Category: 67-51-6

An article Complexes of palladium(II) chloride with 3-(pyrazol-1-yl)propanamide (PPA) and related ligands WOS:000491625700057 published article about METAL-ORGANIC FRAMEWORKS; N-PYRAZOLYLPROPANAMIDE; CRYSTAL-STRUCTURE; CONSTRUCTION in [Palombo, Tyler M.; Hildebrand, Sara J.; Patrikus, Quentin R.; Assarsson, Anders P.; Amenta, Donna S.; Gilje, John W.] James Madison Univ, Dept Chem & Biochem, MSC 4501, Harrisonburg, VA 22807 USA; [Liebing, Phil; Wang, Ling; Engelhardt, Felix; Edelmann, Frank T.] Otto von Guericke Univ, Chem Inst, Univ Pl 2, D-39106 Magdeburg, Germany in 2019.0, Cited 25.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6. SDS of cas: 67-51-6

Four new derivatives of the versatile polyfunctional ligands 3-(pyrazol-1-yl)propanamide (1, = PPA) and 3-(3,5-dimethylpyrazol-1-yl)-propanamide (2, = Me(2)PPA) have been prepared, in which one of the amide hydrogens on 1 and 2 is formally replaced by alkyl residues. X-Ray diffraction studies revealed that, in contrast to 1 and 2, the N-isopropyl substituted derivatives 3 and 4 form supramolecular hydrogen-bonded chains rather than two-dimensional arrays, and the N-(2-methyl-4-oxypentan-2-yl) (=MOP) substituted compounds 5 and 6 exist as cyclic dimers in the solid state. Reactions of PdCl2(COD) (COD = 1,5-cyclooctadiene) with 2 equiv. of the corresponding ligands 1-6 in all cases afforded trans-PdCl2(L)(2) complexes (7-12). X-ray crystal structure determinations of 8, and 10-12 revealed kappa N-monodentate coordination of the PPA-type ligands. (C) 2019 Elsevier Ltd. All rights reserved.

About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Palombo, TM; Liebing, P; Hildebrand, SJ; Patrikus, QR; Assarsson, AP; Wang, L; Amenta, DS; Engelhardt, F; Edelmann, FT; Gilje, JW or concate me.. SDS of cas: 67-51-6

Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

I found the field of Chemistry very interesting. Saw the article A structural study of new tetrakis(1H-pyrazol-1-yl)methanes published in 2019.0. SDS of cas: 67-51-6, Reprint Addresses Alkorta, I (corresponding author), CSIC, Inst Quim Med, Juan Cierva 3, E-28006 Madrid, Spain.. The CAS is 67-51-6. Through research, I have a further understanding and discovery of 3,5-Dimethyl-1H-pyrazole

Tetrakis(1H-pyrazol-l-yl)methanes are very rare compounds of which only two are known: the unsubstituted 1 obtained classically by Wicket in 1937 from carbon tetrachloride and prepared again several times and the 3,5-dimethyl substituted 2 obtained serendipitously by Pombeiro in 2009. We have now extended this group to include four new derivatives 8, 9,11 and 12 bearing methyl groups. The X-ray crystal structure of the four compounds has been determined. They have been studied by NMR both in solution (H-1, C-13, N-15) and in the solid state (C-13 and N-15). DFT calculations of the six compounds (geometries, energies and absolute shieldings) have been used to discuss the experimental observations. (C) 2019 Elsevier Ltd. All rights reserved.

About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Silva, VLM; Silva, AMS; Claramunt, RM; Lopez, C; Sanz, D; Infantes, L; Lopez, AM; Reviriego, F; Alkorta, I; Elguero, J or concate me.. SDS of cas: 67-51-6

Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

I found the field of Chemistry very interesting. Saw the article Visible-Light Photoredox Catalyzed C-N Coupling of Quinoxaline-2(1H)-ones with Azoles without External Photosensitizer published in 2020.0. Recommanded Product: 67-51-6, Reprint Addresses Wang, L (corresponding author), Taizhou Univ, Adv Res Inst, Taizhou 318000, Zhejiang, Peoples R China.; Wang, L; Li, PH (corresponding author), Huaibei Normal Univ, Dept Chem, Huaibei 235000, Anhui, Peoples R China.; Wang, L; Li, PH (corresponding author), Shanghai Inst Organ Chem, State Key Lab Organometall Chem, Shanghai 200032, Peoples R China.. The CAS is 67-51-6. Through research, I have a further understanding and discovery of 3,5-Dimethyl-1H-pyrazole

