A novel one-pot procedure for the synthesis of stable dioxadiazastannepines and dioxadiazasilepines

A novel synthetic approach to seven-membered silicon- and tin-containing heterocycles has been developed. 5,6-Diaryl-1,3,4,7,2-dioxadiazastannepines 3a–l and 5,6-diaryl-1,3,4,7,2-dioxadiazasilepines 4a–l were prepared in one pot from vicinal dioximes 1a–d and diorganodichlorostannanes and diorganodichlorosilanes via dianion intermediate 2 in good yields.