange powder. IX was twice dissolved in alkali and reprecipitated by dilute HCl, washed with water, and dried in vacuo to yield 1.2 g. IX, darkens 100°, m. 185° (decomposition), IX was soluble in EtOH and dioxane, and stable in air under light.

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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: 1273-73-0, is researched, Molecular C10BrFe, about 1-(1′-Bromoferrocenyl)silver, the main research direction is bismuth estimation; bismuth ferrocene compound; silver ferrocene compound; silver ferrocene compound; ferrocenes; iron organic compound.Formula: C10BrFe.

Treating 0.5 g 1-bromo-1′-ferroceneboronic acid with Ag2O from 0.5 g Ag NO3 in NH4OH and heating briefly gave 53% 1-(1′-bromoferrocenyl)-silver, decomposed 125-6°. This with concentrated HCl 10 min gave 70% bromoferrocene, while pyrolysis in xylene gave a Ag mirror and 60% bis(1′-bromoferrocenyl), m. 138-40°. Treated with HgBr2 in C6H6 the Ag salt gave 80% 1-(1′-bromoferrocenyl)-mercuric bromide, m. 143-5°. The Ag derivative and BiBr3 in C6H6 in 3-4 hrs gave bromoferrocene and 50% tris(1′-bromoferrocenyl)bismuth, m. 179.5-81°. This kept in concentrated HCl 0.5 hr, then treated with aqueous NH4OH to neutrality, then percolated with H2S, gave a precipitate which was used for estimation of Bi after washing and drying to constant weight

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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: Bromoferrocene, is researched, Molecular C10BrFe, CAS is 1273-73-0, about Synthesis, chemical reactivity and electrochemical behaviour of mono- and difluoro metallocenes.Related Products of 1273-73-0.

Syntheses of mono- and 1,1′-difluoro-substituted metallocenes (ferrocene, ruthenocene) and of asym. 1,1′-disubstituted ferrocenes with one substituent being fluorine are described. Lithiation of metallocenes and subsequent addition of the fluorinating agent NFSI gave the fluorinated metallocenes after optimization of the exptl. conditions. All new compounds were comprehensively characterized and the cyclic voltammograms of fluoro- and 1,1′-difluoroferrocene were recorded and compared to other mono- and dihalogenated ferrocenes. Half-wave potentials of +106 mV and +220 mV vs. FcH0/+ were obtained for monofluorinated species and difluorinated ferrocene, resp. Both values are remarkably low compared to the other halogenated ferrocenes (Cl, Br, and I). Finally, 1-bromo-1′-fluoro-ferrocene turns out to be an ideal starting material for further fluoro-substituted ferrocene derivatives

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Computed Properties of C13H15F3N2O. 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. Compound: (R)-4-(tert-Butyl)-2-(5-(trifluoromethyl)pyridin-2-yl)-4,5-dihydrooxazole, is researched, Molecular C13H15F3N2O, CAS is 1428537-19-2, about Enantioselective construction of remote quaternary stereocentres.

Small mols. that contain all-carbon quaternary stereocenters-carbon atoms bonded to four distinct carbon substituents-are found in many secondary metabolites and some pharmaceutical agents. The construction of such compounds in an enantioselective fashion remains a long-standing challenge to synthetic organic chemists. In particular, methods for synthesizing quaternary stereocenters that are remote from other functional groups are underdeveloped. Here we report a catalytic and enantioselective intermol. Heck-type reaction of trisubstituted-alkenyl alcs. with aryl boronic acids. This method provides direct access to quaternary all-carbon-substituted β-, γ-, δ-, ε- or ζ-aryl carbonyl compounds, because the unsaturation of the alkene is relayed to the alc., resulting in the formation of a carbonyl group. The scope of the process also includes incorporation of pre-existing stereocenters along the alkyl chain, which links the alkene and the alc., in which the stereocenter is preserved. The method described allows access to diverse mol. building blocks containing an enantiomerically enriched quaternary center.

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