Home About us Contact
|
Home About us Contact | ||
|
|
||
Hypervalent Iodine (hypervalent + iodine)
Terms modified by Hypervalent Iodine Selected AbstractsVarious ,-Oxygen Functionalizations of ,-Dicarbonyl Compounds Mediated by the Hypervalent Iodine(III) Reagent p -Iodotoluene Difluoride with Different Oxygen-Containing NucleophilesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 2-3 2010Jun Yu Abstract p -Iodotoluene difluoride (p -Tol-IF2) has been found to be a general reagent for the effective introduction of various oxygen-containing functionalities including tosyloxy, mesyloxy, acetoxy, phosphoryloxy, methoxy, ethoxy and isopropoxy at the ,-position of ,-dicarbonyl compounds. These transformations can be readily realized by the use of the combined reagent of p -iodotoluene difluoride and various oxygen-containing nucleophilic compounds such as p -toluenesulfonic acid, methanesulfonic acid, acetic acid, diphenyl phosphate, methanol, ethanol and propan-2-ol under mild conditions, respectively. And, the in situ generated hypervalent iodine(III) species via ligand exchange between p -iodotoluene difluoride and the respective oxygen-containing nucleophiles are believed to be the real oxidizing agents in such transformations. [source] Titelbild: Enantioselective Kita Oxidative Spirolactonization Catalyzed by In,Situ Generated Chiral Hypervalent Iodine(III) Species (Angew. Chem.ANGEWANDTE CHEMIE, Issue 12 201012/2010) Ein konformativ flexiblesC2 -symmetrisches chirales Iodosylaren, das mit Blick auf H-Brücken- und sekundäre n-,*-Wechselwirkungen gezielt entworfen wurde, katalysiert hocheffektiv die oxidative Kita-Spirolactonisierung. Wie K.,Ishihara et,al. in der Zuschrift auf S.,2221,ff. beschreiben, wird mit dieser Katalyse eine höhere Enantioselektivität (bis 92,%,ee) erreicht als in anderen durch chirale hypervalente Iodverbindungen katalysierten Reaktionen. [source] Enantioselective Kita Oxidative Spirolactonization Catalyzed by In,Situ Generated Chiral Hypervalent Iodine(III) Species,ANGEWANDTE CHEMIE, Issue 12 2010Muhammet Uyanik Dr. Mit Iod(III) erfolgreich: Das rationale Design eines C2 -symmetrischen, chiralen Iodosylaren-Katalysators mit flexibler Konformation für die enantioselektive oxidative Kita-Spirolactonisierung beruhte auf sekundären n-,*- oder H-Brücken-Wechselwirkungen. Mes=2,4,6-Trimethylphenyl. [source] ChemInform Abstract: A Versatile and Highly Reactive Polyfluorinated Hypervalent Iodine(III) Compound.CHEMINFORM, Issue 35 2010Sascha Schaefer Abstract The new iodine compound (V)(PFIA) effectively promotes the oxidation of sulfides to sulfoxides, conversion of sulfides into sulfoximines, homocoupling of arenes, and ring closure of unsaturated acids. [source] ChemInform Abstract: A Convenient Phosphoryloxylactonization of Pentenoic Acids with Catalytic Hypervalent Iodine(III) Reagent.CHEMINFORM, Issue 34 2010Zhong-Shi Zhou Abstract Optimized conditions including iodobenzene as the catalyst in combination with MCPBA as the terminal oxidant allow the preparation of various title compounds. [source] ChemInform Abstract: Hypervalent Iodine(III)/Et4N+Br - Combination in Water for Green and Racemization-Free Aqueous Oxidation of Alcohols.CHEMINFORM, Issue 40 2009Naoko Takenaga 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 Rapid and Efficient Synthesis of Benzimidazoles Using Hypervalent Iodine as Oxidant.CHEMINFORM, Issue 26 2007Li-Hua Du 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] Synthesis of Diols Using the Hypervalent Iodine(III) Reagent, Phenyliodine(III) Bis(trifluoroacetate).CHEMINFORM, Issue 36 2006Murat Celik 