Month: October 2021

Authors Karmakar, A; Paul, A; Rubio, GMDM; Soliman, MMA; Fatima, M; da Silva, CG; Pombeiro, AJL in FRONTIERS MEDIA SA published article about ACID; CATALYSIS; MOFS in [Karmakar, Anirban; Paul, Anup; Rubio, Guilherme M. D. M.; Soliman, Mohamed M. A.; Fatima, M.; Guedes da Silva, C.; Pombeiro, Armando J. L.] Univ Lisbon, Inst Super Tecn, Ctr Quim Estrutural, Lisbon, Portugal in 2019, Cited 31. Category: esters-buliding-blocks. The Name is Dimethyl 5-aminoisophthalate. Through research, I have a further understanding and discovery of 99-27-4

A pyridine-based amide functionalized tetracarboxylic acid, 5,5 ‘-(pyridine-2, 6-dicarbonyl)bis(azanediyl)}diisophthalic acid (H4L), was synthesized and its coordination chemistry toward zinc(II) and cadmium(II) ions was studied. The reactions of H4L with Zn(NO3)(2).6H(2)O and Cd(NO3)(2).4H(2)O led to its full or partial deprotonation, respectively, and the formation of the 2D coordination polymers [Zn-2(L)(H2O)(4)](n).4n(H2O) (1) and [Cd-3(HL)(2)(DMF)(4)](n).4n(DMF) (2) (DMF = N,N’-dimethylformamide), respectively. They were characterized by elemental analysis, FT-IR, photoluminescence, thermogravimetry, and single-crystal and powder X-ray diffraction. In 1, the L4- ligand is planar with every carboxylate anion binding a Zn(II) cation and giving rise to a 2D grid with the metals with tetrahedral environments. In 2, the combination of bridging HL3- and dimethylformamide to form trinuclear Cd(II) clusters engenders secondary building block units and generates a layer-type 2D network with the metals with octahedral and pentagonal bipyramid coordination geometries. The topological analyses of 1 and 2 reveal 2,4-connected and 3,6-connected binodal nets, respectively. On account of the presence of Lewis acid (Zn or Cd centers) as well as basic (uncoordinated pyridine and amide groups) sites, 1 and (to a much lower extent) 2 effectively catalyze the one-pot cascade deacetalization-Knoevenagel condensation reactions under quite mild conditions. They act as heterogeneous catalysts, being easy to recover and recycle without losing activity.

Category: esters-buliding-blocks. About Dimethyl 5-aminoisophthalate, If you have any questions, you can contact Karmakar, A; Paul, A; Rubio, GMDM; Soliman, MMA; Fatima, M; da Silva, CG; Pombeiro, AJL or concate me.

Reference:
Patent; ASTRA ZENECA AB; NPS PHARMACEUTICALS, INC.; WO2004/14881; (2004); A2;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

An article Photostable Ruthenium(II) Isocyanoborato Luminophores and Their Use in Energy Transfer and Photoredox Catalysis WOS:000669536600013 published article about SUBSTITUTED BIPYRIDYL COMPLEXES; CHARGE-TRANSFER STATES; ALPHA-AMINO-ACIDS; VISIBLE-LIGHT; POLYPYRIDINE COMPLEXES; IRIDIUM(III) COMPLEXES; ELECTRON-TRANSFER; DECARBOXYLATIVE ARYLATION; PHOTOINDUCED ELECTRON; REDUCTIVE-ELIMINATION in [Schmid, Lucius; Prescimone, Alessandro; Wenger, Oliver S.] Univ Basel, Dept Chem, CH-4056 Basel, Switzerland; [Kerzig, Christoph] Johannes Gutenberg Univ Mainz, Dept Chem, D-55128 Mainz, Germany in 2021, Cited 154. SDS of cas: 103-26-4. The Name is Methyl 3-phenyl-2-propenoate. Through research, I have a further understanding and discovery of 103-26-4

