A Rh-catalyzed intermolecular coupling of diazomalonates with arene C–H bonds is reported. The reaction initiated by electrophilic activation, which followed the arylrhodium(III) complex diazomalonate. In most cases, arenes oximes, carboxylic acids, and amines as directing groups cross-couple excellent regioselectivities functional group tolerance, thus, this offers a new route to α-aryl carbonyl compounds for specific applications.

The single-stranded coordination polymer [Ag7(tpst)4(ClO4)2(NO3)5]n was synthesized by the self-assembly of a silver salt and multidentate ligand 2,4,6-tris[(4-pyridyl)methylsulfanyl]-1,3,5-triazine (tpst). [Ag7(tpst)4] units form nanosized rings, which share Ag atoms to one-dimensional chains (see schematic structure). anions solvent molecules are present as guests in tubes.

A series of chiral diphosphine ligands denoted as PQ-Phos was prepared by atropdiastereoselective Ullmann coupling and ring-closure reactions. The reaction the biaryl dioxides is featured highly efficient central-to-axial chirality transfer with diastereomeric excess >99%. This substrate-directed unprecedented for preparation dioxides, our method precludes tedious resolution procedures usually required preparing enantiomerically pure ligands. effect recognition also revealed in a relevant...

No destaining required: The luminescence properties of an iridium(III)–2-phenylpyridine complex can be utilized for the detection proteins in sodium dodecyl sulfate–polyacrylamide gels. Emissive gel images obtained upon staining with are visible under UV light. high sensitivity histidine-rich (right vial, compared to a non-histidine-tagged protein) suggests potential applications signaling biomolecules.

J. Wu, B. Ye, L. Wang, Ji, Zhou, R. Li and Z. Chem. Soc., Dalton Trans., 1997, 1395 DOI: 10.1039/A605269J

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Nanometer-Sized Metallosupramolecular Cube with Oh SymmetryMaochun Hong, Yingjun Zhao, Weiping Su, Rong Cao, Makoto Fujita, Zhongyuan Zhou, and Albert S. C. ChanView Author Information State Key Laboratory of Structural Chemistry Fujian Institute Research on the Structure Matter Chinese Academy Sciences, Fuzhou 350002, P. R. China Department Applied School Engineering, Nagoya University Chikusaku, 464-8603, Japan Open Chirotechnology...

A Rh(III)-catalyzed direct aromatic C–H amination is achieved using N-chloroamines as a reagent. Furthermore, we also developed one-pot protocol involving in situ chlorination of the secondary amines. The catalytic operates at mild conditions with excellent functional group tolerance and regioselectivity.

A Pd-catalyzed protocol for direct C−H bond acylation by cross coupling of aryl ketone oximes and aldehydes using tert-butyl hydroperoxide (TBHP) as oxidant was developed. With a directing group the activation, with achieved remarkable regioselectivity. The reactions exhibit excellent functional tolerance, both aliphatic heteroaromatic can be effectively coupled to oximes.

This communication describes the Pd(OAc)2-catalyzed ethoxycarbonylation reactions of aromatic C−H bonds using diethyl azodicarboxylate (DEAD) together with Oxone or K2S2O8. Substrates such as 2-arylpyridines, pyrrolidinone, acetylindoline, quinoline, and oximes were ethoxycarbonylated excellent chemo- regioselectivities. The catalytic reaction is probably initiated by chelation-assisted cyclopalladation ortho-C−H bond. Preliminary studies suggested that reactive ethoxyacyl radicals generated...

Extensive investigations of asymmetric intermolecular cyclopropanation terminal alkenes with diazoacetates catalyzed by ruthenium porphyrin [Ru(P*)(CO)(EtOH)] (1, H2P = 5,10,15,20-tetrakis[(1S,4R,5R,8S)-1,2,3,4,5,6,7,8-octahydro-1,4:5,8-dimethanoanthracene-9-yl]porphyrin) and the application catalyst 1 to intramolecular allylic or homoallylic are described. The styrene its derivatives ethyl diazoacetate afforded corresponding cyclopropyl esters in up 98% ee high trans/cis ratios 36 extremely...

Aminated adventures: The new phosphine ligand L in combination with a Pd(OAc)2 precursor provides the first palladium-catalyzed amination of unactivated aryl mesylates. This catalyst system can be applied an aqueous reaction medium without detrimental effect. Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note: publisher is responsible for...

Reactions of [Fe(TPFPP)] (TPFPP = meso-tetrakis(pentafluorophenyl)porphyrinato dianion) with diazo compounds N2C(Ph)R (R Ph, CO2Et, CO2CH2CHCH2) afforded [Fe(TPFPP)(C(Ph)R)] Ph (1), CO2Et (2), CO2CH2CHCH2 (3)) in 65−70% yields. Treatment 1 N-methylimidazole (MeIm) gave the adduct [Fe(TPFPP)(CPh2)(MeIm)] (4) 65% yield. These new iron porphyrin carbene complexes were characterized by NMR and UV−vis spectroscopy, mass spectrometry, elemental analyses. X-ray crystal structure determinations...

