ArC(CH 3 )(SO 2 Ph)OMs 和 α-溴亚硫酸盐 ArC(CH 3 )(SO 2 Ph)Br 的溶剂解脱甲磺酸盐的练习曲。L'ordre de reactiverelative lors de la solvolyse des substrats du type p-CH 3 C 6 H 4 C(CH 3 )BrE, ou E est un groupe electronegatif, est COPh>PO(OEt) 2 >CN>SOPh>CF 3 >SO 2 Ph
In order to obtain information concerning the reaction mechanism of the pyrolysis of a sulfoxidebearing an electron-withdrawing substituent on the β-position in the S-ethyl group of ethyl phenyl sulfoxide, 2-(substituted phenyl)ethyl aryl sulfoxides(1) and 2-cyanoethyl (substituted phenyl) sulfoxides(2) were pyrolyzed. The rate-enhancing effect of the β-phenyl group of 1 was small. The activation
Efficient and Selective Sulfoxidation by Hydrogen Peroxide, Using a Recyclable Flavin−[BMIm]PF<sub>6</sub> Catalytic System
作者:Auri A. Lindén、Mikael Johansson、Nina Hermanns、Jan-E. Bäckvall
DOI:10.1021/jo060274q
日期:2006.5.1
A new flavin catalyst 2 immobilized in an ionic liquid ([BMIm]PF6) was used for the highly selective oxidation of sulfides to sulfoxides by hydrogenperoxide. The sulfoxides were obtained in good to high yields and high selectivity without any detectable overoxidation to sulfone. The catalyst in the ionic liquid was recycled up to seven times without loss of activity or selectivity.
carbonyl-substituted (arylsulfinyl)methylradicals is presented, based on experimental results and semiempirical calculations. The influence of dipole-dipole interactions, allylic 1,3-strain (A1,3 strain), allylic 1,2-strain (A1,2 strain), and coulombic interactions is discussed based on stereoselectivities observed with (alkoxycarbonyl)-, cyano-, and aryl-substituted (arylsulfinyl)methylradicals. In the second part
Reaction of singlet oxygen with some benzylic sulfides
作者:Sergio M. Bonesi、Maurizio Fagnoni、Sandra Monti、Angelo Albini
DOI:10.1016/j.tet.2006.07.110
日期:2006.11
Product distribution, total quenching rate (kT), and rate of chemical reaction (kr) with singlet oxygen have been determined for some alkyl, benzyl, α-methylbenzyl, and cumyl sulfides. Their contributions depend on the steric hindering around the sulfur atom. In protic solvents, the sulfoxide is the main product via a hydrogen-bonded persulfoxide. In apolar solvents, intramolecular α-H abstraction
Carbon–sulphur bond cleavage in the reaction of benzyl and t-butyl sulphoxides with N-halogenosuccinimides
作者:F. Jung、T. Durst
DOI:10.1039/c39730000004
日期:——
Benzyl and t-butyl alkyl or aryl sulphoxides react with NBS or NCS in CHCI3–ethanol (1%) at 25° to give benzyl or t-butyl halides and ethyl esters of alkyl or aryl sulphinic acids.