Selective Synthesis (selective + synthesis)

Distribution by Scientific Domains
Distribution within Chemistry


Selected Abstracts


ChemInform 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 2001
Isamu 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 Alkynes

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 19 2009
Lun-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 2007
David
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 Acid

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2010
Andrea 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 Perfluorooctanesulfonate

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 1 2010
Renhua 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 Cyclodehydration

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 17 2009
Kyoji 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 2009
Hiroko 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 2009
Keiji 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 2010
Akinori 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 2010
Satoshi 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 2010
Fabio 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 2010
Shijing 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 2010
Kyoji 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 2010
Pierluigi 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 2010
Chih-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 2010
Yasumasa 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 2010
Yutaka 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 2009
Wei 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 2009
Zhi-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 2009
Petr 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 2009
Zhang-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 2009
Hans 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 2009
Akira 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 2008
Dirk 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 2008
Hiroaki 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 2008
Sundae 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 2008
Ryohei 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 2008
Gergana 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 2007
Weike 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 2006
Peyman 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]