Fluorous Surface‐Active Distannoxane Catalysts

Abstract

Abstract:Fluorous distannoxanes (XR f 2 SnOSnR f 2 X) 2 ·n H 2 O (R f = C 6 F 13 C 2 H 4 ) (1: X= C 8 F 17 SO 3 , n = 10; 4: X= Cl, n = 0) (1) catalyze the Mukaiyama aldol reaction and the allylation of aldehydes with tetraallyltin at room temperature in fluorous/organic biphasic solvent systems, in which the reactions proceed more rapidly than in a single organic or fluorous solvent. Due to the unique surface activity of 1, the catalyst, organic substrate(s), and reagent(s) are distributed in both organic and fluorous phases to facilitate smooth reactions. Upon dilution with toluene after the reaction, the catalyst concentrates to the fluorous phase, while the organic substances migrate to the organic phase to effect facile catalyst recovery and recycling. By virtue of such a unique solvophilicity, a new version of fluorous biphase technology has been developed.

Supramolecular Signatures of Adenine-Containing Organostannoxane Assemblies

“…The use of triorganotin hydrides in organic synthesis is well documented . There have also been several reports on the use of organooxotin compounds as catalysts particularly in esterification reactions …”