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Carbonyl Compounds (carbonyl + compound)
Kinds of Carbonyl Compounds Terms modified by Carbonyl Compounds Selected AbstractsExperimental and Theoretical Characterization of a Triplet Boron Carbonyl Compound: BBCOCHEMPHYSCHEM, Issue 7 2003Mingfei Zhou Prof. Unusually generous donation: Matrix isolation infrared spectroscopy and quantum chemical calculations characterize the new boron carbonyl compound BBCO (see graphic), which has a linear triplet ground state (3,,). The binding energy of CO and BB is quite large, due to the back bonding usually associated with transition metal carbonyl complexes. [source] Synthesis of ,-Amino Nitriles from Carbonyl Compounds, Amines, and Trimethylsilyl Cyanide: Comparison between Catalyst-Free Conditions and the Presence of Tin Ion-Exchanged MontmorilloniteEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 9 2010Jiacheng Wang Abstract In the absence of catalysts, the three-component, one-pot synthesis of ,-amino nitriles proceeded using various aldehydes and ketones together with amines and trimethylsilyl cyanide (TMSCN) in high yields under neat conditions at room temperature. The addition order of the reagents had a significant influence on the yields of the desired ,-amino nitriles. In contrast, when tin ion-exchanged montmorillonite (Sn-Mont), prepared by the ion-exchange of sodium montmorillonite (Na-Mont) with a tin tetrachloride solution, was used as a catalyst, the reaction rates significantly increased compared with those without catalysts, and the range of the applicable carbonyl compounds was also extended: structurally diverse aromatic, aliphatic and heteroatom-containing carbonyl compounds, including sterically hindered ketones as well as aliphatic and aromatic amines, were converted into the desired ,-amino nitriles in good to excellent yields with short reaction times under mild conditions. Sn-Mont showed a better catalytic activity than proton or other metal ion-exchanged montmorillonites, supported SnO2 catalysts and the previously reported homogeneous or heterogeneous catalysts. The recovered catalyst was reused several times without loss of catalytic performance. Along with the expansion of the interlayer space of Sn-Mont, the strong Brønsted acid and Lewis acid nature of Sn-Mont derived from protons and SnO2 nanoparticles present in the interlayers of Sn-Mont likely played important and cooperative roles in the high catalytic activity. [source] Hydrosilanes Are Not Always Reducing Agents for Carbonyl Compounds, II: Ruthenium-Catalyzed Deprotection of tert -Butyl Groups in Carbamates, Carbonates, Esters, and EthersEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 6 2010Shiori Hanada Abstract Hydrosilanes act as a reagent to cleave the C,O bond of OtBu groups in carbamates, carbonates, esters, and ethers by catalysis of a triruthenium cluster. The reaction offers a novel deprotection method for OtBu groups under neutral conditions, showing unique selectivities that have never been accomplished with conventional Brønsted or Lewis acidic promoters. Possible mechanisms for C,O cleavage are discussed on the basis of NMR spectroscopic analysis. [source] Highly Shape-Selective, Biomimetic, and Efficient Deprotection of Carbonyl Compounds Masked as Ethylene Acetals or Dioxolanes Produced from 1,2-EthanediolEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 18 2003Hong-Bing Ji Abstract A simple, mild, efficient, and organic solvent-free biochemical approach for the deprotection of carbonyl compounds protected as 1,3-dioxolanes through the use of cyclodextrins as catalysts has been developed. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) [source] Rhodium Fluoroapatite Catalyzed Conjugate Addition of Arylboronic Acids to ,,, -Unsaturated Carbonyl CompoundsHELVETICA CHIMICA ACTA, Issue 10 2008Lakshmi Kantam, Mannepalli Abstract Rhodium fluoroapatite (RhFAP) is an efficient catalyst for conjugate addition of organoboron reagents to ,,, -unsaturated carbonyl compounds. A variety of arylboronic acids and ,,, -unsaturated carbonyl compounds were converted to the corresponding conjugate-addition products, demonstrating the versatility of the reaction. The reaction is highly selective. RhFAP was recovered quantitatively by simple filtration, and reused for four cycles. [source] Iridium-Catalyzed Highly Enantioselective Hydrogenation of Exocyclic ,,,-Unsaturated Carbonyl CompoundsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2010Fengtao Tian Abstract By using the iridium complex of a phosphine-oxazoline ligand with an axis-unfixed biphenyl backbone, a highly enantioselective hydrogenation of the CC bond of exocyclic ,,,-unsaturated carbonyl compounds to afford ,-chiral cyclic ketones, lactones and lactams was developed. [source] Three-Component Reactions of 2-Alkynylbenzaldoximes and ,,,-Unsaturated Carbonyl Compounds with Bromine or Iodine MonochlorideADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2010Shengqing Ye Abstract The three-component reaction of 2-alkynylbenzaldoximes and ,,,-unsaturated carbonyl compounds with bromine or iodine monochloride is described, which generates the unexpected 2-(4-haloisoquinolin-1-yl)ethanol derivatives in good to excellent yields. [source] Organocatalyzed Conjugate Addition of Carbonyl Compounds to Nitrodienes/Nitroenynes and Synthetic ApplicationsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 4 2010Sébastien Belot Abstract The purpose of this study is to point out the synthetic utility of a new class of Michael acceptors (nitrodienes and nitroenynes). The highly enantioselective organocatalytic Michael addition of carbonyl compounds to these functionalized nitroolefins has been carried out in the presence of (S)-diphenylprolinol silyl ether to achieve some interesting building blocks in high selectivities. The adducts thus obtained can be easily converted by taking advantage of the corresponding unsaturated carbon-carbon bond. In presence of the double bond, metathesis or electrophilic activation could be carried out whereas in the presence of the triple bond electrophilic activation could be conducted. We thus focused on a gold-catalyzed cyclization of the bis-homopropargylic alcohol to afford the corresponding substituted tetrahydrofuran. Then, we also demonstrated that organic and gold catalysts were compatible in a one-pot process. Indeed, we developed a one-pot enantioselective organocatalytic Michael addition to a nitroenyne followed by a gold-catalyzed acetalization/cyclization to achieve tetrahydrofuranyl ethers in high diastereo- and enantioselectivities with excellent yields. [source] A Highly Diastereoselective Tertiary Amine-Catalyzed Cascade Michael,Michael,Henry Reaction between Nitromethane, Activated Alkenes and ,,,-Unsaturated Carbonyl CompoundsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1 2010Bo Zhang Abstract A new tertiary amine-catalyzed cascade Michael,Michael,Henry reaction between nitromethane, a doubly activated alkene and an ,,,-unsaturated carbonyl compound is described, which provides a convenient and efficient synthesis for densely functionalized cyclohexanes and some bicyclic compounds in moderate to excellent yields with high diastereoselectivity. [source] Aluminium Powder-Catalyzed Regio- and Stereoselective Aminobromination of ,,,-Unsaturated Carbonyl Compounds and Simple Olefins with the p -Toluenesulfonamide/ N -Bromosuccinimide (TsNH2 -NBS) SystemADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 14-15 2009Zhan-Guo Chen Abstract The regio- and stereoselective aminobromination of ,,,-unsaturated carbonyl compounds and simple olefins catalyzed by elementary aluminium powder has been established by using p -toluenesulfonamide (TsNH2) and N -bromosuccinimide (NBS) as the nitrogen/bromine sources. The reaction was convenient to carry out with a loading of 1,mol% catalyst at room temperature without inert gas protection. This method provides an easy approach to trans vicinal haloamino derivatives of ,,,-unsaturated carbonyl compounds and simple olefins in high yields (up to 99.8%) and in excellent regio- and stereoselectivities. The