KrF excimer laser photolysis of 1,2-bis(substituted-methyl)benzenes in the presence of alkenes and acetylene; two-photon formation of o-quinodimethane and its cycloaddition with dienophiles
Ionic Liquid as Catalyst and Reaction Medium: A Simple, Convenient and Green Procedure for the Synthesis of Thioethers, Thioesters and Dithianes using an Inexpensive Ionic Liquid, [pmIm]Br
作者:Brindaban C. Ranu、Ranjan Jana
DOI:10.1002/adsc.200505122
日期:2005.11
room temperature ionicliquid, 1-pentyl-3-methylimidazolium bromide, [pmIm]Br efficiently catalyzes the reaction of alkyl halides or acyl halides with thiols without any solvent at room temperature leading to the synthesis of thioethers and thioesters in high yields. This reaction has also been extended for the preparation of dithianes and transthioetherification. The ionicliquid is recovered and
Half-Sandwich Rhodium/Iridium(III) Complexes Designed with Cp* and 1,2-Bis(phenylchalcogenomethyl)benzene as Catalysts for Transfer Hydrogenation in Glycerol
作者:Om Prakash、Kamal Nayan Sharma、Hemant Joshi、Pancham L. Gupta、Ajai K. Singh
DOI:10.1021/om500149n
日期:2014.5.27
glycerol, which acts as a solvent and hydrogen source. Complexes 1–2 are the first examples of Rh species explored for TH in glycerol. The catalysis appears to be homogeneous. The complexes of the (Se, Se) ligand are marginally efficient than the corresponding complexes of the (S, S) ligand. The reactivity of Rhcomplexes in comparison to those of Ir also appears to be somewhat more. The results of DFT
Facile Oxidation of Sulfides to Sulfoxides using Sodium Hypochlorite and Oxoammonium Salt as a Catalyst: Chemo- and Diastereoselective Transformation of Bis(phenylthio)alkanes into Sulfoxides
作者:Renata Siedlecka、Jacek Skarżewski
DOI:10.1055/s-1994-25486
日期:——
A facile and selective method for the title transformation is described. The two-phase oxidation of disulfides with one or two equivalents of sodium hypochlorite mediated by TEMPO and co-catalyzed by potassium bromide and PTC leads to the corresponding mono- or disulfoxides, respectively. In the case of 1,2- 1,3-bis(phenylthio)alkanes and ortho-bis(phenylthiomethyl)benzene the respective meso disulfoxides are formed in 90-98% diastereoselectivity.
本文介绍了一种简便且具有选择性的方法来进行上述转化。在 TEMPO 的介导以及溴化钾和四氯化碳的共同催化下,二硫化物与一或两个当量的次氯酸钠发生两相氧化反应,分别生成相应的一硫醚或二硫醚。在 1,2- 1,3-双(苯硫基)烷烃和正交双(苯硫基甲基)苯的情况下,可生成相应的中二硫醚,非对映选择性为 90-98%。
A Facile Synthesis of Tetra- and Dihydronaphthalene Derivatives by Excimer Laser Photolysis of 1,2-Bis(substituted-methyl)benzenes in the Presence of Olefins and Acetylene
作者:Akihiko Ouchi、Yoshinori Koga
DOI:10.1021/jo970953o
日期:1997.10.1
laser photolyses of 1,2-bis(phenoxymethyl)benzene (1-O), 1,2-bis[(phenylthio)methyl]benzene (1-S), and 1,2-bis[(phenylseleno)methyl]benzene (1-Se) in acetonitrile solutions via a two-photon process, which was followed by cycloaddition of 3A with several dienophiles-maleic anhydride (4a), dimethyl maleate (4b), dimethylfumarate (4c), fumaronitrile (4d), and dimethyl acetylenedicarboxylate (4e)-to give corresponding