Month: April 2022

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, Justus Liebigs Annalen der Chemie called Dithiocarboxylic acids of pyrroles. II. Friedel-Crafts reactions with carbon disulfide, Author is Treibs, Alfred; Friess, Raimund, the main research direction is pyrrole dithiocarboxylic acid preparation; dithiocarboxylic acid pyrrole preparation; Friedel Crafts reaction carbon disulfide; carbon disulfide Friedel Crafts reaction.Application In Synthesis of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate.

Reaction of 2,4-dimethyl-5-(ethoxycarbonyl)pyrrole (I) with AlCl3 in CS2 gave 10% 3-(dithiocarboxy) derivative (II) of I. The same reactions in the presence of ClCO2Et gave the Et ester of II. 2-Methyl-3-(ethoxycarbonyl)pyrrole-5-dithiocarboxylic acid was obtained in 10% yield from 2-methyl-3-(ethoxycarbonyl)pyrrole with AlCl3 and CS2. These reactions show CS2 was not an indifferent solvent in Friedel-Crafts reactions.

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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: 1428537-19-2, is researched, Molecular C13H15F3N2O, about C3-Arylation of indoles with aryl ketones via C-C/C-H activations, the main research direction is arylindole preparation regioselective; indole aryl ketone arylation palladium catalyst carbon hydrogen activation.Category: thiazolidine.

C3-Arylation of indoles with aryl ketones is accomplished via palladium-catalyzed ligand-promoted Ar-C(O) cleavage and subsequent C-H arylation of indole. Various (hetero)aryl ketones are compatible in this reaction, affording the corresponding 3-arylindoles in moderate to good yields. Further introduction of an indole moiety into the natural products desoxyestrone and evodiamine demonstrate the synthetic utility of this protocol.

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Safety of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. 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: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about Chemistry of pyrrole pigments. III. Nitrogen-hydrogen tautomerism of substituted pyrromethenes. Proton nuclear magnetic resonance spectrometric investigations. Author is Falk, H.; Gergely, S.; Hofer, O..

The temperature-, solvent-, and concentration-dependence of the NMR of the pyrromethenes(I thru VI) was examined and the chem. shifts were assigned and the long range coupling constants were determined Intra- and intermol. proton transfer was observed; tautomeric NH exchanges at -100° were too fast to be measured by NMR.

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Reference:
Thiazolidine – Wikipedia,
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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 Electronic effects in the ferrocene ring system by proton magnetic resonance spectroscopy. Author is Slocum, D. W.; Engelmann, T. R.; Lewis, Robert; Kurland, R. J..

Results of a proton magnetic resonance study of the chem. shifts of ring protons of representative monosubstituted ferrocene compounds are reported. The substituents cover a span from strongly electron-donating groups to strongly electron-withdrawing. Some relations appear to exist between the ring-proton chem. shifts in these compounds and those reported for the corresponding monosubstituted benzene compounds The chem. shifts recorded were precisely measured. As such, they serve to revise the data reported while this work was in progress. 15 references.

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Thiazolidine – Wikipedia,
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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: 1273-73-0, is researched, SMILESS is Br[C-]12[Fe+2]3456789([C-]%10C6=C7C8=C9%10)C1=C3C4=C25, Molecular C10BrFeJournal, Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya called Ferrocenylgold-triphenylphosphine, Author is Nesmeyanov, A. N.; Perevalova, E. G.; Lemenovskii, D. A.; Kosina, A. N.; Grandberg, K. I., the main research direction is gold ferrocenyl phosphines; ferrocenyl phosphines gold; phosphines gold ferrocenyl; ferrocenes; iron organic compound.Name: Bromoferrocene.

To ferrocenyllithium from 2.8 g ferrocene in THF-Et2O with BuLi under argon was added 2 g ClAuPPh3, and after 2 hr the mixture quenched in H2O to yield 81% orange ferrocenyl-goldtriphenylphosphine, C5H5FeC5H4AuPPh3, decomposed 150°; ir and NMR spectral data given. Chromatog. on Al2O3 decomposed this to ferrocene. BrAuPPh3 in the above reaction gave the same complex in 67% yield. Treated with dry HCl in C6H6 the product gave ferrocene and ClAuPPh3, m. 242-3°; HI gave diferrocenyl in trace amounts along with nearly 100% ferrocene and IAuPPh3, m. 224-5°. HCN similarly converted the complex into ferrocene and AuCN.PPh3, m. 203.5-204°. Bromination gave bromoferrocene, m. 30-1°, and 81% BrAuPPh3. ClAuPPh3 in Et2O under argon treated with BuLi 5 hr gave 86% oily BuAuPPh3, which darkened in air. It was purified by freezing in liquid pentane at -70°.

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Reference:
Thiazolidine – Wikipedia,
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COA of Formula: C13H15F3N2O. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. 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 N-Alkylation of Indoles via an Intermolecular Aza-Wacker-Type Reaction. Author is Allen, Jamie R.; Bahamonde, Ana; Furukawa, Yukino; Sigman, Matthew S..

