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Selective Synthesis (selective + synthesis)
Selected AbstractsChemInform Abstract: Direct and Selective Syntheses of ,,,-Dichloroethyl Ketones or Their Ethyl Trimethylsilyl Mixed Acetals by the Reactions of Methoxymethyl or Ethyl Carboxylates with 1,1-Dichloroethyllithium in the Presence of Chlorotrimethylsilane.CHEMINFORM, Issue 3 2001Isamu Shiina 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] Gold(I) Catalysis: Selective Synthesis of Six- or Seven-Membered Heterocycles from Epoxy AlkynesEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 19 2009Lun-Zhi Dai Abstract Gold(I)-catalyzed intramolecular cycloisomerization of ketone-substituted epoxides with alkynes to six- or seven-membered heterocyclic compounds is firstly introduced in this paper. This procedure involves a cascade isomerization of the ketone-substituted epoxides into 1,3-diketones in the presence of a Lewis acid and subsequent gold(I)-catalyzed selective intramolecular addition of an oxygen or a carbon nucleophile to the alkynes. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] Facile and Selective Synthesis of 4-Methyl- and 4-Phenylthiosemicarbazide (=N -Methyl- and N -Phenylhydrazinecarbothioamide) Derivatives of Benzil (=1,2-Diphenylethane-1,2-dione)HELVETICA CHIMICA ACTA, Issue 11 2007David Abstract A selective synthesis of 4-methylthiosemicarbazide (=N -methylhydrazinecarbothioamide; 4a) derivatives by reaction with benzil (=1,2-diphenylethane-1,2-dione; 3) is described. The reaction conditions determined the condensation product formed. The most important factor was the acid used: in the presence of conc. HCl solution, the open-chain 2,:,1 compound 1a was exclusively obtained, whereas in the presence of 2M HCl, the cyclic 1,:,1 condensation product 2a was formed. The alcohol used, the presence of H2O, and the time of heating were additional crucial factors. The new cyclic compound 2a with a MeO group was exclusively formed when working under high-dilution conditions. The reaction with the 4-phenyl derivative 4b gave new cyclic compounds as the major products under all conditions used (Scheme). [source] Selective Synthesis of 1,4-Dialkylbenzenes from Terephthalic AcidADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2010Andrea Bramborg Abstract Terephthalic acid reacts with alkyl halides under Birch conditions to substituted 1,4-cyclohexadienes in high yields and good stereoselectivities. Electrophiles containing ester or nitrile groups undergo a surprising fragmentation under the reaction conditions. Subsequent treatment with chlorosulfonic acid proceeds by an interesting tandem decarbonylation/decarboxylation, affording 1,4-dialkylbenzenes in excellent regioselectivity. Thus our new method is superior to classical Friedel,Crafts alkylations. [source] Highly Efficient and Selective Synthesis of (E)-,,,-Unsaturated Ketones by Crossed Condensation of Ketones and Aldehydes Catalyzed by an Air-Stable Cationic Organobismuth PerfluorooctanesulfonateADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1 2010Renhua Qiu Abstract An air-stable cationic organobismuth perfluorooctanesulfonate possessing both acidic and basic characters was synthesized, and showed high catalytic activity, diastereoselectivity, stability, and reusability in the one-pot synthesis of (E)-,,,-unsaturated ketones through highly selective crossed condensation of ketones and aldehydes in water. [source] Iridium-Catalyzed Selective Synthesis of 4-Substituted Benzofurans and Indoles via Directed CyclodehydrationADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 17 2009Kyoji Tsuchikama Abstract A directed cyclization-dehydration cascade of ,-aryloxy ketones and ,-arylamino ketones was efficiently catalyzed by a cationic iridium-BINAP complex, which afforded various types of 4-substituted benzofurans and indoles in high yields with complete regioselectivity. The newly developed protocol also enabled the enantioselective preparation of chiral 4-acetyloxindole using a chiral iridium catalyst. [source] Selective Synthesis of [12]Cycloparaphenylene,ANGEWANDTE CHEMIE, Issue 33 2009Hiroko Takaba Den Gürtel enger schnallen: [12]Cycloparaphenylen, das Wandsegment einer Kohlenstoffnanoröhre (siehe Bild), wurde mithilfe wiederholter palladiumkatalysierter Kupplungsreaktionen selektiv synthetisiert. Die Synthese profitiert von der Fähigkeit der cis -1,4-Dihydroxycyclohexan-1,4-diyl-Einheit, dem Aufbau von Spannungsenergie während der Makrocyclisierung entgegenzuwirken. [source] Hydrogen-Bond Control in Axially Chiral Styrenes: Selective Synthesis of Enantiomerically Pure C2 -Symmetric Paracyclophanes,ANGEWANDTE CHEMIE, Issue 31 2009Keiji Mori Dr. Problem gelöst: Eine H-Brücke zwischen einem Phenol- und einem Sulfinyl-O-Atom kann zu axialer Chiralität eines Styrolderivats führen. In einer C2 -symmetrischen Vorstufe mit zwei solchen Sulfinylstyrolmotiven und einem gemeinsamen Diphenolring lässt sich stereoselektiv eine überbrückende Kette synthetisieren (siehe Schema). Auf diesem Weg ist eine Vielzahl an enantiomerenreinen [10]- und [12]Paracyclophanen mit