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] Hypervalent Iodine in the Synthesis of Bridgehead Heterocycles: A Facile Route to the Synthesis of 6-Arylimidazo[2,1-b]thiazoles Using [Hydroxy(tosyloxy)iodo]benzene.CHEMINFORM, Issue 35 2006Ranjana Aggarwal 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] Efficient and Highly Selective Oxidation of Sulfides to Sulfoxides in the Presence of an Ionic Liquid Containing Hypervalent Iodine.CHEMINFORM, Issue 29 2006Weixing Qian 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] A Novel Synthesis of New 3-Aryl-7-methylpyrano[4,3-b]pyran-4H,5H-diones Using Hypervalent Iodine(III) Reagents.CHEMINFORM, Issue 20 2006Om Prakash 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 Oxidation of Thioureas in an Ionic Liquid by Employing an Ion-Supported Hypervalent Iodine(III) Reagent.CHEMINFORM, Issue 4 2006Weixing Qian Abstract For Abstract see ChemInform Abstract in Full Text. [source] The Synthesis of Head-to-Tail (H,T) Dimers of 3-Substituted Thiophenes by the Hypervalent Iodine(III)-Induced Oxidative Biaryl Coupling Reaction.CHEMINFORM, Issue 43 2005Toshifumi Dohi No abstract is available for this article. [source] Utilization of Hypervalent Iodine in Organic Synthesis: A Novel and Facile Two-Step Protocol for the Synthesis of New Derivatives of 1H-Imidazo[1,2-b]pyrazole by the Cyclocondensation Involving ,-Tosyloxyacetophenones.CHEMINFORM, Issue 32 2005Ming Li No abstract is available for this article. [source] Hypervalent Iodine in Synthesis: A Novel Two-Step Procedure for the Synthesis of New Derivatives of 1H-Imidazo[1,2-b]pyrazole by the Cyclocondensation Between 5-Amino-4-cyano-3-phenyl-1H-pyrazole and ,-Tosyloxyacetophenones or ,-Haloacetophenones.CHEMINFORM, Issue 30 2005Ming Li Abstract For Abstract see ChemInform Abstract in Full Text. [source] Clean and Highly Selective Oxidation of Alcohols in an Ionic Liquid by Using an Ion-Supported Hypervalent Iodine(III) Reagent.CHEMINFORM, Issue 23 2005Weixing Qian Abstract For Abstract see ChemInform Abstract in Full Text. [source] Hypervalent Iodine(III) Mediated Synthesis of 2-Substituted Benzoxazoles.CHEMINFORM, Issue 12 2005Om Prakash Abstract For Abstract see ChemInform Abstract in Full Text. [source] Hypervalent Iodine in Synthesis.CHEMINFORM, Issue 11 2004Part 93. Abstract For Abstract see ChemInform Abstract in Full Text. [source] A Novel and Direct Synthesis of Alkylated 2,2,-Bithiophene Derivatives Using a Combination of Hypervalent Iodine(III) Reagent and BF3×Et2O.CHEMINFORM, Issue 38 2003Hirofumi Tohma Abstract For Abstract see ChemInform Abstract in Full Text. [source] Hypervalent Iodine in Synthesis.CHEMINFORM, Issue 5 2003Part 73: A New Stereoselective Synthesis of 1-(1-Alkenyl) Benzotriazoles by the Reaction of Alkenyl(phenyl)iodonium Salts with Benzotriazole. Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: Hypervalent Iodine in Synthesis.CHEMINFORM, Issue 33 2002Part 75. 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: Hypervalent Iodine in Synthesis.CHEMINFORM, Issue 39 2001Part 79. 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: Hypervalent Iodine in Synthesis.CHEMINFORM, Issue 13 2001Part 67. 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: Hypervalent Iodine in Synthesis.CHEMINFORM, Issue 2 2001Part 57. 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: Hypervalent Iodine in Synthesis.CHEMINFORM, Issue 1 2001Part 56. 