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Bond Formation (bond + formation)
Kinds of Bond Formation Selected AbstractsUtilization of the Versatility of Sulfur in C,C Bond Formation and Cleavage: Synthesis of ABC Taxoid SkeletonsEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 20 2007Subhash P. Chavan Abstract A practical and convenient five-step protocol is described to access the ABC ring system of Taxol by utilizing the versatility of the sulfur atom in its various oxidation states viz., condensation/Pummerer cyclization/coupling/annulation/fragmentation. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source] Synthesis of Enantiopure 1- r -Aryl-2- c,5- t -diphenylphospholane Oxides and Boranes by Pd-Catalyzed C,P Bond FormationEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 3 2006Martial Toffano Abstract New chiral enantiopure phospholane oxides 1 and boranes 5 were obtained from efficient carbon,phosphorus bond formation by organocuprate or palladium-catalyzed reactions. C,P cross-coupling reactions between chiral phosphane oxide 3 or borane 4 and various aryl derivatives are presented.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006) [source] Pronounced Catalytic Effect of a Micellar Solution of Sodium Dodecyl Sulfate (SDS) on the Efficient C-S Bond Formation via an Odorless Thia-Michael Addition Reaction through the in situ Generation of S -Alkylisothiouronium SaltsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 5 2009Habib Firouzabadi Abstract A pronounced catalytic effect of sodium dodecyl sulfate (SDS) was observed on the in situ production of S -alkylisothiouronium salts via the reaction of primary, allyl and benzyl halides with thiourea in SDS droplets .Hydrolysis of the generated S -alkylisothiouronium salts in the palisade layer of the droplets produces the corresponding thiol moieties which are immediately added to the electron-deficient olefins that are present in the micellar core to produce the thia-Michael adducts. The entire route is an almost odorless process. The yields of the products are good to excellent and the method is applicable to large-scale operation without any problem. [source] Cover Picture: The Proto-Ribosome: An Ancient Nano-machine for Peptide Bond Formation (Isr. J. Chem.ISRAEL JOURNAL OF CHEMISTRY, Issue 1 20101/2010) The cover picture shows the ribosome 50S subunit on a fungal background. Represented fungi, Clitopilus scyphoides, produce antibiotics of the pleuromutilin family. Pleuromutilins ,moving" into the ribosome Peptidyl Binding Centre (PTC) are also shown. The figure was contributed by Anat Bashan and Ada Yonath (see The Proto-Ribosome: An Ancient Nano-machine for Peptide Bond Formation, Davidovich et al., p. 29 in this issue). [source] Air-Stable and Highly Active Dendritic Phosphine Oxide- Stabilized Palladium Nanoparticles: Preparation, Characterization and Applications in the Carbon-Carbon Bond Formation and Hydrogenation ReactionsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 6 2008Lei Wu Abstract Dendrimer-stabilized palladium nanoparticles were formed in the reduction of palldium bis(acetylacetonate) [Pd(acac)2] in the presence of phosphine dendrimer ligands using hydrogen in tetrahydrofuran. The resulting Pd nanoparticles were characterized by TEM, 31P,NMR and 31P MAS NMR. The results indicated that the dendritic phosphine ligands were oxidized to phosphine oxides. These dendrimer-stabilized Pd nanoparticles were demonstrated to be efficient catalysts for Suzuki and Stille coupling reactions and hydrogenations. The dendritic wedges served as a stabilizer for keeping the nanoparticles from aggregating, and as a vehicle for facilitating the separation and/or the recycling of the Pd catalyst. In the case of the Suzuki coupling reaction, these Pd nanoparticles exhibited high catalytic efficiency (TON up to 65,000) and air stability as compared with the commonly used homogeneous catalyst tetrakis(triphenylphosphine)palladium [Pd(PPh3)4]. In addition, the results obtained from the bulky dendritic substrate suggest that the Pd nanoparticles might act as reservoir of catalytically active species, and that the reaction is actually catalyzed by the soluble Pd(0) and/or Pd(II) species leached from the nanoparticle surface. [source] N -Acyliminium Ion Chemistry: Highly Efficient and Versatile Carbon,Carbon Bond Formation by Nucleophilic Substitution of Hydroxy Groups Catalyzed by Sn(NTf2)4ANGEWANDTE CHEMIE, Issue 4 2010Othman Dr., Raja Ben Atomökonomisch: Nichtmodifizierte N,O-Halbacetale wurden in einer katalytischen, hocheffizienten ,-Amidoalkylierung kohlenstoffzentrierter Nucleophile eingesetzt, darunter Siliciumverbindungen, aktive Methylenderivate, elektronenreiche Arene und selbst einfache Ketone (siehe Schema). In der Regel genügt 1,Mol-% des supersauren Lewis-Reagens Sn(NTf2)4 als Katalysator. [source] Regioselective Carbon,Carbon Bond Formation in Proteins with Palladium Catalysis; New Protein Chemistry by Organometallic ChemistryCHEMBIOCHEM, Issue 1 2006Koichiro Kodama Abstract Palladium-catalyzed reactions have contributed to the advancement of many areas of organic chemistry, in particular, the synthesis of organic compounds such as natural products and polymeric materials. In this study, we have used a Mizoroki,Heck reaction for site-specific carbon,carbon bond formation in the Ras protein. This was performed by the following two steps: 1) the His6 -fused Ras protein containing 4-iodo- L -phenylalanine at position 32 (iF32-Ras-His) was prepared by genetic engineering and 2) the aryl iodide group on the iF32-Ras-His was coupled with vinylated biotin in the presence of a