Home About us Contact
|
Home About us Contact | ||
|
|
||
H Bond Activation (h + bond_activation)
Selected AbstractsArylation of Hydrocarbyl Ligands Formed from n -Alkanes through C,H Bond Activation of Benzene Using a Triruthenium ClusterEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 23 2009Makoto Moriya Abstract Triruthenium complex 2 containing a perpendicularly coordinated 1-pentyne ligand, which is one of the key intermediates of the reaction of triruthenium pentahydrido complex 1 with n -pentane, reacts with benzene to yield ,3 -benzyne,,3 -pentylidyne complex 5 by C,H bond activation. ,-H elimination form the ,3 -penytylidyne ligand occurred upon heating to yield ,3 -pentenylidene complex 6, which was followed by the formation of closo -ruthenacyclopentadiene complex 8 by the connection of the two hydrocarbyl moieties placed on each face of the triruthenium plane with partial metal,metal bond breaking. Treatment of 8 with pressurized hydrogen resulted in exclusive liberation of n -pentylbenzene, which is difficult to synthesize by conventional Friedel,Crafts alkylation. These sequential transformations correspond to the formation of linear alkylbenzene by the reaction of pentane with benzene on a trimetallic plane. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] Selective B,H versus N,H Bond Activation in Ammonia Borane by [Ir(dppm)2]OTf,EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 21 2009Andrea Rossin Abstract Ammonia borane (AB, NH3·BH3) was activated selectively on the boron hydrogen atoms by [Ir(dppm)2]OTf, as shown by variable-temperature 31P, 11B and 1H NMR studies, to yield cis - and trans -[Ir(H)2(dppm)2]OTf dihydrides. X-ray crystal structures of these complexes were obtained. DFT calculations suggest the key reaction intermediate to be a Lewis base (L) stabilised adduct, cis -[Ir(H)(BH2·L)(dppm)2]+(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] ChemInform Abstract: Structurally and Stereochemically Diverse Tetrahydropyran Synthesis Through Oxidative C,H Bond Activation.CHEMINFORM, Issue 35 2010Lei Liu Abstract In the presence of DDQ, unsaturated ethers of type (I) and (III) are found to undergo cyclization to afford tetrahydropyrans. [source] ChemInform Abstract: Highly Efficient and Versatile Synthesis of Polyarylfluorenes via Pd-Catalyzed C,H Bond Activation.CHEMINFORM, Issue 9 2010Seung Jun Hwang Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Thermal N,H Bond Activation on Anionic and Cationic Platinum Clusters: Non-Predetermined Reaction Pathways Indicate Transitions to a Bulk Surface Reactivity.CHEMINFORM, Issue 46 2009Milan Oncak Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Iron-Catalyzed Chemoselective ortho Arylation of Aryl Imines by Directed C,H Bond Activation.CHEMINFORM, Issue 33 2009Naohiko Yoshikai Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Pd-Catalyzed ortho-Arylation of 3,4-Dihydroisoquinolones via C,H Bond Activation: Synthesis of 8-Aryl-1,2,3,4-tetrahydroisoquinolinesCHEMINFORM, Issue 26 2009Junwon Kim Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Rhodium(I)-Catalyzed One-Pot Synthesis of Dialkyl Ketones from Methanol and Alkenes Through Directed sp3 C,H Bond Activation of N-Methylamine.CHEMINFORM, Issue 13 2009Eun-Ae Jo Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Ruthenium-Catalyzed Oxidative Cyanation of Tertiary Amines with Molecular Oxygen or Hydrogen Peroxide and Sodium Cyanide: sp3 C,H Bond Activation and Carbon,Carbon Bond Formation.CHEMINFORM, Issue 51 2008Shun-Ichi Murahashi Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Assisted Ruthenium-Catalyzed C,H Bond Activation: Carboxylic Acids as Cocatalysts for Generally Applicable Direct Arylations in Apolar Solvents.CHEMINFORM, Issue 42 2008Lutz Ackermann Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Alkenyl Bromides: Useful Coupling Partners for the Palladium-Catalyzed Coupling with Heteroaromatics via a C,H Bond Activation.CHEMINFORM, Issue 32 2008Aditya L. Gottumukkala Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Rh(I)-Catalyzed Arylation of Heterocycles via C,H Bond Activation: Expanded Scope Through Mechanistic Insight.CHEMINFORM, Issue 29 2008Jared C. Lewis Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Asymmetric Intramolecular Alkylation of Chiral Aromatic Imines via Catalytic C,H Bond Activation.CHEMINFORM, Issue 5 2008Anja Watzke Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Rhenium-Catalyzed Amidation of Heteroaromatic Compounds via C,H Bond Activation.CHEMINFORM, Issue 50 2007Yoichiro Kuninobu Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Suzuki,Miyaura Coupling Reaction by Pd(II)-Catalyzed Aromatic C,H Bond Activation Directed by an N-Alkyl Acetamino Group.CHEMINFORM, Issue 46 2007Zhangjie Shi Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Synthesis of Fused Imidazole Rings by Sequential van Leusen/C,H Bond Activation.CHEMINFORM, Issue 14 2007Vijaya Gracias Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Hydroalkenylation of Alkynes Catalyzed by Dinuclear Palladium Complexes via C,H Bond Activation.CHEMINFORM, Issue 