Ruthenium(II) polypyridine complexes are among the most popular sensitizers in photocatalysis, but they face some severe limitations concerning accessible excited-state energies and photostability that could hamper future applications. In this study, the borylation of heteroleptic ruthenium(II) cyanide complexes with alpha-diimine ancillary ligands is identified as a useful concept to elevate the energies of photoactive metal-to-ligand charge-transfer (MLCT) states and to obtain unusually photorobust compounds suitable for thermodynamically challenging energy transfer catalysis as well as oxidative and reductive photoredox catalysis. B(C6F5)(3) groups attached to the CN- ligands stabilize the metal-based t(2g)-like orbitals by similar to 0.8 eV, leading to high (MLCT)-M-3 energies (up to 2.50 eV) that are more typical for cyclometalated iridium(III) complexes. Through variation of their alpha-diimine ligands, nonradiative excited-state relaxation pathways involving higher-lying metal-centered states can be controlled, and their luminescence quantum yields and MLCT lifetimes can be optimized. These combined properties make the respective isocyanoborato complexes amenable to photochemical reactions for which common ruthenium(II)-based sensitizers are unsuited, due to a lack of sufficient triplet energy or excited-state redox power. Specifically, this includes photoisomerization reactions, sensitization of nickel-catalyzed cross-couplings, pinacol couplings, and oxidative decarboxylative C-C couplings. Our work is relevant in the greater context of tailoring photoactive coordination compounds to current challenges in synthetic photochemistry and solar energy conversion.

About Methyl 3-phenyl-2-propenoate, If you have any questions, you can contact Schmid, L; Kerzig, C; Prescimone, A; Wenger, OS or concate me.. SDS of cas: 103-26-4

Reference:
Article; Weng, Shiue-Shien; Ke, Chih-Shueh; Chen, Fong-Kuang; Lyu, You-Fu; Lin, Guan-Ying; Tetrahedron; vol. 67; 9; (2011); p. 1640 – 1648;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

An article Comprehensive insights into xylan structure evolution via multi-perspective analysis during slow pyrolysis process WOS:000458225800001 published article about BIOMASS PYROLYSIS; MECHANISTIC MODEL; CORN STALK; HEMICELLULOSE; CELLULOSE; LIGNIN; POLYSACCHARIDES; COMPONENTS; BEHAVIORS; PRODUCTS in [Liang, Jiajin; Chen, Jiao; Wu, Shubin; Liu, Chao; Lei, Ming] South China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510640, Guangdong, Peoples R China in 2019, Cited 42. The Name is Methyl 2,2-dimethoxyacetate. Through research, I have a further understanding and discovery of 89-91-8. HPLC of Formula: C5H10O4

Comprehension in hemicellulose pyrolysis is critical to generate renewable fuel and valuable chemical. Herein, a self-designed tubular reactor was applied to observe the appearance alteration and chemical structure evolution during the whole xylan pyrolysis process. Before 200 degrees C, it was free moisture removal stage without significant chemical structure alteration. Xylan began to depolymerize at 200 degrees C corresponding with the appearance change from its original state to dark brown, cleavage of branched-chain and primary product acids & ketones generation. The main chain of xylan was completely broken at 250-350 degrees C via beta-1,4-glycosidic bond cleavage, dehydration, decarboxylation, and decarbonylation reaction. Acids were mainly originated from hemicellulose pyrolysis. The typical signals from FTIR,C-13 CP/MAS NMR were disappeared at 350 degrees C. In the carbonation stage, the C/H and C/O ratio reached 2.01 and 4.54, leading to the aromaticity enhancement of char and formation of carbon-centered radicals.

HPLC of Formula: C5H10O4. About Methyl 2,2-dimethoxyacetate, If you have any questions, you can contact Liang, JJ; Chen, J; Wu, SB; Liu, C; Lei, M or concate me.

Reference:
Patent; U C B, Societe Anonyme; US4041077; (1977); A;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

An article Volatome finger printing of red wines made from grapes grown under tropical conditions of India using thermal-desorption gas chromatography-mass spectrometry (TD-GC/MS) WOS:000495355600002 published article about VOLATILE COMPOUNDS; CABERNET-SAUVIGNON; YOUNG WINES; QUANTITATIVE-ANALYSIS; IMPACT ODORANTS; AROMA; COMPONENTS; QUANTIFICATION; IDENTIFICATION; EXTRACTION in [Somkuwar, R. G.; Sharma, A. K.; Kambale, Narayan; Banerjee, Kaushik; Bhange, M. A.; Oulkar, D. P.] ICAR Natl Res Ctr Grapes, Pune 412307, Maharashtra, India in 2020, Cited 37. Formula: C5H10O4. The Name is Methyl 2,2-dimethoxyacetate. Through research, I have a further understanding and discovery of 89-91-8

