Category: 2199-44-2

Groves, Brandon R.; Smithen, Deborah A.; Cameron, T. Stanley; Thompson, Alison published the article 《Thionation reactions of 2-pyrrole carboxylates》. Keywords: pyrrolyl thionoester preparation; pyrrole carboxylate thionation Lawesson reagent.They researched the compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate( cas:2199-44-2 ).Computed Properties of C9H13NO2. 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:2199-44-2) here.

The reaction of 2-pyrrole carboxylates I [R = H, CH3; R1 = CH3, (CH2)4CH3, C6H5, etc.; R2 = CH3, CH2CH3, (CH2)2CH3; R3 = CH2CH3, C6H5CH2; X = O] with Lawesson’s reagent at elevated temperatures results in the corresponding thionoesters, I [X = S] concurrent with the production of a new class of pyrrole annulated with the (1,3,2)-thiazaphospholidine unit II. Addition of BF3·OEt2 to the thionation procedure was found to produce the corresponding F-BODIPY, III constituting a four-step reaction in one-pot. The scope and limitations of these reactions involving the promiscuous Lawesson’s reagent were described.

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Product Details 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 Synthesis of cyanopyrroles. Author is Cheng, Ling Jiang; Lightner, David A..

Regioselective synthesis of α-cyanopyrroles (vs. α-alkoxycarbonylpyrroles) using oximinocyanoacetate esters in a Knorr-type reductive condensation with β-diketones can be directed by the presence of water. Thus, HON:C(CN)CO2Me was reacted with CH2Ac2 in hot AcOH in the presence of Zn dust to give exclusively 3,5-dimethylpyrrole-2-carbonitrile when the AcOH was wet. Whereas, in glacial AcOH, only Me 3,5-dimethylpyrrole-2-carboxylate was isolated in ∼40% yield.

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Quality Control of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. 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 Pyrrole chemistry. An improved synthesis of ethyl pyrrole-2-carboxylate esters from diethyl aminomalonate. Author is Paine, John B. III; Dolphin, David.

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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Electric Literature of C9H13NO2. 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 Protonated Nitrogen Structure in 15N-Labeled Model Coal Investigated by Solid-State 1H-15N Double-CP NMR Experiments under Ultrafast Magic-Angle Spinning. Author is Okushita, Keiko; Hata, Yuki; Sugimoto, Yoshikazu; Takahashi, Takafumi; Kanehashi, Koji.

The nitrogen structure in coals has been focused on as a key factor for reducing NOx. Solid-state NMR (NMR) with high spectral resolution can be an effective tool for analyzing the nitrogen structure of coals once higher sensitivity is achieved in the future. To investigate the nitrogen structure in coals and coal-related mols., we acquired quant. 15N magic-angle spinning (MAS) NMR spectra of 15N-labeled synthesized coals produced from three different types of 15N-reagents. There were some variations in the relative peak intensity ratios of 15N MAS NMR spectra of the three model coals; in particular, the 15N-uracil-origin model coal showed a remarkable difference. Then, we elucidated the chem. environment around the 15N nuclei in the synthesized 15N-labeled coals using 1H-15N double cross-polarization techniques under the ultrafast MAS condition. From the 2D NMR results, it was clarified that there exist not only pyrrolic nitrogen groups but also amide-type nitrogen functional groups in the 1H-15N bonded region of the model coal with a sub-bituminous-level degree of carbonization.

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Dudina, N. A.; Antina, E. V.; Guseva, G. B.; V’yugin, A. I.; Semeikin, A. S. published the article 《New fluorescent chemosensor for Zn2+ ions on the basis of 3,3′-bis(dipyrrolylmethene)》. Keywords: fluorescent chemosensor zinc ion dipyrrolylmethene.They researched the compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate( cas:2199-44-2 ).Reference of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate. 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:2199-44-2) here.

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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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.Name: 2-Bromo-6-methylphenol. The article 《Synthesis of a tripyrrin-14-carboxylic acid with two neopentyl groups》 in relation to this compound, is published in Chemische Berichte. Let’s take a look at the latest research on this compound (cas:2199-44-2).

Tripyrrincarboxylic acid I was prepared from pyrrole II by condensation with Me3CCHO and HI to give iodo derivative III which was reduced to IV. SO2Cl2 reacted with IV to give V, which was hydrolyzed to aldehydic acid VI. This condensed with 3,4-dimethyl-3-pyrrolin-2-one to pyrromethenone VII, which was decarboxylated to VIII. VI condensed with VIII to give I. Metal complexes of I are soluble in most organic solvents even after crystallization

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Nitropyrroles. III. Ultraviolet absorption spectra and tautomeric transformations of some nitropyrroles》. Authors are Novikov, S. S.; Belikov, V. M.; Egorov, Yu. P.; Safonova, E. N.; Semenov, L. V..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).Formula: C9H13NO2. Through the article, more information about this compound (cas:2199-44-2) is conveyed.

cf. ibid. 1307. Examination of the ultraviolet absorption spectra of some nitropyrroles showed the possibility of identification of these substances and confirmed the structure of 1-methyl-3,4-dinitropyrrole. Acidity of N-unsubstituted pyrrole with nitro groups in the ring increases with increasing number of NO2 groups and with transfer of NO2 group from 3- to 2-position, probably owing to the inductive effect of the group on the NH bond. This phenomenon is discussed in connection with tautomerism of nitropyrroles. The following absolute maximum are reported: pyrrole 210 and 240 mμ; 3-methyl-4-ethylpyrrole 200; 2-ethoxycarbonyl-3,5-dimethylpyrrole 240 and 276; 3-ethoxycarbonyl-2,4-dimethylpyrrole 232 and 259; 2-acetyl-3,5-dimethyl-4-ethylpyrrole 266 and 308; 2,4-dimethyl-3-acetylpyrrole 251 and 280. Spectra of nitropyrroles are shown at various pH values. In basic media these show a maximum at about 400 mμ.

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HPLC of Formula: 2199-44-2. 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 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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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 tert-Butylpyrroles, Author is Treibs, Alfred; Schulze, Lothar, the main research direction is butyldimethyl pyrrole; pyrrole butyldimethyl.Name: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate.

Reaction of 3-(R-substituted)-2,4-dimethylpyrroles (R = CO2Et or Ac) with tert-BuOAc in the presence of strong acids, e.g. H2SO4, HClO4, or HI gave 12-30% corresponding 5-tert-butyl compounds (I). Treatment of I (R = CO2Et) with H3PO4 gave 43% I (R = H). Similar reactions were performed with 5-(ethoxycarbonyl)-2,4-dimethylpyrrole.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about Photophysical properties of a C6 hydrocarbon-linked porphyrin dimer, the main research direction is hexamethylenebisporphyrin preparation fluorescence; zinc hexamethylenebisporphyrin preparation fluorescence; conformation hexamethylenebisporphyrin solution; porphyrin hexamethylenebis preparation fluorescence.Computed Properties of C9H13NO2.

The porphyrin dimer I and its Zn complex were prepared Fluorescence quantum yields and excited singlet and triplet state lifetimes, recorded for the dimers and the corresponding monomer species, suggest that the dimeric porphyrins exist in solution in both open and closed conformations. The open conformations retain photophys. properties similar to those of the monomerics but the closed conformations do not fluoresce.

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