A visible-light photoredox catalyzed C-N coupling of quinoxaline-2(1H)-ones with azoles in the absence of external photosensitizer has been developed. The protocol employs commercially available pyrazoles and triazoles as amination reagents and shows wide substrate scope, providing the corresponding C3-position amination products in good yields and high regioselectivity under ambient conditions. Investigations indicate that the starting materials and products can act as photosensitizers avoiding use of additional photocatalyst in an autocatalytic manner. In addition,(1)O(2)coexists with O(2)(.-)from molecular oxygen (O-3(2)) via an energy transfer (ET) and single electron transfer (SET) process during the reaction.

About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Sun, ML; Wang, L; Zhao, LL; Wang, ZM; Li, PH or concate me.. Recommanded Product: 67-51-6

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Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

An article Photocatalytic three-component asymmetric sulfonylation via direct C(sp(3))-H functionalization WOS:000642744500008 published article about C-H FUNCTIONALIZATION; STEREOSELECTIVE FUNCTIONALIZATION; SULFUR-DIOXIDE; ALKYLATION; CATALYST; ORGANOCATALYSIS; BORYLATION; ALLYLATION; INHIBITOR; ARYLATION in [Cao, Shi; Hong, Wei; Ye, Ziqi; Gong, Lei] Xiamen Univ, Coll Chem & Chem Engn, iChEM, Key Lab Chem Biol Fujian Prov, Xiamen, Fujian, Peoples R China in 2021.0, Cited 80.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6. Name: 3,5-Dimethyl-1H-pyrazole

The direct and selective C(sp(3))-H functionalization of cycloalkanes and alkanes is a highly useful process in organic synthesis owing to the low-cost starting materials, the high step and atom economy. Its application to asymmetric catalysis, however, has been scarcely explored. Herein, we disclose our effort toward this goal by incorporation of dual asymmetric photocatalysis by a chiral nickel catalyst and a commercially available organophotocatalyst with a radical relay strategy through sulfur dioxide insertion. Such design leads to the development of three-component asymmetric sulfonylation involving direct functionalization of cycloalkanes, alkanes, toluene derivatives or ethers. The photochemical reaction of a C(sp(3))-H precursor, a SO2 surrogate and a common alpha,beta-unsaturated carbonyl compound proceeds smoothly under mild conditions, delivering a wide range of biologically interesting alpha-C chiral sulfones with high regio- and enantioselectivity (>50 examples, up to >50:1 rr and 95% ee). This method is applicable to late-stage functionalization of bioactive molecules, and provides an appealing access to enantioenriched compounds starting from the abundant hydrocarbon compounds. The direct and selective C(sp(3))-H functionalization of cycloalkanes and alkanes is useful in organic synthesis but its application to asymmetric catalysis has been less explored. Here, the authors demonstrate the incorporation of a dual asymmetric photocatalyst which leads to the development of asymmetric sulfonylation involving direct functionalization of cycloalkanes, alkanes, toluene derivatives or ethers.

About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Cao, S; Hong, W; Ye, ZQ; Gong, L or concate me.. Name: 3,5-Dimethyl-1H-pyrazole

Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

An article Supramolecular association in Cu(II) and Co(II) coordination complexes of 3,5-dimethylpyrazole: Experimental and theoretical studies WOS:000447787500019 published article about METAL-ORGANIC FRAMEWORKS; X-RAY STRUCTURES; CRYSTAL-STRUCTURE; BONDING INTERACTIONS; CATALYTIC-ACTIVITIES; ALUMINUM TRIHALIDES; CHALCOGEN BOND; SOLID-STATE; TRIEL BONDS; LIGANDS in [Gogoi, Anshuman; Nashre-ul-Islam, Swah Mohd.; Bhattacharyya, Manjit K.] Cotton Univ, Dept Chem, Gauhati 781001, Assam, India; [Frontera, Antonio] Univ Illes Balears, Dept Quim, Crta Valldemossa Km 7-7, Palma De Mallorca 07122, Baleares, Spain in 2019.0, Cited 75.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6. COA of Formula: C5H8N2