The current study evaluated the key characters of aroma composition in diversified red wines (Cinsaut, Grenache, Cabernet Franc, Petit Verdot, Cabernet Sauvignon, Nielluccio, Tempranillo, Syrah, Merlot and Caladoc). Out of hundreds of volatile compounds 64 compounds were considered for study. Different groups consisting of fatty acids, volatile alcohols, aldehydes, esters, volatile phenols and terpenes were analysed using gas chromatography mass spectrometry coupled with thermal desorption (TD-GC-MS). Among all these diversified classes, alcohols were found as the most dominant group followed by esters and acids whereas aldehydes, phenols and terpenes were found to be minor compounds. Among the varieties, Nielluccio wine recorded highest concentration of total volatile compounds (191.53 mg/L) while, it was least in Caladoc wines (15.45 mg/L). The principal component analysis clearly differentiated Grenache wines based on their relationships between scores and their aroma composition followed by Nielluccio and Cinsuat wines. Out of sixty four compounds, only six aromatic compounds viz. butanediol, isoamyl actate, gamma-Terpene, butanol, acetic acid and furfural have satisfying aroma descriptors with floral and fruity nuances and contribute to differentiate the Grenache wines from other varieties which have similar scores in PC1 analysis. The cluster analysis also suggested that the wines in the same group (Cinsaut, Tempranillo and Syrah), (Cabernet Franc, Cabernet Sauvignon, Caladoc and Merlot) and (Nielluccio and Petit Verdot) had similar aroma characterization. Grenache wines were well differentiated from the sub group formed by other red varieties.

About Methyl 2,2-dimethoxyacetate, If you have any questions, you can contact Somkuwar, RG; Sharma, AK; Kambale, N; Banerjee, K; Bhange, MA; Oulkar, DP or concate me.. Formula: C5H10O4

Reference:
Patent; U C B, Societe Anonyme; US4041077; (1977); A;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Quality Control of 6H-Benzo[c]chromen-6-one. I found the field of Chemistry very interesting. Saw the article Functionalized spirolactones by photoinduced dearomatization of biaryl compounds published in 2019.0, Reprint Addresses Wang, F (corresponding author), DICP, Dalian Natl Lab Clean Energy DNL, SKLC, Dalian 116023, Peoples R China.; Samec, JSM (corresponding author), Stockholm Univ, Dept Organ Chem, SE-10691 Stockholm, Sweden.. The CAS is 2005-10-9. Through research, I have a further understanding and discovery of 6H-Benzo[c]chromen-6-one.

The idea of using biaryl structures to generate synthetic building blocks such as spirolactones is attractive because biaryl structures are abundant in biomass waste streams. However, the inertness of aromatic rings of biaryls makes it challenging to transform them into functionalized structures. In this work, we developed photoinduced dearomatization of nonphenolic biaryl compounds to generate spirolactones. We demonstrate that dearomatization can be performed via either aerobic photocatalysis or anaerobic photooxidation to tolerate specific synthetic conditions. In both pathways, dearomatization is induced by electrophilic attack of the carboxyl radical. The resulting spirodiene radical is captured by either oxygen or water in aerobic and anaerobic systems, respectively, to generate the spirodienone. These methods represent novel routes to synthesize spirolactones from the biaryl motif.

Quality Control of 6H-Benzo[c]chromen-6-one. About 6H-Benzo[c]chromen-6-one, If you have any questions, you can contact Li, HJ; Subbotina, E; Bunrit, A; Wang, F; Samec, JSM or concate me.

Reference:
Article; Zhang, Jian; Shi, Dongdong; Zhang, Haifeng; Xu, Zheng; Bao, Hanyang; Jin, Hongwei; Liu, Yunkui; Tetrahedron; vol. 73; 2; (2017); p. 154 – 163;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

I found the field of Chemistry; Energy & Fuels; Engineering very interesting. Saw the article Comprehensive insights into xylan structure evolution via multi-perspective analysis during slow pyrolysis process published in 2019. SDS of cas: 89-91-8, Reprint Addresses Wu, SB (corresponding author), South China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510640, Guangdong, Peoples R China.. The CAS is 89-91-8. Through research, I have a further understanding and discovery of Methyl 2,2-dimethoxyacetate

Comprehension in hemicellulose pyrolysis is critical to generate renewable fuel and valuable chemical. Herein, a self-designed tubular reactor was applied to observe the appearance alteration and chemical structure evolution during the whole xylan pyrolysis process. Before 200 degrees C, it was free moisture removal stage without significant chemical structure alteration. Xylan began to depolymerize at 200 degrees C corresponding with the appearance change from its original state to dark brown, cleavage of branched-chain and primary product acids & ketones generation. The main chain of xylan was completely broken at 250-350 degrees C via beta-1,4-glycosidic bond cleavage, dehydration, decarboxylation, and decarbonylation reaction. Acids were mainly originated from hemicellulose pyrolysis. The typical signals from FTIR,C-13 CP/MAS NMR were disappeared at 350 degrees C. In the carbonation stage, the C/H and C/O ratio reached 2.01 and 4.54, leading to the aromaticity enhancement of char and formation of carbon-centered radicals.