palladium catalyst. The biotinylation was confirmed by Western blotting and liquid chromatography,mass spectrometry (LC-MS). The regioselectivity of the Mizoroki,Heck reaction was furthermore confirmed by LC-MS/MS analysis. However, in addition to the biotinylated product (bF32-Ras-His), a dehalogenated product (F32-Ras-His) was detected by LC-MS/MS. This dehalogenation resulted from the undesired termination of the Mizoroki,Heck reaction due to steric and electrostatic hindrance around residue 32. The biotinylated Ras showed binding activity for the Ras-binding domain as its downstream target, Raf-1, with no sign of decomposition. This study is the first report of an application of organometallic chemistry in protein chemistry. [source] ChemInform Abstract: Intramolecular Fe(II)-Catalyzed N,O or N,N Bond Formation from Aryl Azides.CHEMINFORM, Issue 42 2010Benjamin J. Stokes No abstract is available for this article. [source] ChemInform Abstract: An Effective C,C Double Bond Formation via Cu(I)-Catalyzed Dehydrogation.CHEMINFORM, Issue 29 2010Thomas A. Ramirez 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: A Facile C,N Bond Formation: One-Pot Reaction of Phenols and Amines via Smiles Rearrangement.CHEMINFORM, Issue 25 2010Hao Yang 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: N-Acyliminium Ion Chemistry: Highly Efficient and Versatile Carbon,Carbon Bond Formation by Nucleophilic Substitution of Hydroxy Groups Catalyzed by Sn(NTf2)4.CHEMINFORM, Issue 21 2010Raja Ben Othman 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: Ligand-Free CuCl-Catalyzed C,N Bond Formation in Aqueous Media.CHEMINFORM, Issue 19 2010Hua-Jian Xu 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: Catalytic Carbon,Sulfur Bond Formation by Amphoteric Vanadyl Triflate: Exploring with Thia-Michael Addition, Thioacetalization, and Transthioacetalization Reactions.CHEMINFORM, Issue 11 2010Chien-Tien Chen 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: Stereoselective Synthesis of ,-Alkyl-,-keto Imides via Asymmetric Redox C,C Bond Formation Between ,-Alkyl-,-diazocarbonyl Compounds and Aldehydes.CHEMINFORM, Issue 2 2010Takuya Hashimoto 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: Mono-, Bis- and Tris-piperidine Fused Imidazolinium Salts: Their in situ Catalytic Applications for C,C Bond Formation in Aqueous SolutionsCHEMINFORM, Issue 2 2010Hayati Tuerkmen 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: Oxidative C,C Bond Formation (Scholl Reaction) with DDQ as an Efficient and Easily Recyclable Oxidant.CHEMINFORM, Issue 48 2009Linyi Zhai 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: Air-Tolerant C,C Bond Formation via Organometallic Ruthenium Catalysis: Diverse Catalytic Pathways Involving (C5Me5)Ru or (C5H5)Ru Are Robust to Molecular Oxygen.CHEMINFORM, Issue 45 2009Lukas Severa 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: Air-Tolerant C,C Bond Formation via Organometallic Ruthenium Catalysis: Diverse Catalytic Pathways Involving (C5Me5)Ru or (C5H5)Ru Are Robust to Molecular Oxygen.CHEMINFORM, Issue 45 2009Lukas Severa 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: Lipase-Catalyzed Direct Mannich Reaction in Water: Utilization of Biocatalytic Promiscuity for C,C Bond Formation in a "One-Pot" Synthesis.CHEMINFORM, Issue 45 2009Kun Li 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: Copper-Catalyzed Synthesis of Benzoxazoles via a Regioselective C,H Functionalization/C,O Bond Formation under an Air Atmosphere.CHEMINFORM, Issue 43 2009Satoshi Ueda 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: Platinum-Catalyzed Consecutive C,N Bond Formation-[1,3] Shift of Carbamoyl and Ester Groups.CHEMINFORM, Issue 33 2009Itaru Nakamura 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: Unprecedented SnCl2×2H2O-Mediated Intramolecular Cyclization of Nitroarenes via C,N Bond Formation: A New Entry to the Synthesis of Cryptotackieine (XII) and Related Skeletons.CHEMINFORM, Issue 11 2009Sunil Sharma 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: Electron-Rich, Bicyclic Biaryl-Like KITPHOS Monophosphines via [4 + 2] Cycloaddition Between 1-Alkynylphosphine Oxides and Anthracene: Highly Efficient Ligands for Palladium-Catalyzed C,N and C,C Bond Formation.CHEMINFORM, Issue 52 2008Simon Doherty 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: Functionalizing Glycine Derivatives by Direct C,C Bond Formation.CHEMINFORM, Issue 51 2008Liang Zhao 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: Benzylic C,H Activation and C,O Bond Formation via Aryl to Benzylic 1,4-Palladium Migrations.CHEMINFORM, Issue 43 2008Tanay Kesharwani 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: Palladium-Catalyzed Domino Intramolecular N-Arylation/Intermolecular C,C Bond Formation for the Synthesis of Functionalized Benzodiazepinediones.CHEMINFORM, Issue 31 2008Angela Salcedo 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: Auto-Tandem Catalysis: Synthesis of Substituted 11H-Indolo[3,2-c]quinolines via Palladium-Catalyzed Intermolecular C,N and Intramolecular C,C Bond Formation.CHEMINFORM, Issue 27 2008Caroline Meyers 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: Palladium-Catalyzed Intramolecular C,O Bond Formation: An Approach to the Synthesis of Chiral Benzodioxocines.CHEMINFORM, Issue 21 2008Arpita Neogi 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: Synthesis of ,,,-Unsaturated Ketones from Acid Chlorides Through Carbon,Pentamethylcyclopentadienyl Bond Formation and Cleavage.CHEMINFORM, Issue 15 2008Minoru Uemura 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. 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