Two coordination complexes of Cu(II) and Co(II) involving 3,5-dimethylpyrazole viz. { [Cu(mu-O,O’-SO4) (Hdmpz)(2)(H2O)]center dot 2H(2)O}(n) (1) and [Co(Hdmpz)(4)(H2O)(2)Cl-2 (2) (where Hdmpz = 3,5-dimethylpyrazole) have been synthesized in purely aqueous medium at room temperature. Crystal structure of complex 1 consists of a polymeric chain of distorted square pyramidal Cu(II) centers bridged by bidentate sulfato ligands. The polymeric chain in 1 has been stabilized by N-H center dot center dot center dot O and C-H center dot center dot center dot pi interactions. Particularly relevant is the polymeric chain in 1, since in addition to the afore mentioned non-covalent contacts, unprecedented chalcogen bonding interactions involving the sigma-hole at the tetrahedral sulfur atom are observed and characterized using theoretical calculations. To our knowledge, sigma-hole chalcogen bonding interactions involving tetrahedral sulfur atom have not been previously reported in the literature. The lattice water molecules self assembles the polymeric chains of 1 into a 3D supramolecular architecture via C-H center dot center dot center dot O hydrogen bonding interactions. The cationic units in the crystal structure of 2 self assembles via O-H center dot center dot center dot Cl, N-H center dot center dot center dot Cl and C-H center dot center dot center dot Cl weak hydrogen bonding interactions into a 2D supramolecular architecture induced by chloride anions in the lattice. PXRD patterns of 1 and 2 demonstrate good phase purity of the complexes. In addition, the thermal behaviour of the complexes has also been investigated.

COA of Formula: C5H8N2. About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Gogoi, A; Nashre-ul-Islam, SM; Frontera, A; Bhattacharyya, MK or concate me.

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Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

An article The first tris-heteroleptic copper cage, ligated by germsesquioxanes, 2,2 ‘-bipyridines and 3,5-dimethylpyrazolates. Synthesis, structure and unique catalytic activity in oxidation of alkanes and alcohols with peroxides WOS:000485104600024 published article about HYDROGEN-PEROXIDE; IRIDIUM(III) COMPLEXES; RUTHENIUM(II) COMPLEXES; IRON COMPLEXES; LIGANDS; FRAMEWORKS; CLUSTER; FUNCTIONALIZATION; HYDROPEROXIDATION; TRIS(DIIMINE) in [Kulakova, A. N.; Levitsky, M. M.; Shul’pina, L. S.; Shubina, E. S.; Ikonnikov, N. S.; Bilyachenko, A. N.] Russian Acad Sci, Nesmeyanov Inst Organoelement Cpds, Vavilova Str 28, Moscow 119991, Russia; [Kulakova, A. N.; Khrustalev, V. N.; Bilyachenko, A. N.; Shul’pin, G. B.] Peoples Friendship Univ Russia, Miklukho Maklay Str 6, Moscow 117198, Russia; [Sedykh, E. E.] Moscow South Eastern Sch, Zelenodolskaya Str 32-6, Moscow 109457, Russia; [Dorovatovskii, P. V.] Kurchatov Inst, Natl Res Ctr, Akad Kurchatova Pl 1, Moscow, Russia; [Kozlov, Y. N.; Shul’pin, G. B.] Russian Acad Sci, NN Semenov Inst Chem Phys, Ul Kosygina,Dom 4, Moscow 119991, Russia; [Kozlov, Y. N.; Shul’pin, G. B.] Plekhanov Russian Univ Econ, Stremyannyi Pereulok,Dom 36, Moscow 117997, Russia in 2019.0, Cited 92.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6. SDS of cas: 67-51-6