In the presence of Pd(MeCN)2(OTs)2 and a nonracemic pyridinyloxazoline, 3-substituted indoles such as 3-phenylindole underwent intermol., chemoselective, and enantioselective alkylation/aza-Wacker reactions with cis-allylic and cis-homoallylic alcs. such as (Z)-EtCH:CHCH2OH mediated by p-benzoquinone in 1,2-dichloroethane to yield nonracemic β- and γ-(1-indolyl)alkanals such as I; enamines generated under other conditions were not formed. The mechanism was studied using the reaction of a deuterium-labeled allylic alc.; the stereochem. of the product supported a syn amino-palladation mechanism for the reaction.

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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).Quality Control of 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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Electric Literature of C7H4ClN3O2. 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: 2-Chloro-7-nitro-1H-benzo[d]imidazole, is researched, Molecular C7H4ClN3O2, CAS is 15965-55-6, about Benzimidazoles. II. Effect of benzene nucleus substituents on the nuclopphilic reactivity of some 2-chloro-benzimidazoles. Author is Ricci, Alfredo; Vivarelli, Piero.

cf. CA 67: 64300p. An equimol. mixture of 4,2-R(H2N)C6H3NH2.2HCl, or 3,2-R(H2N)C6H3NH2.2HCl and urea, heated 20 min. at 160-80°, the reaction mixture extracted with hot 10% NaOH and the alk. solution acidified with HCl, precipitated known 5(6)-substituted- or 4(7)-substituted-2-benzimidazolones, resp., which (0.01 mole) with 0.07 mole POCl3 and a few drops of concentrated HCl, heated 3-4 hrs. at 160-70° in a sealed tube yielded the following I (R, m.p., and % yield given): 5(6)-NO2, 222-3°, -; 5(6)-Cl, 207-8°, 70; 5(6)-Me, 185-6°, 72; 5(6)-MeO, 170-1°, 40; 4(7)-NO2, 196-7°, 40; 4(7)-Cl, 187-8°, 70; 4(7)-Me, 141-2°, 50; 4(7)-MeO, 151-2°, 55. Kinetic studies on the nucleophilic reactivity of I, carried out with piperidine at 100°, indicated that the 2-Cl mobility increases when R is electron-withdrawing, and decreases when R is electron donor. A linear correlation was also found for the effect of the substituents on the reaction center with σmeta + σpara for the position 5(6) and σortho + σmeta for the 4(7)-position, resp.

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Thiazolidine – Wikipedia,
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Category: thiazolidine. 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 Oxidation kinetics of ferrocene derivatives with dibenzoyl peroxide. Author is Halstead, Joshua M.; Abu-Saleh, Refaat; Schildcrout, Steven M.; Masnovi, John.

Chem. oxidation of ferrocene and related derivatives by dibenzoyl peroxide in acetonitrile solution produces ferrocenium and benzoic acid after acidification. The rate law is first order in oxidant and in reductant. Steric effects and activation parameters are consistent with a rate-controlling outer-sphere single-electron transfer (ET) step, and reorganization energies are obtained using Marcus theory with B3LYP calculations Energetics, optimized structures, and solvent effects indicate that rate is affected more by anion than cation solvation and that oxidation of decamethylferrocene by 3-chloroperoxybenzoic acid does not occur by ET.

In some applications, this compound(1273-73-0)Category: thiazolidine is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.

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Thiazolidine – Wikipedia,
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Safety of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. 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: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about Structure-Activity Relationships of (4-Acylpyrrol-2-yl)alkanoic Acids as Inhibitors of the Cytosolic Phospholipase A2: Variation of the Substituents in Positions 1, 3, and 5. Author is Lehr, Matthias.

Derivatives of 3-(1,3,5-trimethyl-4-octadecanoylpyrrol-2-yl)propionic acid (1) and (1,3,5-trimethyl-4-octadecanoylpyrrol-2-yl)acetic acid (4) were prepared and evaluated for their ability to inhibit the cytosolic phospholipase A2 of intact bovine platelets. While replacement of one of the Me groups in position 1, 3, or 5 of the acetic acid 4 by a benzyl residue did not influence the inhibitory potency significantly, the introduction of a dodecyl chain led to compounds which even enhanced the enzymic activity. Stepwise elongation of the alkyl substituent in position 1 showed that the ability to inhibit the enzyme was lost when the alkyl chain exceeded a length of five carbons in case of compound 1 or six carbons in case of compound 4. Introduction of a polar functional group at the end of the 1-alkyl chain of these inactive pyrroles, however, restored or even elevated inhibitory potency. The most preferable of the polar terminal functions investigated was the carboxylic acid moiety. 6-[2-(2-Carboxyethyl)-4-dodecanoyl-3,5-dimethylpyrrol-1-yl]hexanoic acid (65c) and 6-[2-(carboxymethyl)-4-dodecanoyl-3,5-dimethylpyrrol-1-yl]nonanoic acid (66f) were to the synthesized inhibitors with the greatest potency. With IC50 values of 3.4 and 3.3 μM, resp., they were about 3-fold more active than the standard cPLA2 inhibitor arachidonyl trifluoromethyl ketone (IC50: 11 μM).

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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com