A Pd(OAc)2-catalyzed protocol for decarboxylative arylation of aromatic C−H bond was developed using aryl acylperoxides as inexpensive sources. Substrates containing pyridyl, oxime, and oxazoline groups undergo effectively ortho-selective with excellent functional group tolerance. This should begin by directing-group-assisted cyclopalladation, followed the reaction palladacycle radicals generated in situ thermal decomposition peroxides.

An effective method in targeting α-aryl malonates is reported. In the presence of a catalytic amount 2-picolinic acid and CuI, coupling aryl iodides with diethyl malonate proceeds smoothly even at room temperature. The high levels functional group compatibility exceptionally mild reaction conditions offer this an attractive protocol accessing variety arylated malonates.

Leicht zugänglich ist ein chiraler Iridium-(H8-Binapo)-Katalysator, der die hoch enantioselektive Hydrierung von Chinoxalinen bei hohen Substrat/Katalysator-Verhältnissen 100 bis 20 000 vermittelt. Die neue Methode dient als praktischer Ansatz für Synthese optisch aktiver Tetrahydrochinoxalin-Derivate (siehe Schema; cod=1,5-Cyclooctadien).

Abstract An efficient palladium‐catalyzed CH acylation with aldehydes using tert ‐butyl hydroperoxide (TBHP) transforms various anilides into synthetically useful 2‐aminobenzophenone derivatives under mild conditions (40 °C, 3 h). The reaction exhibits excellent regioselectivity and functional group tolerance, simple aromatic aldehydes, functionalized aliphatic heteroaromatic are effective coupling partners. is probably initiated by a rate‐limiting electrophilic cyclopalladation ( k H / D...

A novel dual-walled cage MOF with a high density of Lewis acid active sites and CO₂-philic ligands exhibits excellent CO₂ capture conversion performance under mild environmentally friendly conditions.

A series of novel chiral-bridged atropisomeric monophosphine ligands were synthesized via convenient and simple pathways. The prepared ligands, especially for ligand 7d, found to be highly effective in the Pd-catalyzed Suzuki–Miyaura coupling reaction. steric hindrance electronic effect substrates on reactivity enantioselectivity explored preliminarily.

A Rh(III)-catalyzed oxidative [4 + 1] cycloaddition of benzohydroxamic acids and α-diazoesters is achieved to afford benzolactams in up 93% yields. With the N-OAc amido moiety as a directing group, ortho-C-H selectively functionalized catalytic reaction exhibits excellent tolerance different functional substituents. notable rhodacyclic complex isolated structurally characterized, suggesting that C-H/N-H cyclometallation key step cycle.

The aurophilicity of sulfur and the bridging gold(I) centers by bis(diphenylphosphanyl)-n-propylamine (PNP) ligands result in self-assembly highly soluble high-nuclearity propeller-shaped complex [Au10(μ-PNP)4(μ3-S)4](PF6)2 (see picture), which exhibits long-lived luminescence microsecond range.

Chiral ferrocenyl heterobidentate P/S ligands bearing both central and planar chirality were prepared from (S)-Ugi's amine via a three-step modular synthesis. Through systematic screening optimization, L8 was found to be the best ligand for Pd-catalyzed asymmetric allylic alkylation of indoles with ee's up 96% being attained.

A solvated complex of alpha-H(4)SiW(12)O(40).4HMPA.2H(2)O composed the heteropolytungstate alpha-H(4)SiW(12)O(40) and organic substrate hexamethylphosphoramide (HMPA) has been synthesised, purified, characterized. The electronic spectra (lambda = 220-500 nm) as well (1)H NMR for title compound dissolved in CD(3)CN establish that this dissociates into free SiW(12)O(40)(4)(-) HMPA moieties solution unless is present very high concentrations. solid reflectance IR indicate there interaction...

A directing group-free approach for C2-selective carbenoid functionalization of NH-indoles is presented. Using [RuCl2(p-cymene)]2 as catalyst and α-aryldiazoesters source, 2-alkylated indoles were obtained in up to 96% isolated yield. Similarly, a regioselective NH-pyrroles was also achieved.

An enantioselective CO bond-forming reaction proceeds well under palladium catalysis with newly developed N–P,S ligands a ferrocene motif (see scheme). Nonconjugated substituents on the benzylic alcohol substrate lead to an increase in enantioselectivity increasing electron-donating ability title racemic 1,3-diphenyl-2-propenyl acetate. Cy = cyclohexyl. Supporting information for this article is available WWW http://www.wiley-vch.de/contents/jc_2002/2008/z703955_s.pdf or from author. Please...