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Crafts Acylation (craft + acylation)
Selected AbstractsChemInform Abstract: A Novel Broensted Acid Catalyst for Friedel,Crafts Acylation.CHEMINFORM, Issue 18 2009Anna G. Posternak 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: Electrochemically Promoted Friedel,Crafts Acylation of Aromatic Compounds.CHEMINFORM, Issue 31 2008G. Karthik 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: Silica Sulfuric Acid as an Efficient Solid Acid Catalyst for Friedel,Crafts Acylation Using Anhydrides.CHEMINFORM, Issue 10 2008A. Alizadeh 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] Tf2O as a Rapid and Efficient Promoter for the Dehydrative Friedel,Crafts Acylation of Aromatic Compounds with Carboxylic Acids.CHEMINFORM, Issue 39 2007Mohammd Mehdi Khodaei 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] Highly Selective Catalytic Friedel,Crafts Acylation and Sulfonylation of Activated Aromatic Compounds Using Indium Metal.CHEMINFORM, Issue 49 2006Doo Ok Jang 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] Ytterbium(III) Trifluoromethanesulfonate Catalyzed Friedel,Crafts Acylation of 1-Methylpyrrole in Ionic Liquid.CHEMINFORM, Issue 34 2005Weike Su Abstract For Abstract see ChemInform Abstract in Full Text. [source] Aluminum Dodecatungstophosphate (AlPW12O40) as a Non-Hygroscopic Lewis Acid Catalyst for the Efficient Friedel,Crafts Acylation of Aromatic Compounds under Solvent-Less Conditions.CHEMINFORM, Issue 17 2005Habib Firouzabadi No abstract is available for this article. [source] Zinc Mediated Friedel,Crafts Acylation in Solvent-Free Conditions under Microwave Irradiation.CHEMINFORM, Issue 21 2004Satya Paul Abstract For Abstract see ChemInform Abstract in Full Text. [source] Trifluoromethanesulfonic Acid Catalyzed Friedel,Crafts Acylation of Aromatics with ,-Lactams.CHEMINFORM, Issue 10 2003Kevin W. Anderson Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: The First Intermolecular Friedel,Crafts Acylation with ,-Lactams.CHEMINFORM, Issue 25 2002Kevin W. Anderson 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] On the Functionalization of [2.2](1,4)Phenanthrenoparacyclophane,,EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 12 2007Henning Hopf Abstract Two routes for preparing functionalized [2.2](1,4)phenanthrenoparacyclophanes are described: either the parent system 2 is subjected to electrophilic substitution (bromination, Friedel,Crafts acylation, Rieche formylation: preparation of 5, 6, 7, 11 and 12) or the desired substituents are incorporated in the early stages of the synthesis by the preparation of the corresponding functionalized styryl paracyclophanes and their photocyclization to the respective phenanthrenocyclophanes. By these specific routes various bromides (22a,b), ethers (28a,c) and phenols (29a,b) were synthesized. The latter derivatives, on oxidation, furnish para - (31) and ortho -quinonophanes (30, 32, 33), useful substrates for the preparation of cyclophanes containing phenazine subunits (36). The stilbene , phenanthrene photocyclization can also be employed for the preparation of benzothiophenophanes, e.g. 43 and 44, from the respective precursors. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source] Stereoselective Total Synthesis of Xestodecalactone CHELVETICA CHIMICA ACTA, Issue 9 2009Karuturi Rajesh Abstract A simple and highly efficient stereoselective total synthesis of xestodecalactone C (IIb), a polyketide natural product, was achieved (Scheme,2). The synthesis involved Keck's asymmetric allylation, a iodine-induced electrophilic cyclization, and an intramolecular Friedel,Crafts acylation as key steps. [source] An Efficient Bismuth(III) Chloride-Catalyzed Synthesis of 1,1-Diarylalkenes via Friedel,Crafts Reaction of Acyl Chloride or Vinyl Chloride with ArenesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 14 2006Hongbin Sun Abstract In the presence of catalytic amount of bismuth(III) chloride, the reactions of acyl chlorides or vinyl chlorides with arenes afforded 1,1-diarylalkenes in 25,82,% isolated yield. In the case of the reaction of