In the presence of catalytic amount of cesium hydroxide, the nucleophilic addition reaction of selenols to alkyne sulfurnides occurred in tetrahydrofuran at room temperature under nitrogen atmosphere to give highly regio-and stereo-selective (Z)-1-arylthio-2-arylseleno alkenes in 70%～93% yields. The mechanism involved the formation of cesium arylselenides and the nucleophilic addition to the alkynyl sulfides in the presence of cesium hydroxide. The corresponding alkenes were obtained upon hydrolysis.

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In the presence of catalytic amounts of cesium chloride, using DMF as solvent, sodium (potassium) carboxylates reacted with α-chloroacetates at room temperature or reacted with alkyl bromides (chlorides) at 60 ℃ to give the corresponding (α-alkoxyformacyl)methyl carboxylic esters and carboxylic esters in ＞90% yields. The catalytic mechanism was discussed.

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In this paper, a novel air-stable triphenylbismuth bisperfluorooctanesulfonate was synthesized by treatment of moisture-sensitive triphenylbismuth dichloride with silver bisperfluorooctanesulfonate in anhydrous CH 2 Cl 2 at room temperature. Its catalytic assessment results show that the reactions of arylamine and epoxide proceed efficiently in the presence of triphenylbismuth bisperfluorooctanesulfonates 1 (5.0 mol%) under solvent-free condition, affording β-amino alcohols in good to excellent yields. The yields of desired products do not reduce obviously after recycling for 4 times of catalyst 1. Hence, a convenient and efficient method for preparation of β-amino alcohols is provided.