Photochromic and thermochromic spiropyrans. 11. Calculation of the stabilities of the valence tautomers of spiropyrans

1980 ◽  
Vol 16 (2) ◽  
pp. 123-130
Author(s):  
B. Ya. Simkin ◽  
V. I. Minkin
Keyword(s):  
Valence Tautomers

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

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.

ChemInform Abstract: M-QUINOMETHANE: SYNTHESIS OF A COVALENT-BIRADICALOID PAIR OF VALENCE TAUTOMERS

1979 ◽  
Vol 10 (47) ◽  
Author(s):  
M. RULE ◽  
A. R. MATLIN ◽  
E. F. HILINSKI ◽  
D. A. DOUGHERTY ◽  
J. A. BERSON
Keyword(s):  
Valence Tautomers

Magnetic phase transition in valence tautomers as polymorphs of 3-iodolawsone: Single crystal X-ray structure, DSC and EPR studies

2009 ◽  
Vol 938 (1-3) ◽  
pp. 328-335 ◽  
Author(s):  
Santosh B. Zaware ◽  
Shobha Dagade-Waghmode ◽  
Rajesh G. Gonnade ◽  
Darbha Srinivas ◽  
Sandhya Y. Rane
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
X Ray ◽  
Valence Tautomers
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