acyl chlorides with arenes, the procedure includes an initial Friedel,Crafts acylation, subsequent formation of vinyl chlorides and final Friedel,Crafts-type vinylation of another arene molecule with vinyl chloride. This paper reports the first Lewis acid-catalyzed cleavage of the CCl bond of vinyl chloride and its application in the synthesis of multiply subtituted alkenes. [source] Synthesis and properties of novel organosoluble aromatic poly(ether ketone)s containing pendant methyl groups and sulfone linkagesJOURNAL OF APPLIED POLYMER SCIENCE, Issue 1 2008Shou-Ri Sheng Abstract Several novel aromatic poly(ether ketone)s containing pendant methyl groups and sulfone linkages with inherent viscosities of 0.62,0.65 dL/g were prepared from 2-methyldiphenylether and 3-methyldiphenylether with 4,4,-bis(4-chloroformylphenoxy)diphenylsulfone and 4,4,-bis (3-chloroformylphenoxy)diphenylsulfone by electrophilic Friedel,Crafts acylation in the presence of N,N -dimethylformamide with anhydrous AlCl3 as a catalyst in 1,2-dichloroethane. These polymers, having weight-average molecular weights in the range of 57,000,71,000, were all amorphous and showed high glass-transition temperatures ranging from 160.5 to 167°C, excellent thermal stability at temperatures over 450°C in air or nitrogen, high char yields of 52,57% in nitrogen, and good solubility in CHCl3 and polar solvents such as N,N -dimethylformamide, dimethyl sulfoxide, and N -methyl-2-pyrrolidone at room temperature. All the polymers formed transparent, strong, and flexible films, with tensile strengths of 84.6,90.4 MPa, Young's moduli of 2.33,2.71 GPa, and elongations at break of 26.1,27.4%. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 [source] A remarkable difference in the deprotonation steps of the Friedel,Crafts acylation and alkylation reactionsJOURNAL OF PHYSICAL ORGANIC CHEMISTRY, Issue 11 2009Shinichi Yamabe Abstract Friedel,Crafts acylation and alkylation reactions were investigated using density functional theory calculations. The reaction systems studied were (benzene,+,acetyl chloride,+,Al2Cl6 (or AlCl3)) and (benzene,+,2-chloropropane,+,Al2Cl6). In the acylation reaction, the acylium ion intermediate is reached either via a MeC(Cl)OAl2Cl6 complex or via direct Cl transfer: MeC(O)ClAl2Cl6,,,MeCO,+Al2Cl. The ion adds to benzene electrophilically to form a Wheland intermediate containing a strong CHCl hydrogen bond, which leads to deprotonation and the subsequent formation of acetophenone. The resulting HClAl2Cl6 fragment is subjected to a nucleophilic attack by the carbonyl oxygen of the acetophenone, and recovery of the Al2Cl6 bridge is unlikely. Attack of the Al2Cl6 moiety by MeC(Cl)O gives the complex MeC(Cl)O,AlCl3, whose reactivity toward acylation is similar to that of the MeC(Cl)O,Al2Cl6 complex. In the alkylation reaction, deprotonation does not take place, but rather a [1,2] H-shift from the Wheland intermediate. The resulting , -protonated cumene undergoes deprotonation, with subsequent recovery of the Al2Cl6 bridge. In addition, the Al2Cl6 -catalyzed isomerization of the n -propyl to the isopropyl cation was found to be a dyotropic shift. Copyright © 2009 John Wiley & Sons, Ltd. [source] Synthesis and Structure of an Extremely Air-Stable Binuclear Hafnocene Perfluorooctanesulfonate Complex and Its Use in Lewis Acid-Catalyzed ReactionsCHEMISTRY - A EUROPEAN JOURNAL, Issue 26 2009Renhua Qiu Abstract Stable complexes: An extremely air-stable ,2 -hydroxy-bridged binuclear hafonocene perfluorooctanesulfoante complex shows high catalytic efficiency in Lewis acid-catalyzed reactions, such as esterification, Friedel,Crafts acylation, the Mukaiyama aldol reation, and the allylation of aldehyde (see scheme). An extremely air-stable ,2 -hydroxy-bridged binuclear hafonocene perfluorooctanesulfoante complex was successfully synthesized. This complex showed high catalytic efficiency in the esterification of alcohols, phenol, thiol, and amines, in the Friedel,Crafts acylation of alylaryl ethers, in the Mukaiyama aldol reaction, and in the allylation of aldehydes and could be reused. [source] | ||||||||||||||||||||||