四(五氟苯基)卟啉铁在EtOH中催化的H 2 O 2氧化硫化物是一种有效的化学选择过程。在催化剂浓度为底物浓度的0.03-0.09%的情况下,获得的亚砜的收率通常约为分离产物的90-95%。对于乙烯基和烯丙基硫化物,未观察到环氧化。催化剂浓度为底物浓度的0.09%至0.25%,可以以几乎定量的产率获得砜,并且在亚砜的合成中观察到相同的高化学选择性。
Synthesis of Sulfoxides by the Hydrogen Peroxide Induced Oxidation of Sulfides Catalyzed by Iron Tetrakis(pentafluorophenyl)porphyrin: Scope and Chemoselectivity
The oxidation of sulfides with H2O2 catalyzed by iron tetrakis(pentafluorophenyl)porphyrin in EtOH is an efficient and chemoselective process. With a catalyst concentration 0.03−0.09% of that of the substrate, sulfoxides are obtained with yields generally around 90−95% of isolated product. With vinyl and allyl sulfides, no epoxidation is observed. With a catalyst concentration between 0.09% and 0.25%
四(五氟苯基)卟啉铁在EtOH中催化的H 2 O 2氧化硫化物是一种有效的化学选择过程。在催化剂浓度为底物浓度的0.03-0.09%的情况下,获得的亚砜的收率通常约为分离产物的90-95%。对于乙烯基和烯丙基硫化物,未观察到环氧化。催化剂浓度为底物浓度的0.09%至0.25%,可以以几乎定量的产率获得砜,并且在亚砜的合成中观察到相同的高化学选择性。
Mechanism of the oxidation of aromatic sulfides catalysed by a water soluble iron porphyrin
作者:Enrico Baciocchi、Maria Francesca Gerini、Osvaldo Lanzalunga、Andrea Lapi、Maria Grazia Lo Piparo
DOI:10.1039/b209004j
日期:2003.1.13
the oxidant. Moreover, no fragmentation products were observed in the oxidation of a benzyl phenyl sulfide whose radical cation is expected to undergo cleavage of the beta C-H and C-S bonds. These results would seem to suggest a direct oxygen atom transfer from the iron-oxo complex to the sulfide. However, competitive experiments between thioanisole (E degree = 1.49 V vs. NHE in H2O) and N,N-dimethylaniline
在水溶性铁卟啉5,10,15催化的酸性(pH 3)水性介质中,H2O2氧化H2O2氧化了许多芳基硫化物,研究了氧原子转移-电子转移(ET)机理的二分法, 20-四苯基-21H,23H-卟啉-p,p′,p″,p″′-四磺酸氯化三铁(FeTPPSCl)。在这些反应条件下,铁-氧配合物卟啉自由基阳离子P +。Fe(IV)= O应该是活性氧化剂。当研究一系列对位X取代的苯基烷基硫化物(X = OCH3,CH3,H,Br,CN)的氧化时,相应的亚砜是唯一观察到的产物,反应收率和反应性几乎不受X的性质以及烷基的体积。使用H(2)18O或H(2)18O2进行的标记实验清楚地表明,亚砜中的氧原子仅来自氧化剂。此外,在苄基苯基硫醚的氧化中未观察到任何断裂产物,该自由基的阳离子预期会发生βCH和CS键的断裂。这些结果似乎表明氧原子直接从铁-氧配合物转移至硫化物。但是,硫代苯甲醚(H2O中的E度= 1.49 V
Gold(III) catalyzed oxidation of sulfides to sulfoxides with hydrogen peroxide
作者:Yu Yuan、Yubo Bian
DOI:10.1016/j.tetlet.2007.09.146
日期:2007.11
Au(III) catalyzed oxidation of sulfides to sulfoxides with 30% hydrogenperoxide in good yields and chemoselectivities was developed. It was shown that the catalyst loading can be decreased to 0.01 mol % with the good activity and chemoselectivity. Meanwhile, the catalyst was stable in the reaction system, which can be reused at least six cycles with similar activity and chemoselectivity.
Importance of single electron-transfer in singlet oxygen reaction in aqueous solution
作者:Kenzo Inoue、Teruo Matsuura、Isao Saito
DOI:10.1016/s0040-4020(01)96590-1
日期:1985.1
phosphate buffer at pH 7.5. Control experiments indicated that the superoxide ion was formed by a direct reaction between singlet oxygen and 4. The kinetics of the trapping reaction by diphenylsulphoxide indicated the involvement of a single intermediate. The overall rate constants of the reaction of thioanisoles with singlet oxygen in methanol-water (1:1) are one order of magnitude larger than those