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Molecular Iodine (molecular + iodine)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Molecular Iodine Mediated Preparation of Isothiocyanates from Dithiocarbamic Acid Salts

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 12 2009
Jayashree Nath
Abstract We have developed a general economical and environmentally benign method for the preparation of isothiocyanates from the corresponding dithiocarbamic acid salts by using cheap and readily available reagent molecular iodine. This is perhaps the most efficient method reported so far for the synthesis of isothiocyanates. The reagent is easily available and nontoxic, and the precipitated sulfur can be removed easily; hence, this method is most suitable for large-scale synthesis.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Ring Expansion versus Cyclization in 4-Oxoazetidine-2- carbaldehydes Catalyzed by Molecular Iodine: Experimental and Theoretical Study in Concert

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2010
Benito Alcaide
Abstract Molecular iodine (10,mol%) efficiently catalyzes the ring expansion of 4-oxoazetidine-2-carbaldehydes in the presence of tert -butyldimethylsilyl cyanide, or allylic and propargylic trimethylsilanes to afford protected 5-functionalized-3,4-dihydroxypyrrolidin-2-ones with good yield and high diastereoselectivity, through a C3C4 bond cleavage of the ,-lactam nucleus. Interestingly, in contrast to the iodine-catalyzed reactions of 3-alkoxy-,-lactam aldehydes which lead to the corresponding ,-lactam derivatives (rearrangement adducts), the reactions of 3-aryloxy-,-lactam aldehydes under similar conditions gave ,-lactam-fused chromanes (cyclization adducts) as the sole products, through exclusive electrophilic aromatic substitution involving the C3 aromatic ring and the carbaldehyde. In order to support the mechanistic proposals, theoretical studies have been performed. [source]

ChemInform Abstract: Molecular Iodine Promoted Synthesis of New Pyrazolo[3,4-d]pyrimidine Derivatives as Potential Antibacterial Agents.

CHEMINFORM, Issue 23 2010
Mehdi Bakavoli
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: The Reductive Etherification of Carbonyl Compounds Using Polymethylhydrosiloxane Activated by Molecular Iodine.

CHEMINFORM, Issue 15 2010
J. S. Yadav
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 One-Pot Preparation of Cyanamide from Dithiocarbamate Using Molecular Iodine.

CHEMINFORM, Issue 9 2010
Jayashree Nath
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: Molecular Iodine Mediated Preparation of Isothiocyanates from Dithiocarbamic Acid Salts.

CHEMINFORM, Issue 33 2009
Jayashree Nath
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: Facile Synthesis of 2-Amino-1,4-naphthoquinones Catalyzed by Molecular Iodine under Ultrasonic Irradiation.

CHEMINFORM, Issue 37 2008
Bing Liu
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: Deoxygenative Allylation of Benzyl Acetates and Cinnamyl Alcohols Catalyzed by Molecular Iodine.

CHEMINFORM, Issue 19 2008
J. S. Yadav
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]

Novel and Efficient Approach to Fluorinated ,-Aminobutanones Catalyzed by Molecular Iodine.

CHEMINFORM, Issue 32 2007
Min Xia
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]

Aerobic Photocatalytic Oxidation of Activated Benzylic and Allylic Alcohols to Carbonyl Compounds Catalyzed by Molecular Iodine.

CHEMINFORM, Issue 14 2007
Saeid Farhadi
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]

Direct Iodination of Aromatic Compounds with Polyvinylpyrrolidone Supported Hydrogen Peroxide (PVP-H2O2) and Potassium Iodide or Molecular Iodine.

CHEMINFORM, Issue 50 2006
Ali Reza Pourali
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]

Facile Oxidative Conversion of Alcohols to Esters Using Molecular Iodine.

CHEMINFORM, Issue 42 2005
Naoshi Mori
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Direct Oxidative Conversion of Primary Alcohols to Nitriles Using Molecular Iodine in Ammonia Water.