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] The Efficient Direct Synthesis of N,O-Acetal Compounds as Key Intermediates of Discorhabdin A: Oxidative Fragmentation Reaction of ,-Amino Acids or ,-Amino Alcohols by Using Hypervalent Iodine(III) ReagentsCHEMISTRY - A EUROPEAN JOURNAL, Issue 18 2006Yu Harayama Abstract Hypervalent iodine(III) reagents are readily available, easy to handle, and have a low toxicity and similar reactivities to those of heavy metal reagents, and hence they are used for various oxidative reactions. The oxidative cleavage of alkynes or carbonyl compounds by using bis(trifluoroacetoxy)iodo(III) pentafluorobenzene (C6F5I(OCOCF3)2) has been reported.1 Herein, the efficient direct synthesis of N,O-acetal compounds as key intermediates of discorhabdin A, by the oxidative fragmentation reaction of ,-amino acids or ,-amino alcohols by using C6F5I(OCOCF3)2, is described. [source] Various ,-Oxygen Functionalizations of ,-Dicarbonyl Compounds Mediated by the Hypervalent Iodine(III) Reagent p -Iodotoluene Difluoride with Different Oxygen-Containing NucleophilesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 2-3 2010Jun Yu Abstract p -Iodotoluene difluoride (p -Tol-IF2) has been found to be a general reagent for the effective introduction of various oxygen-containing functionalities including tosyloxy, mesyloxy, acetoxy, phosphoryloxy, methoxy, ethoxy and isopropoxy at the ,-position of ,-dicarbonyl compounds. These transformations can be readily realized by the use of the combined reagent of p -iodotoluene difluoride and various oxygen-containing nucleophilic compounds such as p -toluenesulfonic acid, methanesulfonic acid, acetic acid, diphenyl phosphate, methanol, ethanol and propan-2-ol under mild conditions, respectively. And, the in situ generated hypervalent iodine(III) species via ligand exchange between p -iodotoluene difluoride and the respective oxygen-containing nucleophiles are believed to be the real oxidizing agents in such transformations. [source] Conformational Structure and Energetics of 2-Methylphenyl(2,-methoxyphenyl)iodonium Chloride: Evidence for Solution ClustersCHEMISTRY - A EUROPEAN JOURNAL, Issue 34 2010Dr. Yong-Sok Lee Abstract Diaryliodonium salts allow the efficient incorporation of cyclotron-produced [18F]fluoride ions into electron-rich and electron-deficient arenes to provide potential radiotracers for molecular imaging in vivo with positron emission tomography (PET). This process (ArI+Ar,+18F,,Ar18F+Ar,I) is still not well understood mechanistically. To better understand this and similar reactions, it would be valuable to understand the structures of diaryliodonium salts in organic media, where the reactions are typically conducted. In this endeavor, the X-ray structure of a representative iodonium salt, 2-methylphenyl(2,-methoxyphenyl)iodonium chloride (1), was determined. Our X-ray structure analysis showed 1 to have the conformational M,P dimer as the unit cell with hypervalent iodine as a stereogenic center in each conformer. With the ab initio replica path method we constructed the inversion path between the two enantiomers of 1, thereby revealing two additional pairs of enantiomers that are likely to undergo fast interconversion in solution. Also LC,MS of 1 showed the presence of dimeric and tetrameric anion-bridged clusters in weak organic solution. This observation is consistent with the energetics of 1, both as monomeric and dimeric forms in MeCN, calculated at the B3LYP/DGDZVP level. These evidences of the existence of dimeric and higher order clusters of 1 in solution are relevant to achieve a deeper general understanding of the mechanism and outcome of reactions of diaryliodonium salts in organic media with nucleophiles, such as the [18F]fluoride ion. [source] | ||||||||||||||||||||||