Self-assembly reaction of copper(II) ions and triple set of ligands (phenylgermaniumsesquioxane, 2,2′-bipyridine, 3,5-dimethylpyrazolate) results in the formation of the first example of tris-heteroleptic copper cage product (PhGeO2)(10)Cu-6(2,2′-bipy)(2)(3,5-Me(2)Pz)(2) (1). The ligation styles of complex’ components are different and includes (i) O-coordination from two cyclic pentamembered germsesquioxanes, (ii) N-coordination from two deprotonated 3,5-dimethylpyrazoles, (iii) N-ligation from two 2,2′-bipyridines. These features as well as other details of structure of 1 were established by X-day diffraction study. Analysis of the regioselectivity parameters found for the oxidation of linear and branched alkanes led to a conclusion that the reaction mechanism includes the formation of HO center dot radicals. However, the kinetic peculiarities of the cyclohexane oxidation with H2O2 in acetonitrile allowed to assume that the oxidation proceeds predominantly in a cavity generated inside of the tris-heteroleptic copper cage but not in the solution volume. (C) 2019 Elsevier B.V. All rights reserved.

About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Kulakova, AN; Sedykh, EE; Levitsky, MM; Dorovatovskii, PV; Khrustalev, VN; Shul’pina, LS; Shubina, ES; Kozlov, YN; Ikonnikov, NS; Bilyachenko, AN; Shul’pin, GB or concate me.. SDS of cas: 67-51-6

Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

SDS of cas: 67-51-6. In 2019.0 CHEM SCI published article about LATE-STAGE FUNCTIONALIZATION; DIAZO-COMPOUNDS; RH(III)-CATALYZED SYNTHESIS; BOND FUNCTIONALIZATION; DIRECT ARYLATION; CROSS-COUPLINGS; ACCESS; OLEFINATION; OXIDES; CYCLIZATION in [Dong, Yi; Chen, Jiajing; Zou, Wenxing; Lin, Songwen; Xu, Heng] Chinese Acad Med Sci, Peking Union Med Coll, Inst Mat Med, State Key Lab Bioact Subst & Funct Nat Med, Beijing 100050, Peoples R China; [Dong, Yi; Chen, Jiajing; Zou, Wenxing; Lin, Songwen; Xu, Heng] Chinese Acad Med Sci, Peking Union Med Coll, Inst Mat Med, Beijing Key Lab Act Subst Discovery & Druggabil E, Beijing 100050, Peoples R China; [Zhang, XuePeng] Peking Univ, Shenzhen Grad Sch, Lab Computat & Drug Design, Shenzhen 518055, Peoples R China in 2019.0, Cited 93.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6.

The limitations of arene C-H functionalization of aryl sulfonamides containing strongly coordinating Nheterocycles were overcome using a Rh(III) catalyst. The site-selectivity of C-H carbenoid functionalization at the ortho position relative to either the sulfonamide or N-heterocycle directing groups was elegantly switched using solvents of different polarities and different additive concentrations. Importantly, sulfonamide-group-directed ortho-C-H carbenoid functionalization tolerated strongly coordinating N-heterocycles, including pyridine, pyrrole, thiazole, pyrimidine, and pyrazine. Density functional theory (DFT) calculations were performed to rationalize the reaction mechanisms and the influence of reaction polarity.

About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Dong, Y; Zhang, XP; Chen, JJ; Zou, WX; Lin, SW; Xu, H or concate me.. SDS of cas: 67-51-6

Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

An article Direct N-Glycosylation of Amides/Amines with Glycal Donors WOS:000538764000062 published article about O-GLYCOSYLATION; AMIDE; REARRANGEMENT; CONSTRUCTION; GLYCOPROTEIN; INHIBITOR; DESIGN; CANCER in [Wang, Ying; Yao, Hui; Hua, Min; Jiao, Yang; He, Haibo; Liu, Mingguo; Huang, Nianyu; Zou, Kun] China Three Gorges Univ, Coll Biol & Pharmaceut Sci, Hubei Key Lab Nat Prod Res & Dev, Yichang 443002, Peoples R China in 2020.0, Cited 36.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6. COA of Formula: C5H8N2

Direct N-glycosylation between glycals and amides/amines was achieved with exclusive stereoselectivity in moderate to high yields. Various amides, amines, and 3,4-O-carbonate-glycals were tolerated, and unique beta-N-glycosides were obtained. The strategy was based on palladium-catalyzed decarboxylative allylation, and the high 1,4-cis-selectivity was proposed because of the hydrogen bonding effect. Notably, all the synthesized products were subjected to preliminary bioactivity studies, revealing that three compounds were cytotoxic to tumor cells and nontoxic to normal human cells.