electron-rich and electron-deficient olefins show significant differences in activity to the aminobromination reaction and give the opposite regioselectivities. Two possible pathways involving separately a bromonium or an aziridinium intermediate have been proposed. [source] Nanocrystalline Magnesium Oxide-Stabilized Molybdenum: An Efficient Heterogeneous Catalyst for the Aerobic Oxidation of Alcohols to Carbonyl CompoundsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 16 2008M. Lakshmi Kantam Abstract A nanocrystalline magnesium oxide-stabilized molybdenum(VI) complex catalyzed the oxidation of primary and secondary alcohols to carbonyl compounds in excellent yields using molecular oxygen as stoichiometric oxidant. The nanomaterials with their three-dimensional structure and defined size and shape act as suitable supports for metal complexes. The catalyst can be reused for four runs without any significant loss of activity. [source] A Modular Approach to ,-Arylated Carbonyl Compounds via Indium Tris(bistriflylamide)-Catalyzed Regioselective Addition of ,-Ketoesters to 1,3-DiynesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-13 2005Masaharu Nakamura Abstract A modular synthesis of ,-arylated carbonyl compounds has been achieved by the combination of an indium-catalyzed regioselective addition of ,-keto esters to conjugated diynes and a palladium-catalyzed benzannulation reaction. Indium tris(bistriflylamide), In(NTf2)3, was found to be an efficient catalyst for the first addition reaction of ,-keto esters to diynes. The reaction proceeds with perfect regioselectivity to give conjugated enynes in high yield. The second palladium-catalyzed benzannulation proceeds in high to excellent yield and with high regioselectivity for a variety of diynes. This two-step ,-arylation of carbonyl compounds thus proceeds in a catalytic manner without loss of elements in the starting materials. The reaction may be performed in a single pot without isolation of the product of the first step. [source] Regioselective Addition Reactions of Propargyl Bromides to Carbonyl Compounds with Gallium Catalyzed by IndiumADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 9 2005Ho Lee Abstract Reactions of organogallium reagents generated from propargyl bromides having substituents at the ,-position and gallium in the presence of 5,mol,% of indium with aldehydes and ketones selectively produced homoallenyl alcohols in good to excellent yields. Treatment of organogallium reagents obtained from propargyl bromide or propargyl bromides having substituents at the ,-position and gallium in the presence of 5,mol,% of indium with carbonyl compounds selectively afforded homopropargyl alcohols. [source] Silica Supported Sodium Hydrogen Sulfate and Amberlyst-15: Two Efficient Heterogeneous Catalysts for Facile Synthesis of Bis- and Tris(1H -indol-3-yl)methanes from Indoles and Carbonyl Compounds[1]ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 5 2003Chimmani Ramesh Abstract Bis- and tris(1H -indol-3-yl)methanes are synthesized in high yields by an electrophilic substitution reaction of indoles with carbonyl compounds under mild reaction conditions using two efficient heterogeneous catalysts, silica supported sodium hydrogen sulfate (NaHSO4,SiO2) and amberlyst-15. The second catalyst can be reused. [source] Selective Oxidation of Alcohols to Carbonyl Compounds and Carboxylic Acids with Platinum Group Metal CatalystsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 4 2003Ross Anderson Abstract The use of platinum group metal (PGM) catalysts for the selective oxidation of various primary and secondary alcohols under mild conditions is described. High throughput screening (HTS) techniques have been used to identify trends in catalyst activity and product selectivity. Using air as oxidant and water as solvent 5% Pt, 1% Bi/C has been identified as an efficient catalyst for the transformation of 2-octanol to 2-octanone and 1-octanol to octanoic acid. To improve aldehyde selectivity the promotion of Pt/Al2O3 and Ru/C catalysts has been investigated. The