About Methyl 2,2-dimethoxyacetate, If you have any questions, you can contact Liang, JJ; Chen, J; Wu, SB; Liu, C; Lei, M or concate me.. SDS of cas: 89-91-8

Reference:
Patent; U C B, Societe Anonyme; US4041077; (1977); A;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

An article Pyrimidopteridine N-Oxide Organic Photoredox Catalysts: Characterization, Application and Non-Covalent Interaction in Solid State WOS:000462057300011 published article about ELECTRON-TRANSFER PROCESS; Z ISOMERIZATION; PHOTOOXIDATIVE DECARBOXYLATION; PHOTOCATALYTIC E; PI INTERACTIONS; ACTIVATION; OXIDATION; CLEAVAGE in [Hauptmann, Richy; Petrosyan, Andranik; Cordero, Miguel A. Argueello; Surkus, Annette-E; Pospech, Jola] Univ Rostock, Leibniz Inst Catalysis, Albert Einstein Str 29a, D-18059 Rostock, Germany; [Fennel, Franziska; Cordero, Miguel A. Argueello] Univ Rostock, Inst Phys, Dynam Mol Syst, Albert Einstein Str 23-24, D-18059 Rostock, Germany in 2019.0, Cited 33.0. The Name is 6H-Benzo[c]chromen-6-one. Through research, I have a further understanding and discovery of 2005-10-9. Product Details of 2005-10-9

Herein we report the photo- and electrochemical characterization of pyrimidopteridine N-oxide-based heterocycles. The potential of their application as organic photoredox catalysts is showcased in the photomediated contra-thermodynamic E -> Z isomerization of cinnamic acid derivatives and oxidative cyclization of 2-phenyl benzoic acid to benzocoumarin using molecular oxygen as a mild oxidant. Furthermore, unprecedented intermolecular non-covalent n-pi-hole interactions in solid state are discussed based on crystallographic and theoretical data.

About 6H-Benzo[c]chromen-6-one, If you have any questions, you can contact Hauptmann, R; Petrosyan, A; Fennel, F; Cordero, MAA; Surkus, AE; Pospech, J or concate me.. Product Details of 2005-10-9

Reference:
Article; Zhang, Jian; Shi, Dongdong; Zhang, Haifeng; Xu, Zheng; Bao, Hanyang; Jin, Hongwei; Liu, Yunkui; Tetrahedron; vol. 73; 2; (2017); p. 154 – 163;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Recently I am researching about CROSS-COUPLINGS; ENANTIOSELECTIVE ADDITION; ESTERIFICATION; ACTIVATION; CONVERSION; REAGENTS; ALKENES, Saw an article supported by the National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21931010]; National Key Research and Development Program of China [2017YFA0207302]; Program for Changjiang Scholars and Innovative Research Team in University of the Ministry of Education, China. Safety of Methyl 3-phenylpropionate. Published in SCIENCE PRESS in BEIJING ,Authors: Chen, H; Chen, DH; Huang, PQ. The CAS is 103-25-3. Through research, I have a further understanding and discovery of Methyl 3-phenylpropionate

N-Acylpyrrole-type amides are a class of versatile building blocks in asymmetric synthesis. We report that by employing Ni(COD)(2)/2,2 ‘-bipyridine (5 mol%) catalytic system, the direct, catalytic alcoholysis of N-acylpyrrole-type aromatic and aliphatic amides with both primary and secondary alcohols can be achieved efficiently under very mild conditions (rt, 1 h) even at gram scale. By increasing the catalyst loading to 10 mol%, prolonging reaction time (18 h), and/or elevating reaction temperature to 50 degrees C/80 degrees C, the reaction could be extended to both complex and hindered N-acylpyrroles as well as to N-acylpyrazoles, Nacylindoles, and to other (functionalized) primary and secondary alcohols. In all cases, only 1.5 equiv. of alcohol were used. The value of the method has been demonstrated by the racemization-free, catalytic alcoholysis of chiral amides yielded from other asymmetric methodologies.

About Methyl 3-phenylpropionate, If you have any questions, you can contact Chen, H; Chen, DH; Huang, PQ or concate me.. Safety of Methyl 3-phenylpropionate

Reference:
Patent; SANOFI; US2011/294788; (2011); A1;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

An article alpha-Branched Ketone Dienolates: Base-Catalysed Generation and Regio- and Enantioselective Addition Reactions WOS:000484154000022 published article about VINYLOGOUS ALDOL REACTION; ORGANOCATALYTIC MICHAEL ADDITION; MANNICH-TYPE REACTIONS; DIELS-ALDER REACTION; ALLYL ARYL KETONES; ASYMMETRIC-SYNTHESIS; GAMMA-BUTENOLIDES; CYCLIC-KETONES; ALPHA,BETA-UNSATURATED ALDEHYDES; 3-ALKYLIDENE OXINDOLES in [Urruzuno, Inaki; Mugica, Odei; Zanella, Giovanna; Vera, Silvia; Gomez-Bengoa, Enrique; Oiarbide, Mikel; Palomo, Claudio] Univ Pais Vasco UPV EHU, Dept Quim Organ 1, Manuel Lardizabal 3, San Sebastian 20018, Spain in 2019, Cited 137. The Name is Dimethyl 5-aminoisophthalate. Through research, I have a further understanding and discovery of 99-27-4. Recommanded Product: Dimethyl 5-aminoisophthalate

In this study, the unique capacity of bifunctional BrOnsted bases to generate alpha-branched ketone dienolates and control both site- and stereoselectivity of their addition reactions to representative classes of carbon electrophiles (i.e., vinyl sulfones, nitroolefins, formaldehyde) is documented. We demonstrate that by using selected chiral tertiary amine/squaramide catalysts, the reactions of beta,gamma-unsaturated cycloalkanones proceed through the dienolate C alpha almost exclusively and provide all-carbon quaternary cyclic ketone adducts in good yields with very high enantioselectivities. A minor amount (<5%) of gamma-addition is observed when nitroolefins are used as electrophiles. The parent acyclic ketone dienolates proved to be less reactive under these conditions, and thus still constitute a challenging class of substrates. Quantum chemical calculations correctly predict these differences in reactivity and explain the observed site-specificity and enantioselectivity. About Dimethyl 5-aminoisophthalate, If you have any questions, you can contact Urruzuno, I; Mugica, O; Zanella, G; Vera, S; Gomez-Bengoa, E; Oiarbide, M; Palomo, C or concate me.. Recommanded Product: Dimethyl 5-aminoisophthalate

Reference:
Patent; ASTRA ZENECA AB; NPS PHARMACEUTICALS, INC.; WO2004/14881; (2004); A2;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Hanashima, M; Matsumura, T; Asaji, Y; Yoshimura, T; Matsuo, J in [Hanashima, Mika; Matsumura, Toshiki; Asaji, Yuta; Yoshimura, Tomoyuki; Matsuo, Jun-ichi] Kanazawa Univ, Grad Sch Med Sci, Div Pharmaceut Sci, Kakuma Machi, Kanazawa, Ishikawa 9201192, Japan published Bridged-Selective Intramolecular Diels-Alder Reactions in the Synthesis of Bicyclo[2.2.2]octanes in 2020.0, Cited 40.0. COA of Formula: C13H8O2. The Name is 6H-Benzo[c]chromen-6-one. Through research, I have a further understanding and discovery of 2005-10-9.

Regioselectivity for intramolecular Diels-Alder (IMDA) reactions of 6-acetoxy-6-alkenylcyclohexa-2,4-dien-1-ones that were formed by oxidation of 2-alkenylphenols with lead tetraacetate in acetic acid were studied. Bridged regioselectivity was observed in the IMDA reactions of 6-acetoxy-6-alkenylcyclohexa-2,4-dien-1-ones having a dienophile part which could conjugate with an aromatic group. Bridged seven-and eight-membered rings and bicyclo[2.2.2]octane skeletons were constructed by the present IMDA reactions. Density functional theory (DFT) calculations suggested that conjugation of the dienophile with neighboring aromatic groups lowered the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) energy gap and preceded bridged [4 + 2] adducts.

COA of Formula: C13H8O2. About 6H-Benzo[c]chromen-6-one, If you have any questions, you can contact Hanashima, M; Matsumura, T; Asaji, Y; Yoshimura, T; Matsuo, J or concate me.

Reference:
Article; Zhang, Jian; Shi, Dongdong; Zhang, Haifeng; Xu, Zheng; Bao, Hanyang; Jin, Hongwei; Liu, Yunkui; Tetrahedron; vol. 73; 2; (2017); p. 154 – 163;,
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics