A novel tandem reaction, including nucleophilic addition, defluorination and destannylation reactions, has been found and its application to the stereospecific synthesis of trifluorometh-ylated alkyl- and aryl vinyl ethers with exclusive formation of E-isomers in 73-96% yields is reported. An AdN -E mechanism for the tandem reaction leading to alkyl- and aryl vinyl ethers is proposed.
trifluoromethylated alkyl- and aryl vinyl ethers - nucleophilic addition - defluorination - destannylation