The ‘valence tautomers’ of o-iodosobenzoic acid: the case of 4-pentyl-2-iodosobenzoic acid

1998 ◽  
pp. 1559-1560 ◽  
Author(s):  
Robert A. Moss ◽  
T. J. Emge
Keyword(s):  
Valence Tautomers ◽  
Iodosobenzoic Acid

ChemInform Abstract: The “Valence Tautomers” of o-Iodosobenzoic Acid: The Case of 4-Pentyl-2-iodosobenzoic Acid.

ChemInform ◽  
2010 ◽  
Vol 29 (47) ◽  
pp. no-no
Author(s):  
R. A. MOSS ◽  
S. VIJAYARAGHAVAN ◽  
T. J. EMGE
Keyword(s):  
Valence Tautomers ◽  
Iodosobenzoic Acid

scholarly journals Practical Synthesis of 2-Iodosobenzoic Acid (IBA) without Contamination by Hazardous 2-Iodoxybenzoic Acid (IBX) under Mild Conditions

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 1897
Author(s):  
Hideyasu China ◽  
Nami Kageyama ◽  
Hotaka Yatabe ◽  
Naoko Takenaga ◽  
Toshifumi Dohi
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Practical Method ◽  
Hypervalent Iodine ◽  
Mild Conditions ◽  
Sequential Procedures ◽  
Iodine Compounds ◽  
Practical Synthesis ◽  
Iodosobenzoic Acid ◽  
Lower Temperature

We report a convenient and practical method for the preparation of nonexplosive cyclic hypervalent iodine(III) oxidants as efficient organocatalysts and reagents for various reactions using Oxone® in aqueous solution under mild conditions at room temperature. The thus obtained 2-iodosobenzoic acids (IBAs) could be used as precursors of other cyclic organoiodine(III) derivatives by the solvolytic derivatization of the hydroxy group under mild conditions of 80 °C or lower temperature. These sequential procedures are highly reliable to selectively afford cyclic hypervalent iodine compounds in excellent yields without contamination by hazardous pentavalent iodine(III) compound.

Observation of Discrete Valence Tautomers in Crystalline Cyclopentadienyl Radicals

2021 ◽  
Author(s):  
Yannick Schulte ◽  
Blaise L. Geoghegan ◽  
Christoph Helling ◽  
Christoph Wölper ◽  
Gebhard Haberhauer ◽  
...  
Keyword(s):  
Valence Tautomers

Hypervalent iodine catalysis for selective oxidation of Baylis–Hillman adducts via in situ generation of o-iodoxybenzoic acid (IBX) from 2-iodosobenzoic acid (IBA) in the presence of oxone

2016 ◽  
Vol 40 (12) ◽  
pp. 10300-10304 ◽  
Author(s):  
Raktani Bikshapathi ◽  
Parvathaneni Sai Prathima ◽  
Vaidya Jayathirtha Rao
Keyword(s):  
Selective Oxidation ◽  
Carbonyl Compounds ◽  
Hypervalent Iodine ◽  
In Situ Generation ◽  
Iodosobenzoic Acid ◽  
High Yields

An efficient, eco-friendly protocol for selective oxidation of primary and secondary Baylis–Hillman alcohols to the corresponding carbonyl compounds in high yields has been developed with 2-iodosobenzoic acid (IBA).

Enantioselective Synthesis and Photoreactivity of a Diazirinyl-substituted (R)-β-Phenylalanine

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1088-1096 ◽  
Author(s):  
Jan-Niklas Schäckermann ◽  
Thomas Lindel
Keyword(s):  
Amino Acid ◽  
Absolute Configuration ◽  
Enantioselective Synthesis ◽  
Thermally Stable ◽  
Standard Laboratory ◽  
Laboratory Conditions ◽  
Quantumchemical Calculations ◽  
Valence Tautomers ◽  
The Absolute

Abstract The first enantioselective synthesis of a photoreactive (R)-β-phenylalanine is described. In the key step, m-diazirinyl-substituted benzaldehyde is converted to a chiral sulfinimine in a Ti(OEt)4- mediated reaction, followed by diastereoselective enolate addition. The absolute configuration of photo (R)-β-phenylalanine was confirmed by Mosher analysis. The photo amino acid proved to be thermally stable under standard laboratory conditions. Irradiation in toluene afforded cycloheptatriene=norcaradiene valence tautomers, together with carbene benzylation. Quantumchemical calculations indicate a small triplet-singlet gap.

Preparation and properties of thienyl and 2,2′-bithienyl substituted cobalt-bis(semiquinone) valence tautomers

2009 ◽  
Vol 87 (4) ◽  
pp. 533-538 ◽  
Author(s):  
Thomas J. O’Sullivan ◽  
Brandon Djukic ◽  
Paul A. Dube ◽  
Martin T. Lemaire
Keyword(s):  
Magnetic Properties ◽  
Synthesis And Characterization ◽  
Electronic And Magnetic Properties ◽  
Valence Tautomers

The synthesis and characterization of two new 2,2′-bipyridine ligands containing 3-ethynylthiophene and 3,3′-diethynyl-2,2′-bithiophene substituents is presented, along with the preparation, electronic, and magnetic properties of mono- and bimetallic cobalt-semiquinone valence tautomers containing these ligands.

The complete amino acid sequences of the b 800—850 antenna polypeptides from rhodopseudomonas acidophila strain 7750

1988 ◽  
Vol 43 (1-2) ◽  
pp. 77-83 ◽  
Author(s):  
Iwan Bissig ◽  
René A. Brunisholz ◽  
Franz Suter ◽  
Richard J. Cogdell ◽  
Herbert Zuber
Keyword(s):  
Amino Acids ◽  
Rhodobacter Capsulatus ◽  
Light Harvesting ◽  
Ion Exchange Resin ◽  
Amino Acid Sequences ◽  
Molar Ratio ◽  
Light Harvesting Complexes ◽  
Rhodopseudomonas Acidophila ◽  
Terminal Domain ◽  
Iodosobenzoic Acid

Spectrally pure B 800-850 light harvesting complexes of Rhodopseudomonas acidophila 7750 were prepared by chromatography of LDAO-solubilised photosynthetic membranes on Whatmann DE-52 ion exchange resin. Two low molecular mass polypeptides (α, β) have been isolated by organic solvent extraction of the lyophilised B 800-850 light harvesting complexes. Their primary structures were determined by liquid phase sequencer runs, by the sequence analyses of C-terminal o-iodosobenzoic acid fragments, by hydrazinolysis and by carboxypeptidase degradation. B 800-850-a consists of 53 amino acids and is 45.3% and 50.9% homologous to the B 800-850- a antenna polypeptides of Rhodobacter sphaeroides and Rhodobacter capsulatus, respectively. The second very short polypeptide (B800-850-β, 41 amino acids) is 61.0% and 56.1% homologous to the corresponding polypeptides of Rb. sphaeroides and Rb. capsulatus. The molar ratio of the two polypeptides is about 1:1. Both polypeptides show a hydrophilic N-terminal domain, a very hydrophobic central domain and a short C-terminal domain. In both polypeptides the typical His residues, identified in all antenna polypeptides of purple nonsulphur bacteria as possible bacteriochlorophyll binding sites, were found

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