Home  About us  Contact
 

Thienyl Rings (thienyl + ring)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

ChemInform Abstract: An Efficient Preparation of New Homoallylamines and ,-Aminonitriles Bearing Furyl and Thienyl Rings.

CHEMINFORM, Issue 40 2008
Leonor Y. Vargas Mendez
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]

Hydrogen-bonding patterns in 3-alkyl-3-hydroxyindolin-2-ones

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 2 2010
Diana Becerra
The molecules of racemic 3-benzoylmethyl-3-hydroxyindolin-2-one, C16H13NO3, (I), are linked by a combination of N,H...O and O,H...O hydrogen bonds into a chain of centrosymmetric edge-fused R22(10) and R44(12) rings. Five monosubstituted analogues of (I), namely racemic 3-hydroxy-3-[(4-methylbenzoyl)methyl]indolin-2-one, C17H15NO3, (II), racemic 3-[(4-fluorobenzoyl)methyl]-3-hydroxyindolin-2-one, C16H12FNO3, (III), racemic 3-[(4-chlorobenzoyl)methyl]-3-hydroxyindolin-2-one, C16H12ClNO3, (IV), racemic 3-[(4-bromobenzoyl)methyl]-3-hydroxyindolin-2-one, C16H12BrNO3, (V), and racemic 3-hydroxy-3-[(4-nitrobenzoyl)methyl]indolin-2-one, C16H12N2O5, (VI), are isomorphous in space group P. In each of compounds (II),(VI), a combination of N,H...O and O,H...O hydrogen bonds generates a chain of centrosymmetric edge-fused R22(8) and R22(10) rings, and these chains are linked into sheets by an aromatic ,,, stacking interaction. No two of the structures of (II),(VI) exhibit the same combination of weak hydrogen bonds of C,H...O and C,H...,(arene) types. The molecules of racemic 3-hydroxy-3-(2-thienylcarbonylmethyl)indolin-2-one, C14H11NO3S, (VII), form hydrogen-bonded chains very similar to those in (II),(VI), but here the sheet formation depends upon a weak ,,, stacking interaction between thienyl rings. Comparisons are drawn between the crystal structures of compounds (I),(VII) and those of some recently reported analogues having no aromatic group in the side chain. [source]

3,3,4,4,5,5-Hexafluoro-1-(2-methoxyphenyl)-2-[5-(4-methoxyphenyl)-2-methyl-3-thienyl]cyclopent-1-ene: a photochromic compound

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 5 2009
Congbin Fan
The photochromic title compound, C24H18F6O2S, has thienyl and aryl substituents on the C=C double bond of the shallow half-chair-shaped cyclopentene ring. The planes of the two substituent rings are inclined to that of the cyclopentene ring, with dihedral angles between the mean plane of the cyclopentene ring and those of the phenylene and thienyl rings of 51.2,(1) and 51.3,(1)°, respectively. The molecule adopts an antiparallel conformation, with a distance between the two photoreactive C atoms of 3.717,(2),Å. [source]

Oxidative Electrochemical Switching in Dithienylcyclopentenes, Part 1: Effect of Electronic Perturbation on the Efficiency and Direction of Molecular Switching,

CHEMISTRY - A EUROPEAN JOURNAL, Issue 21 2005
Wesley R. Browne Dr.
Abstract The electro- and spectroelectrochemical properties of dithienylhexahydro- and dithienyhexafluorocyclopentenes are reported. The large effect of variation in the central cyclopentene moieties on the redox properties of the dithienylcyclopentenes is in striking contrast to the minor effect on their photochemical properties. The electronic properties of the oxidised compounds in the +1 and +2 oxidation state are reported, and the possibility of electrochemical cyclisation and cycloreversion were explored by UV/Vis spectroelectrochemistry. The efficiency of electrochemical switching is found to be dependent both on the central cyclopentene unit and on the nature of the substituents at C5 of the thienyl rings. For the hexahydrocyclopentene-based compounds oxidative ring closure of the ring-open form is observed, while for the hexafluorocyclopentene-based compounds oxidative ring opening of the ring-closed form is observed. However, the introduction of electroactive groups such as methoxyphenyl allows oxidative ring closure to occur in the hexafluoro compounds. The effect of electrolyte, solvent and temperature on the spectroelectrochemical properties were examined, and the switching process was found to be sensitive to the donor properties of the solvent/electrolyte system employed. In addition, thermally activated reversible isomerisation of the dicationic closed form was observed. The driving force for electrochemical ring opening and closure appears to be dependent on the relative stabilisation of the dicationic ring-open and ring-closed states. This study provides insight into the factors which determine the direction of cyclisation. [source]