Benzol- oder Naphthalingerüst zugänglich. [source] ChemInform Abstract: Radical Additions of Arenethiols to Ynamides for the Selective Synthesis of N-[(Z)-2-(Arylsulfanyl)-1-alkenyl]amides.CHEMINFORM, Issue 32 2010Akinori Sato Abstract Arenethiols undergo highly regio- and stereoselective radical addition to ynamides to furnish the title arylsulfanyl-alkenylamides. [source] ChemInform Abstract: A New Aspect of Nickel-Catalyzed Grignard Cross-Coupling Reactions: Selective Synthesis, Structure, and Catalytic Behavior of a T-Shape Three-Coordinate Nickel(I) Chloride Bearing a Bulky NHC Ligand.CHEMINFORM, Issue 29 2010Satoshi Miyazaki 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: Palladium-Catalyzed Direct Arylation of 4-Chromanones: Selective Synthesis of Racemic Isoflavanones and 3,3-Diaryl-4-chromanones.CHEMINFORM, Issue 27 2010Fabio Bellina 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 Novel Solution-Phase Approach to Nanocrystalline Niobates: Selective Synthesis of Sr0.4H1.2Nb2O6 ·H2O Nanopolyhedrons and SrNb2O6 Nanorods Photocatalysts.CHEMINFORM, Issue 20 2010Shijing Liang 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: Iridium-Catalyzed Selective Synthesis of 4-Substituted Benzofurans and Indoles via Directed Cyclodehydration.CHEMINFORM, Issue 14 2010Kyoji Tsuchikama 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: Selective Synthesis of Unsaturated N-Acylethanolamines by Lipase-Catalyzed N-Acylation of Ethanolamine with Unsaturated Fatty Acids.CHEMINFORM, Issue 7 2010Pierluigi Plastina 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: Microwave-Assisted Cycloadditions of 2-Alkynylbenzonitriles with Sodium Azide: Selective Synthesis of Tetrazolo[5,1-a]pyridines and 4,5-Disubstituted-2H-1,2,3-triazoles.CHEMINFORM, Issue 4 2010Chih-Wei Tsai 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: Selective Synthesis of N-Aryl Hydroxylamines by the Hydrogenation of Nitroaromatics Using Supported Platinum Catalysts.CHEMINFORM, Issue 3 2010Yasumasa Takenaka 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: Cesium Salt-Catalyzed Addition of Diphenyl Dichalcogenides to Alkynes: Selective Synthesis of Bis- and Mono(phenylchalcogeno)alkenes.CHEMINFORM, Issue 2 2010Yutaka Nishiyama 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: AgNO3 -Catalyzed Cyclization of Propargyl-Meldrum,s Acids in Aqueous Solvent: Highly Selective Synthesis of Z-,-Alkylidene Lactones.CHEMINFORM, Issue 52 2009Wei Jia 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: Electrophilic ipso-Halocyclization of N-Arylpropynamides with Polyfluoroalkyl Alcohols: Selective Synthesis of 8-(Polyfluoroalkoxy)azaspiro[4.5]trienes.CHEMINFORM, Issue 32 2009Zhi-Qiang Wang 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: An Efficient and Highly Selective Synthesis of (Z)-Fluoroenol Phosphates from Hydroxy Difluorophosphonates.CHEMINFORM, Issue 32 2009Petr Beier 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: Hydrothiolation of Terminal Alkynes with Diaryl Disulfides and Diphenyl Diselenide: Selective Synthesis of (Z)-1-Alkenyl Sulfides and Selenides.CHEMINFORM, Issue 12 2009Zhang-Lin Wang 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: Selective Synthesis of 2-Substituted Pyridine N-Oxides via Directed ortho-Metallation Using Grignard Reagents.CHEMINFORM, Issue 10 2009Hans Andersson 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: Selective Synthesis of Cyclic Phosphoric Acid Diesters Through Oxorhenium(VII)-Catalyzed Dehydrative Condensation of Phosphoric Acid with Alcohols.CHEMINFORM, Issue 10 2009Akira Sakakura 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: N-Dealkylation of Aliphatic Amines and Selective Synthesis of Monoalkylated Aryl Amines.CHEMINFORM, Issue 45 2008Dirk Hollmann 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: Selective Synthesis of ,-Substituted ,-Keto Esters from Aldehydes and Diazoesters on Mesoporous Silica Catalysts.CHEMINFORM, Issue 45 2008Hiroaki Murata 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: Cyclization of Allenyne-1,6-diols Catalyzed by Gold and Silver Salts: An Efficient Selective Synthesis of Dihydrofuran and Furan Derivatives.CHEMINFORM, Issue 27 2008Sundae 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: Selective Synthesis of Secondary and Tertiary Amines by Cp*Iridium-Catalyzed Multialkylation of Ammonium Salts with Alcohols.CHEMINFORM, Issue 26 2008Ryohei Yamaguchi 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: Selective Synthesis of Diastereomeric Fluorinated Octadeca-2,4-dienoates and Octadeca-2,4-dien-1-ols.CHEMINFORM, Issue 25 2008Gergana S. Nikolova 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] A General and Efficient Method for the Selective Synthesis of ,-Hydroxy Sulfides and ,-Hydroxy Sulfoxides Catalyzed by Gallium(III) Triflate.CHEMINFORM, Issue 42 2007Weike Su 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] Selective Synthesis of 2-Aryl-1-arylmethyl-1H-1,3-benzimidazoles in Water at Ambient Temperature.CHEMINFORM, Issue 30 2006Peyman Salehi 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] | ||||||||||||||||||||||||||||