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Thiophene is considered to be aromatic, although theoretical calculations suggest that the degree of aromaticity is less than that of benzene. The "electron pairs" on sulfur are significantly delocalized in the pi electron system. As a consequence of its aromaticity, thiophene does not exhibit the properties seen for conventional sulfides. For ...
Thiophenol is an organosulfur compound with the formula C 6 H 5 SH, sometimes abbreviated as PhSH. This foul-smelling colorless liquid is the simplest aromatic thiol.The chemical structures of thiophenol and its derivatives are analogous to phenols, where the oxygen atom in the hydroxyl group (-OH) bonded to the aromatic ring in phenol is replaced by a sulfur atom.
[1] [2] Thieno[2,3-b]thiophene was the first member of the series to be isolated. It was obtained in very low yield upon heating citric acid, a source of a six-carbon linear chain, with P 4 S 10. [3] More efficient syntheses of this and the other two stable thienothiophenes involve cyclization reactions of substituted thiophenes. [1]
Because of their aromatic character, they are non-nucleophilic. The nonbonding electrons on sulfur are delocalized into the π-system. As a consequence, thiophene exhibits few properties expected for a sulfide – thiophene is non-nucleophilic at sulfur and, in fact, is sweet-smelling.
Osteosarcoma: This can be external, just on the jaw bone, and not involve the mouth at all. Without having the tumor aspirated and the cells examined under a microscope, this is the most likely ...
Another example is aromatic rings, where a phenyl-C 6 H 5 ring can often be replaced by a different aromatic ring such as thiophene or naphthalene which may improve efficacy, change specificity of binding or reduce metabolically labile sites on the molecule, resulting in better pharmacokinetic properties. Alloxanthine is an inhibitor of ...
The identity of the victim will not be released until next-of-kin is reached. Shortly after 9 a.m., the Army base, formerly known as Fort Gordon, issued a lockdown and echoed that message through ...
DALLAS — The home of Tyler Seguin, a longtime Dallas Stars leader and seven-time NHL All-Star, was burglarized last month. This is the second burglary of a high-profile athlete in North Texas ...