COA of Formula: C5H8N2. About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Wang, Y; Yao, H; Hua, M; Jiao, Y; He, HB; Liu, MG; Huang, NY; Zou, K or concate me.

Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

Category: pyrazoles-derivatives. In 2021.0 J MOL STRUCT published article about ANION-PI INTERACTIONS; X-RAY-STRUCTURE; CRYSTAL-STRUCTURE; SUPRAMOLECULAR ASSOCIATION; METAL-COMPLEXES; PYRIDINE-2,6-DICARBOXYLIC ACID; STRUCTURAL FEATURES; HOLE INTERACTION; HYDROGEN-BOND; CU(II) in [Das, Amal; Sharma, Pranay; Bhattacharyy, Manjit K.] Cotton Univ, Dept Chem, Gauhati 781001, Assam, India; [Frontera, Antonio; Barcelo-Oliver, Miquel] Univ Ies Illes Balears, Dept Quim, Crta Valldemossa Km 7-7, Palma De Mallorca 07122, Baleares, Spain; [Verma, Akalesh K.] Cotton Univ, Dept Zool, Cell & Biochem Technol Lab, Gauhati 781001, Assam, India; [Hussain, Sahid] Indian Inst Technol Patna, Dept Chem, Patna 801103, Bihar, India in 2021.0, Cited 128.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6.

Two new coordination compounds viz. [Ni(2,6-PDC)(Hdmpz)(H2O)(2)]center dot H2O (1) and [Zn(3-CNpy)(2)Cl-2] (2) (2,6-PDC = 2,6-pyridinedicarboxylate, Hdmpz = 3,5-dimethylpyrazole, 3-CNpy = 3-cyanopyridine) have been synthesized and characterized using elemental analysis, thermogravimetric analysis, electronic, infrared spectroscopy and single crystal X-ray diffraction techniques. Crystal structure analyses reveal the presence of supramolecular assemblies involving interesting dimers with unconventional contacts in the compounds. DFT (Density Functional Theory) calculations on the supramolecular dimers in the crystal structure of 1 reveal that the sum of contributions of anion-pi, pi-pi and other long range interactions due to the approximation of the bulk monomers is energetically significant. Molecular Electrostatic Potential (MEP) surface and Quantum Theory of Atoms in Molecules (QTAIM) analyses on the interesting supramolecular dimers of the crystal structures of 2 reveal the presence of unconventional anion center dot center dot center dot pi contacts involving coordinated chlorido ligands and C-H center dot center dot center dot pi(nitrile) interactions involving the pi-system of the nitrile moiety of 3-cyanopyridine. Remarkably, Atoms in Molecules analysis also confirms the existence of energetically significant unconventional anti-parallel nitrile center dot center dot center dot nitrile interaction in the crystal structure of 2. Cell cytotoxicity of the compounds performed in Dalton’s lymphoma (DL) malignant cancer cell line showed effective potency with negligible cytotoxicity in normal cells (similar to 12%). It is interesting that compound 1has excellent cytotoxic potency with IC50 closer to cisplatin and can bind different biological targets with similar signalling pathways. Structure activity relationship (SAR) analyses of 1 and 2 based on pharmacophore modelling reveal that the molecular features associated with the structures of the compounds play important role in the biological activities. (C) 2020 Elsevier B.V. All rights reserved.

Category: pyrazoles-derivatives. About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Das, A; Sharma, P; Frontera, A; Verma, AK; Barcelo-Oliver, M; Hussain, S; Bhattacharyy, MK or concate me.