10 2007Naofumi Tsukada Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Annulative Tandem Reactions Based on Pd0/tBu3P-Catalyzed Cross-Coupling and C(sp3),H Bond Activation.CHEMINFORM, Issue 31 2006Cheng-Guo Dong Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Microwave-Promoted Rhodium-Catalyzed Arylation of Heterocycles Through C,H Bond Activation.CHEMINFORM, Issue 25 2006Jared C. Lewis Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Insertion of Polar and Nonpolar Unsaturated Molecules into Carbon,Rhenium Bonds Generated by C,H Bond Activation: Synthesis of Phthalimidine and Indene Derivatives.CHEMINFORM, Issue 21 2006Yoichiro Kuninobu Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Annulation of Aromatic Imines via Directed C,H Bond Activation.CHEMINFORM, Issue 52 2005Reema K. Thalji Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Reaction for sp3,sp3 C,C Bond Formation via Cooperation of Lewis Acid-Promoted/Rh-Catalyzed C,H Bond Activation.CHEMINFORM, Issue 51 2005Lei Shi Abstract For Abstract see ChemInform Abstract in Full Text. [source] Ruthenium-Catalyzed Intermolecular Coupling Reactions of Arylamines with Ethylene and 1,3-Dienes: Mechanistic Insight on Hydroamination vs ortho-C,H Bond Activation.CHEMINFORM, Issue 42 2005Chae S. Yi Abstract For Abstract see ChemInform Abstract in Full Text. [source] Stereoselective Preparation of Dienyl Zirconocene Complexes via a Tandem Allylic C,H Bond Activation,Elimination Sequence.CHEMINFORM, Issue 10 2004Nicka Chinkov Abstract For Abstract see ChemInform Abstract in Full Text. [source] Intermolecular Coupling of Isomerizable Alkenes to Heterocycles via Rhodium-Catalyzed C,H Bond Activation.CHEMINFORM, Issue 15 2003Kian L. Tan No abstract is available for this article. [source] Palladium-Catalysed Direct C-H Activation/Arylation of Heteroaromatics: An Environmentally Attractive Access to Bi- or Polydentate LigandsEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 16 2008Fazia Derridj Abstract Bi- or polydentate ligands based on heterocycles can be easily prepared by palladium-catalysed C,H bond activation of heteroaromatics followed by heteroarylation with heteroaryl bromides. A variety of heteroaromatics such as furans, thiophenes, pyridines, thiazoles or oxazole derivatives have been employed and moderate to good yields were generally obtained using the air-stable complex [PdCl(dppb)(C3H5)] as catalyst. A range of functions such as acetyl, formyl, ester or nitrile on the heteroaromatics is tolerated.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source] Syntheses and Fluxional Processes of Diphenyl(2-thienyl)phosphane Derivatives of Triosmium ClustersEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 10 2006Nitsa K. Kiriakidou Kazemifar Abstract Thermal treatment of [Os3(CO)12] with diphenyl(2-thienyl)phosphane, Ph2P(C4H3S), results in the formation of [Os3(CO)12,x{Ph2P(C4H3S)}x] (x = 1,3, 1,3), but no C,H bond activation was observed. Reaction of [H2Os3(CO)10] with diphenyl(2-thienyl)phosphane at ambient temperature affords [HOs3(,-H)(CO)10{Ph2P(C4H3S)}] (4), but when the samereaction is repeated at elevated temperatures, the cyclometallated species [(,-H)Os3(CO)9{,3 -Ph2P(C4H2S)}] (5) and[(,-H)Os3(CO)8{,3 -Ph2P(C4H2S)}{Ph2P(C4H3S)}] (6) are formed. In addition, two more products, tentatively assigned as [(,-H)Os3(CO)6{,3 -Ph2P(C4H2S)}{,-Ph2P(C4H3S)}{Ph2P(C4H3S)}] (7) and [(,-H)Os3(CO)7{,-Ph2P(C4H2S)}{,-Ph2P(C4H3S)}{Ph2P(C4H3S)}] (8) are obtained. The dynamic behaviours of 2, 5 and 6 have been studied by variable-temperature (VT) 1H and 31P{1H} NMR spectroscopy. The VT 31P{1H} NMR spectra of [Os3(CO)10{Ph2P(C4H3S)}2] (2) demonstrate that a mixture of two isomers, which are in rapid exchange at room temperature, is present and that the less common cis - trans isomer, whose structure has been determined by X-ray crystallography, is favoured for this cluster. The VT 1H NMR spectra of 5 indicate the presence of two isomers which are proposed to arise from an oscillation of the ,,,2 -vinyl group of the thienyl moiety between two metal atoms. A similar fluxional process is proposed to occur in 6 and the assignment of the room-temperature structure(s) of this cluster was confirmed by 1H- 187Os 2D HMQC spectroscopy. In addition to 2, the solid-state structures of 3, 5 and 6 have been determined by X-ray crystallography. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source] Copper-Catalyzed Activation of Disulfides as a Key Step in the Synthesis of Benzothiazole MoietiesEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 15 2010Jakub Hyvl Abstract A convenient synthesis of substituted benzothiazoles has been accomplished by way of a copper catalyzed reaction of aromatic disulfide amines and aldehydes. The process, which involves copper catalyzed activation of disulfide functionality, proceeds in a tandem fashion via C,H bond activation, followed by aerobic oxidation of a resulting dihydrobenzothiazole intermediate. The scope and limitations of the reaction are demonstrated on a variety of substrates. [source] | ||||||||||