CHEMINFORM, Issue 40 2005
Naoshi Mori
No abstract is available for this article. [source]

Ring Expansion versus Cyclization in 4-Oxoazetidine-2- carbaldehydes Catalyzed by Molecular Iodine: Experimental and Theoretical Study in Concert

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 10 2010
Benito Alcaide
Abstract Molecular iodine (10,mol%) efficiently catalyzes the ring expansion of 4-oxoazetidine-2-carbaldehydes in the presence of tert -butyldimethylsilyl cyanide, or allylic and propargylic trimethylsilanes to afford protected 5-functionalized-3,4-dihydroxypyrrolidin-2-ones with good yield and high diastereoselectivity, through a C3C4 bond cleavage of the ,-lactam nucleus. Interestingly, in contrast to the iodine-catalyzed reactions of 3-alkoxy-,-lactam aldehydes which lead to the corresponding ,-lactam derivatives (rearrangement adducts), the reactions of 3-aryloxy-,-lactam aldehydes under similar conditions gave ,-lactam-fused chromanes (cyclization adducts) as the sole products, through exclusive electrophilic aromatic substitution involving the C3 aromatic ring and the carbaldehyde. In order to support the mechanistic proposals, theoretical studies have been performed. [source]

Molecular Iodine Stabilization in an Extended N···I,I···N Assembly

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 24 2009
Francesco Isaia
Abstract The adduct [bis(quinoxaline)-2,2,,3,3,-disulfide·I2], (Q2S2·I2), (1) can be easily synthesised from the reaction of Q2S2 and I2 in CH2Cl2 or, in the absence of any solvent, through diffusion of I2 vapours at 60 °C. X-ray diffraction analysis shows the presence of an extended N···I,I···N assembly in which each I2 molecule links a Q2S2 molecule at both ends through a nitrogen atom to form a polymeric species; the d(I,I) and d(N,I) bond lengths confirm a very weak nitrogen,iodine interaction at the base of the N···I,I···N assembly. DFT calculations provide optimised distances for the N···I and I,I bonds and explanation for the zigzag chain formation: the mPW1PW functional and the B3LYP hybrid functional with a variety of basis sets for the I atomic species [CRENBL, LANL2DZ, LANL2DZ(d,p), LANL08(d), SBKJC, SBKJC polarised-LFK and Stuttgart RLC] have been tested. Compound 1 proved stable up to nearly 100 °C, and the stability is to be mainly attributed to the lattice energy of its polymeric structure then to donor,acceptor stabilisation. The facile insertion of molecular iodine into the Q2S2 network makes this compound an interesting iodine sponge, suitable for I2 storage; moreover, Q2S2 can easily collect and release I2(g) by a temperature-controlled process (60 and 97 °C, respectively). (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Molecular Iodine Mediated Preparation of Isothiocyanates from Dithiocarbamic Acid Salts

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 12 2009
Jayashree Nath
Abstract We have developed a general economical and environmentally benign method for the preparation of isothiocyanates from the corresponding dithiocarbamic acid salts by using cheap and readily available reagent molecular iodine. This is perhaps the most efficient method reported so far for the synthesis of isothiocyanates. The reagent is easily available and nontoxic, and the precipitated sulfur can be removed easily; hence, this method is most suitable for large-scale synthesis.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Multi-Component Synthesis of Dihydropyrimidines by Iodine Catalyst at Ambient Temperature and in-vitro Antimycobacterial Activity

ARCHIV DER PHARMAZIE, Issue 8 2009
Paresh Zalavadiya
Abstract An efficient and simple three-component domino synthesis of some new dihydropyrimidines (DHPMs) from aromatic aldehydes, 1,3-dicarbonyl compounds and N -(3-chloro-4-fluorophenyl)urea using molecular iodine as catalyst is described. The 1-substituted dihydropyrimidines were isolated in good to excellent yields (78-90%) within a short reaction time (4-6 h) at ambient temperature. The biological evaluation revealed that the newly synthesized compounds (4a - i and 5a - i) exhibited moderate antimycobacterial activity against Mycobacterium tuberculosis H37 RV. [source]

Iodine Catalyzed Microwave-Assisted Synthesis of 14-Aryl(Alkyl)-14H -dibenzo[a,j]xanthenes

CHINESE JOURNAL OF CHEMISTRY, Issue 5 2007
Fei-Qing Ding
Abstract A straightforward and effective procedure for the synthesis of 14-aryl(alkyl)-14H -dibenzo[a,j]xanthenes was described using a catalytic amount of molecular iodine under microwave irradiation to afford the corresponding xanthenes in good yields. [source]