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Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics

An article Electronic and Photophysical Properties of Re-I(CO)(3)Br Complexes Modulated by Pyrazolyl-Pyridazine Ligands WOS:000462921900018 published article about RHENIUM(I) TRICARBONYL COMPLEXES; BRIDGING 1,2-DIAZINE LIGANDS; RE-I COMPLEX; CRYSTAL-STRUCTURES; PHOTOCATALYTIC REDUCTION; COPPER(II) COMPLEXES; SINGLET OXYGEN; EXCITED-STATE; MAGNETOSTRUCTURAL CORRELATIONS; ORGANOMETALLIC COMPLEXES in [Saldia, Marianela; Guzman, Nicolas; Palominos, Franco; Sandoval-Altamirano, Atalina; Pizarro, Nancy; Vega, Andres] Univ Andres Bello, Fac Ciencias Exactas, Dept Ciencias Quim, Av Quillota 980, Vina Del Mar 2531015, Chile; [Gunther, German] Univ Chile, Fac Ciencias Quim & Farmaceut, Dept Quim Organ & Fisicoquim, Sergio Livingstone 1007, Santiago 8380492, Chile; [Vega, Andres] CEDENNA, Ctr Desarrollo Nanociencia & Nanotecnol, Santiago, Chile; [Saldia, Marianela] Univ Cent, Fac Ciencias Salud, Inst Invest & Innovac Salud, Lord Cochrane 417, Santiago 8330507, Chile in 2019.0, Cited 90.0. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6. COA of Formula: C5H8N2

The direct reaction of a series of substituted (1H-pyrazol-1-yl)pyridazine (L-I: 6-(1H-pyrazolyl)pyridazine; L-II: 3-chloro-6-(1H-pyrazole-1-yl)-pyridazine; L-III: 6-(1H-3,5-dimethylpyrazolyl)pyridazine-3-carboxylic acid; L-IV: 3,6-bis-N-pyrazolyl-pyridazine; and L-V: 3,6-bis-N-3-methylpyrazolyl-pyridazine) with the bromotricarbonyl(tetrahydrofuran)rhenium(I) dimer leads to the monometallic complexes [(L-X)Re(CO)(3)Br] (I-V), which displays a nonregular octahedral geometry around the Re-I center and a fac-isomerism for the carbonyl groups, whereas pyridazine and pyrazolyl rings remain highly coplanar after coordination to rhenium. Cyclic voltammetry shows one irreversible oxidation and one irreversible reduction for each compound as measured in N, N-dimethylformamide. Oxidation ranges from 0.94 V for III to 1.04 V for I and have been attributed to the Re-I/Re-II couple. In contrast, the reductions are ligand centered, ranging from -1.64 V for II to -1.90 V for III and V. Density functional theory calculations on the vertical one electron oxidized and one electron reduced species, using the gas-phase optimized geometry for the neutral complex confirm this assignment. Compounds I-V show two absorption bands, one around 410 nm (metal-to-ligand charge transfer (MLCT), Re-d pi -> pi*) and the other at similar to 300 nm (intraligand, pi -> pi*). Excitation at 400 nm at 77 K leads to unstructured and monoexponential emission with large Stokes shift, whose maxima vary between 570 (III) and 636 (II) nm. The quantum yields for these emissions in solution are intensified strongly going from air to argon equilibrated solution. Singlet oxygen quantum yields change from 0.03 (III) to 0.21 (IV). These data are consistent with emission from (MLCT)-M-3. The emission undergoes a bathochromic shift when R-1 is a pi-donating group (Cl or N-pyrazolyl) and a hypsochromic shift for a pi-acceptor (COOH). The bimolecular emission quenching rate constant by triethylamine (TEA) for II, IV, and V is 1.09, 0.745, and 0.583 x 10(8) M-1 s(-1), respectively. Photolysis in dichloromethane-CO2 saturated solution with TEA as a sacrificial electron donor leads in all cases to formic acid generation.

About 3,5-Dimethyl-1H-pyrazole, If you have any questions, you can contact Saldia, M; Guzman, N; Palominos, F; Sandoval-Altamirano, A; Gunther, G; Pizarro, N; Vega, A or concate me.. COA of Formula: C5H8N2

Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics