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: 861909-53-7, is researched, SMILESS is OP1(OC2=C(C3=CC(C)=CC(C)=C3)C=C4C=CC=CC4=C2C5=C6C=CC=CC6=CC(C7=CC(C)=CC(C)=C7)=C5O1)=O, Molecular C36H29O4PJournal, Article, Research Support, Non-U.S. Gov’t, Angewandte Chemie, International Edition called Gold-catalyzed [3+2]-annulations of α-aryl diazoketones with the tetrasubstituted alkenes of cyclopentadienes: High stereoselectivity and enantioselectivity, Author is Chen, Ching-Nung; Cheng, Wei-Min; Wang, Jian-Kai; Chao, Tzu-Hsuan; Cheng, Mu-Jeng; Liu, Rai-Shung, the main research direction is dihydrofuran bicyclic regioselective enantioselective diastereoselective synthesis solvent effect; aryl diazoketone stereoselective enantioselective annulation alkene cyclopentadiene gold catalyst; cyclization reaction mechanism chirality transition state DFT crystal structure; Cloke-Wilson rearrangement; [3+2]-annulations; gold catalysis; tetrasubstituted alkenes; α-diazo ketones.Computed Properties of C36H29O4P.

This work reports gold-catalyzed [3+2]-annulations of α-diazo ketones with highly substituted cyclopentadienes, affording bicyclic 2,3-dihydrofurans with high regio- and stereoselectivity. The reactions highlights the first success of tetrasubstituted alkenes to undergo [3+2]-annulations with α-diazo carbonyls. The enantioselective annulations are also achieved with high enantioselectivity using chiral forms of gold and phosphoric acid. Our mechanistic anal. supports that cyclopentadienes serve as nucleophiles to attack gold carbenes at the more substituted alkenes, yielding gold enolates that complex with chiral phosphoric acid to enhance the enantioselectivity.

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Recommanded Product: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine. 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: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine, is researched, Molecular C36H30NO2P, CAS is 415918-91-1, about Palladium-Catalyzed Enantioselective Cycloadditions of Aliphatic 1,4-Dipoles: Access to Chiral Cyclohexanes and Spiro [2.4] heptanes. Author is Trost, Barry M.; Jiao, Zhiwei; Liu, Ying; Min, Chang; Hung, Chao-I. Joey.

Design and exploration of new intermediates for chemo-, regio-, and stereoselective cycloadditions remain a formidable challenge in modern organic synthesis. Compared to the well-developed 1,3-dipolar cycloadditions, Pd-catalyzed 1,4-dipolar cycloadditions are generally limited to specialized substrates due to the inherent nature of the thermodynamically driven intramol. transformations and undesired isomerizations. Herein, we demonstrate the use of ligated palladium catalysts to control and modulate the intermol. reactivity of aliphatic 1,4-dipoles, enabling two distinctive cycloaddition pathways with a broad scope of acceptors. This atom-economic process also features an eco-friendly in situ deprotonation strategy to generate the corresponding active palladium-mediated dipoles. Overall, a diverse array of chiral 6-membered rings and spiro [2.4] heptanes were prepared in high yield and selectivity. In addition, an unexpected property of cyano-stabilized carbanions was discovered and investigated, which can be useful in designing and predicting future transformations.

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Dent, Andrew; Evans, John; Newton, Mark; Corker, Judith; Russell, Andrea; Abdul Rahman, M. B.; Fiddy, Steven; Mathew, Rebecca; Farrow, Richard; Salvini, Giuseppe; Atkinson, Phillip published an article about the compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4,SMILESS:CC(C)(C1=O[Ni+2]2(O=C(C(C)(C)C)[CH-]1)O=C([CH-]C(C(C)(C)C)=O2)C(C)(C)C)C ).Related Products of 14481-08-4. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:14481-08-4) through the article.

A long program involving the development of a fast linear and stable detector, and the recent upgrade of the bent monochromator to a 4-point one at station 9.3 Daresbury Laboratory is showing results such that it has now become possible to obtain analyzable XAFS data on 50mM solutions in time scales of a second or less. Three examples of such data are shown: a homogeneous Ni catalyst reaction using a stopped flow system, a heterogeneous catalyst reduction showing time dependent data collected in a microreactor, and an electrochem. system showing the oxidation of small Pt particles as the potential is changed. The improvements have come from two major developments – the monochromator and the detector.

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Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, ACS Catalysis called Mild Acylation of C(sp3)-H and C(sp2)-H Bonds under Redox-Neutral Rh(III) Catalysis, Author is Yu, Songjie; Li, Yingzi; Kong, Lingheng; Zhou, Xukai; Tang, Guodong; Lan, Yu; Li, Xingwei, which mentions a compound: 178396-31-1, SMILESS is CC1=CC(Br)=CC2=C1N=CC=C2, Molecular C10H8BrN, Synthetic Route of C10H8BrN.

Carbonyl groups are ubiquitous in functional mols. Although C-H bond acylation has been well-studied via different mechanisms, transition-metal-catalyzed redox-neutral C(sp3)-H acylation under mild conditions is unprecedented. In this work, ketene is designed as a acylating reagent for both C(sp3)-H and C(sp2)-H bonds under Rh(III) catalysis, affording a diverse array of carbonyl compounds in high yields and high atom economy under mild conditions.

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Name: cis-Diammine(1,1-cyclobutanedicarboxylato)platinum(II). 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: cis-Diammine(1,1-cyclobutanedicarboxylato)platinum(II), is researched, Molecular C6H12N2O4Pt, CAS is 41575-94-4, about Investigation of Hypersensitivity Reactions in Carboplatin Desensitization Therapy..

BACKGROUND/AIM: Carboplatin is a key drug in the treatment of ovarian cancer, but hypersensitivity reactions (HSRs) may occur with repeated use. PATIENTS AND METHODS: Thirty-seven ovarian cancer patients treated with carboplatin desensitization therapy were reviewed retrospectively. The treatment completion rate and toxicity were examined. RESULTS: The carboplatin desensitization completion rate was 86.5%. Toxicity was Grade 0, 1, 2, and 3 in 17, 5, 10, and 5 patients, respectively. Erythema was the most frequent toxicity (36.8%), most commonly affecting the arm (23.5%). Furthermore, all HSRs were classified into: skin, respiratory, digestive, circulatory, and neurological. The completion rate of desensitization was significantly lower in patients with two or more target organs affected (p<0.001). CONCLUSION: The main symptoms of HSRs, the most common sites of HSRs, and the criteria for discontinuing desensitization therapy identified in this study are useful information for the safe implementation of carboplatin desensitization therapy. When you point to this article, it is believed that you are also very interested in this compound(41575-94-4)Name: cis-Diammine(1,1-cyclobutanedicarboxylato)platinum(II) and due to space limitations, I can only present the most important information.

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Reference of (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: (11bR)-N,N-Bis[(1R)-1-phenylethyl]dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-amine, is researched, Molecular C36H30NO2P, CAS is 415918-91-1, about Enantioselective α-Functionalization of 1,3-Dithianes by Iridium-Catalyzed Allylic Substitution. Author is Wang, Panpan; Jiang, Qian; Zhao, Ruibo; Xie, Xingang; Tang, Shouchu; Wang, Xiaolei.

An iridium-catalyzed asym. allylic substitution reaction with 2-(alkoxycarbonyl)-1,3-dithianes has been achieved with high regio- and enantioselectivities. The transformation provides a new method for the enantioselective α-functionalization of dithianes. The corresponding dithiane-containing products are easily converted into many other derivatives with high yields and enantioselectivities.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Interactions of some nitrogen, oxygen, and sulfur heterocycles with gadolinium and nickel chelates. A carbon-13 nuclear magnetic resonance spin-lattice relaxation study, the main research direction is gadolinium coordination heterocycle NMR; nickel coordination heterocycle NMR; heterocycle complex magnetic relaxation; pyrrolidine complex magnetic relaxation; THF complex magnetic relaxation; tetrahydrothiophene complex magnetic relaxation; pyrrole magnetic relaxation; furan magnetic relaxation; thiophene magnetic relaxation.Related Products of 14481-08-4.

The interaction of pyrrole, pyrrolidine, furan, THF, thiophene, and tetrahydrothiophene with GdL3 and NiL2 (L = 2,2,6,6-tetramethylheptane-3,5-dionate) was studied by determination of electron-nuclear spin-lattice relaxation times for 13C in natural abundance. The results indicate complex formation between GdL3 and pyrrolidine and THF, and between NiL2 and pyrrolidine, THF, and tetrahydrothiophene. Competition experiments gave the relative affinities of the metal chelates for different ligand donor atoms: N > O > S for GdL3, and N > O ≈ S for NiL2. In the case of NiL2, the relaxation rates deviate largely from the predictions of the Solomon-Bloembergen equation; this was discussed in relation to contact shift measurements.

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Harding, Phimphaka; Harding, David J.; Phonsri, Wasinee; Saithong, Saowanit; Phetmung, Hirihattaya published the article 《Synthesis and electrochemical studies of octahedral nickel β-diketonate complexes》. Keywords: nickel diketonate diimine ethylenediamine complex preparation; electrochem oxidation nickel diketonate diimine ethylenediamine complex; crystal structure nickel diketonate diimine ethylenediamine complex.They researched the compound: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II)( cas:14481-08-4 ).Category: esters-buliding-blocks. 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:14481-08-4) here.

The reaction of [Ni(tmhd)2] and [Ni(dbm)2] (Htmhd = 2,2,6,6-tetramethylheptane-3,5-dione; Hdbm = dibenzoylmethane) with N-donor chelating ligands in CH2Cl2 and acetone, resp., yields [Ni(tmhd)2(L-L)] (L-L = 2,2′-bpy 1, phen 2 and dmae (2-dimethylaminoethyl)amine 3) and [Ni(dbm)2(L-L)] (L-L = 2,2′-bpy 4, phen 5, dmae 6). UV-visible spectroscopy shows very strong bands in the UV region consistent with ligand centered π → π* transitions. The electrochem. studies of 1-6 reveal oxidation to Ni(III). The [Ni(tmhd)2(L-L)] 1-3 are more easily oxidized by ∼300 mV and are quasi-reversible whereas for the [Ni(dbm)2(L-L)] series only complex 6 shows significant reversibility. X-ray crystallog. studies were conducted in the case of [Ni(dbm)2(phen)] 5 and [Ni(dbm)2(dmae)] 6. The structures both show that the Ni metal center is octahedral with an O4N2 coordination environment. In the structures the β-diketonate ligands exhibit a cis-arrangement, with the metal displaced out of the planar chelate ring.

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Reference of Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II). 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: Bis(2,2,6,6-tetramethyl-3,5-heptanedionato)nickel(II), is researched, Molecular C22H38NiO4, CAS is 14481-08-4, about Thermochemical properties of the chelate complexes of some 3d-electron elements with 2,2,6,6-tetramethylheptane-3,5-dione. Part II. Complexes of nickel(II), copper(II) and zinc(II). Author is Giera, Edward; Kakolowicz, Wladyslaw.

The standard molar enthalpies of formation of Ni(II), Cu(II) and Zn(II) complexes with 2,2,6,6-tetramethylheptane-3,5-dione (dipivaloylmethane, HDPM) were determined by solution calorimetry. The enthalpies of hypothetical dissociation processes of complexes in the gaseous phase were calculated to determine the mean bond dissociation energies 〈D〉(M-O) and the mean coordinate bond dissociation energies 〈DCB〉(M-O): M(DPM)2(g) = M(g) + 2DPM.(g) and M(DPM)2(g) = M2+(g) + 2DPM-(g), resp. The thermochem. crystal-field stabilization energies were determined for Fe(II), Co(II), Ni(II) and Cu(II) complexes.

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Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

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: 415918-91-1, is researched, SMILESS is C[C@@H](N(P1OC2=CC=C3C=CC=CC3=C2C4=C5C=CC=CC5=CC=C4O1)[C@@H](C6=CC=CC=C6)C)C7=CC=CC=C7, Molecular C36H30NO2PJournal, Article, Angewandte Chemie, International Edition called The Supramolecular Balance for Transition-Metal Complexes: Assessment of Noncovalent Interactions in Phosphoramidite Palladium Complexes, Author is Hartmann, Evelyn; Gschwind, Ruth M., the main research direction is noncovalent interaction palladium phosphoramidite NMR.SDS of cas: 415918-91-1.

The authors have presented a method to determine exptl. and quant. the contribution of noncovalent interactions within transition-metal complexes. In this general approach the ΔΔG value of two complex equilibrium is used as a measure for the deviating noncovalent interactions within the two hetero-complexes. The two equilibrium are energetically linked by the combination of one enantiopure ligand with two enantiomeric ligands, leading to identical or enantiomeric homo-complexes. This allows for the separation of supramol. interactions from stereoelectronic and electrostatic properties provided that the general complex structure is retained. Since this method uses deviating intra-complex interactions within two hetero-complexes, solvation effects of the interacting functional groups are of minor importance. The applicability of this approach was proven with phosphoramidite palladium complexes. The mutual exchange of the CH3 and the Ph groups from one ligand to its enantiomer is directly reflected in the NMR data. The exptl. determined ΔΔG value is of the right order of magnitude for the observed changes in the interaction pattern. This example proves for the first time that the catalytically highly important class of phosphoramidite ligands show a pseudo-bidentate character in solution and that modulations in the extended planar CH-π and π-π interaction interfaces cause significant energetic differences.

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Reference:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics