Isotope effects in nucleophilic substitution reactions. IV. The effect of changing a substituent at the α carbon on the structure of S<sub>N</sub>2 transition states
作者:Kenneth Charles Westaway、Zbigniew Waszczylo
DOI:10.1139/v82-360
日期:1982.10.1
Kinetic studies, secondaryα-deuterium kinetic isotopeeffects, primary chlorine kinetic isotopeeffects (1), Hammett ρ values determined by changing the substituent in the nucleophile, and activation parameters have been used to determine the detailed (relative) structures of the transition states for the SN2 reactions between para-substituted benzyl chlorides and thiophenoxide ion. A rationale for
carried out in the presence of cyclopentadiene. As a result, hetero‐Diels–Alder adducts of the thioaldehyde and the diene were formed. The treatment of a mixture of the thioformate and phenyl Grignard reagent with iodine gave 1,2‐bis(phenylsulfanyl)‐1,2‐diphenyl ethane as a product, which indicated the formation of arylsulfanyl benzylic Grignard reagents in the reaction mixture. When electrophiles were
CsF-Celite, an Efficient Solid State Reagent for the Syntheses of Thioesters and Thioethers
作者:Syed T. A. Shah、Khalid M. Khan、Hidayat Hussain、Safdar Hayat、Wolfgang Voelter
DOI:10.1007/s00706-005-0351-6
日期:2005.9
Coupling reactions of a number of aliphatic, aromatic, and heterocyclic compounds bearing an acidic hydrogen atom attached to sulfur, with alkyl, acyl, benzyl, or benzoyl halides in acetonitrile with cesium fluoride-Celite are described. This procedure is convenient, efficient, and practical for the preparation of thioethers and thioesters.
An Efficient, Mild and Intermolecular Ullmann-Type Synthesis of Thioethers Catalyzed by a Diol-Copper(I) Complex
作者:Govindasamy Sekar、D. Prasad
DOI:10.1055/s-0029-1217056
日期:2010.1
diaryl sulfides and aryl alkyl sulfides are synthesized under mild reaction conditions from the corresponding aryl iodides and aromatic/aliphatic thiols through Ullmann-type intermolecular coupling reactions in the presence of catalytic amount of easily available novel trans-9,10-dihydro-9,10-ethanoanthracene-11,12-dimethanol-copper(I) bromide complex at 82 ˚C. The catalytic system is not only capable
An alternative approach towards the syntheses of thioethers and thioesters using CsF–Celite in acetonitrile
作者:Syed Tasadaque Ali Shah、Khalid Mohammed Khan、Angelica Martinez Heinrich、Wolfgang Voelter
DOI:10.1016/s0040-4039(02)02028-2
日期:2002.11
It has been found that syntheses of thioethers and thioesters of aliphatic, aromatic and heterocyclic compounds, bearing thiol groups, can be accomplished with alkyl, acyl, benzyl or benzoyl halides in acetonitrile and cesium fluoride–Celite. In this manner, compounds like ethanethiol, 1-pentanethiol, thiophenol, 4-methoxythiophenol, 4-nitrothiophenol, and 2-mercaptobenzoxazole, 2-mercaptobenzothiazole