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Sulfone Derivatives (sulfone + derivative)
Selected AbstractsChemInform Abstract: Fluorinated 1-Phenyl-1H-tetrazol-5-yl Sulfone Derivatives as General Reagents for Fluoroalkylidene Synthesis.CHEMINFORM, Issue 13 2010Arun K. Ghosh 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: Synthesis of Pyrazole, Isoxazole, and Aminopyrimidine Ring-Fused Benzothiocycloheptane-Derived Oxazolidinones and Their Corresponding Sulfone Derivatives.CHEMINFORM, Issue 20 2008Vladimir Khlebnikov 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] Effects of electron-withdrawing group on the photoisomerization of tetraaryl-4H -thiopyran-1,1-dioxidesHETEROATOM CHEMISTRY, Issue 6 2008Farnaz Jafarpour Syntheses and photoisomerization of the new sulfone derivatives, 4,4-di (p-trifluoromethylphenyl)-2,6-diphenyl-4H-thiopyran-1, 1-dioxide and 4-(p-trifluoromethylphenyl)-2,4,6-triphenyl-4H-thiopyran-1,1-dioxide, have been investigated. The relative molar ratios of the photoproducts are compared with those of 2,4,4,6-tetraphenyl-4H-thiopyran-1,1-dioxide as well as electron-donating substituted 4-methyl-2,4,6-triaryl-4H-thiopyran-1,1-dioxides as model compounds under identical experimental conditions using 1H NMR spectroscopy. The results observed are discussed on the basis of a triplet excited state di-,-methane rearrangement. © 2008 Wiley Periodicals, Inc. Heteroatom Chem 19:557,561, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20455 [source] The Interplay of Inverted Redox Potentials and Aromaticity in the Oxidized States of New ,-Electron Donors: 9-(1,3-Dithiol-2-ylidene)fluorene and 9-(1,3-Dithiol-2-ylidene)thioxanthene DerivativesCHEMISTRY - A EUROPEAN JOURNAL, Issue 12 2006Samia Amriou Dr. Abstract Derivatives of 9-(1,3-dithiol-2-ylidene)fluorene (9) and 9-(1,3-dithiol-2-ylidene)thioxanthene (10) have been synthesised using Horner,Wadsworth,Emmons reactions of (1,3-dithiol-2-yl)phosphonate reagents with fluorenone and thioxanthen-9-one. X-ray crystallography, solution electrochemistry, optical spectroscopy, spectroelectrochemistry and simultaneous electrochemistry and electron paramagnetic resonance (SEEPR), combined with theoretical calculations performed at the B3P86/6-31G** level, elucidate the interplay of the electronic and structural properties in these molecules. These compounds are strong two-electron donors, and the oxidation potentials depend on the electronic structure of the oxidised state. Two, single-electron oxidations (<) were observed for 9-(1,3-dithiol-2-ylidene)fluorene systems (9). In contrast, derivatives of 9-(1,3-dithiol-2-ylidene)thioxanthene (10) display the unusual phenomenon of inverted potentials (>) resulting in a single, two-electron oxidation process. The latter is due to the aromatic structure of the thioxanthenium cation (formed on the loss of a second electron), which stabilises the dication state (102+) compared with the radical cation. This contrasts with the nonaromatic structure of the fluorenium cation of system 9. The two-electron oxidation wave in the thioxanthene derivatives is split into two separate one-electron waves in the corresponding sulfoxide and sulfone derivatives 27,29 owing to destabilisation of the dication state. [source] | ||||||||||