use of H2O2 as oxidant has been demonstrated as a suitable alternative to air. [source] ,-Alkylation of Carbonyl Compounds by Direct Addition of Alcohols to Enol Acetates,ANGEWANDTE CHEMIE, Issue 48 2009Yoshihiro Nishimoto Dr. A praktische ,-Alkylierung von Ketonen und Aldehyden gelingt mit der Titelreaktion. Die moderate Lewis-Acidität von InI3, GaBr3 und FeBr3 ist ein Schlüsselfaktor des Katalysezyklus, und eine Vielzahl unterschiedlicher Alkohole und Enolacetate wurde erfolgreich eingesetzt. [source] Coupling Reactions of Zirconate Complexes Induced by Carbonyl Compounds,ANGEWANDTE CHEMIE, Issue 43 2009Chanjuan Xi Prof. Facettenreiches Organozirconat: Die neuartige Kupplungsreaktion von Organozirconaten 1 mit Carbonylverbindungen (über die Zwischenstufe 2) bietet einen selektiven Zugang zu hoch substituierten Allenen 3 und Dienolen 4. [source] ChemInform Abstract: Iridium/Chiral Diene-Catalyzed Asymmetric 1,6-Addition of Arylboroxines to ,,,,,,,-Unsaturated Carbonyl Compounds.CHEMINFORM, Issue 42 2010Takahiro Nishimura Abstract The title reaction of dienones, dienamides, or a dienoate affords ,-arylated carbonyl compounds with high enantioselectivities by use of the C2 -symmetric tetrafluorobenzobarrelene-derived iridium complex IRB as catalyst. [source] ChemInform Abstract: One-Pot Reductive Amination of Carbonyl Compounds Using Sodium Borohydride,Amberlyst 15.CHEMINFORM, Issue 40 2010Heshmatollah Alinezhad Abstract The title reaction can also be carried out in THF at 25 °C with comparable yields. [source] ChemInform Abstract: Double Michael Addition of Dithiols to Acetylenic Carbonyl Compounds under the Influence of Molecular Sieve and Dimethyl Sulfoxide.CHEMINFORM, Issue 17 2010Tomoko Kakinuma 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: New Highly Efficient Aziridine-Functionalized Tridentate Sulfinyl Catalysts for Enantioselective Diethylzinc Addition to Carbonyl Compounds.CHEMINFORM, Issue 13 2010Stanislaw Lesniak 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: One-Pot, Solvent-Free Regioselective Addition Reactions of Propargyl Bromide to Carbonyl Compounds Mediated by Zn,Cu Couple.CHEMINFORM, Issue 13 2010Xiaofang Ma 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: Nucleophilic Cyclopropanation Reaction with Bis(iodozincio)methane by 1,4-Addition to ,,,-Unsaturated Carbonyl Compounds.CHEMINFORM, Issue 51 2009Kenichi Nomura 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: A New Approach to 3-Hydroxyprolinol Derivatives by Samarium Diiodide-Mediated Reductive Coupling of Chiral Nitrone with Carbonyl Compounds.CHEMINFORM, Issue 49 2009Shao-Feng Wu 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: Microwave-Assisted InCl3 -Catalyzed Meyer,Schuster Rearrangement of Propargylic Aryl Carbinols in Aqueous Media: A Green Approach to ,,,-Unsaturated Carbonyl Compounds.CHEMINFORM, Issue 48 2009Victorio Cadierno 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: One-Pot Three Components Synthesis of O-Acetylcyanohydrins with TMSCN, Acetic Anhydride and Carbonyl Compounds under Solvent-Free Condition.CHEMINFORM, Issue 46 2009Santosh T. Kadam 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: One-Portion Synthesis of 2-Acetoxy Carbonyl Compounds from Aldehydes by Using an Acetylated Masked Acyl Cyanide.CHEMINFORM, Issue 38 2009Hisao Nemoto 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: Alkali Salt of L-Proline as an Efficient and Practical Catalyst for the Cyanosilylation of a Wide Variety of Carbonyl Compounds under Solvent-Free Conditions.CHEMINFORM, Issue 32 2009Zhi-Liang Shen 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-Catalyzed Asymmetric 1,4-Addition of Heteroaryl Cyclic Triolborate to ,,,-Unsaturated Carbonyl Compounds.CHEMINFORM, Issue 31 2009Xiao-Qiang Yu 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: Catalytic Hydrosilylation of Carbonyl Compounds with Zinc(II) Acetate: Asymmetric Induction Collaborated with N2S2 Ligands.CHEMINFORM, Issue 22 2009Tomohiko Inagaki 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] | |||||||||||||||||||||||||||||||