Abstract In order to synthesize the first seven-membered N-triflylazasilacycloalkane the reaction of triflamide with (2-bromoethyl)(3-chloropropyl) dimethylsilane was studied. Depending on the reaction conditions bis (3-chloropropyl) tetramethyldisiloxane, 3- trifluoromethylsulfonylaminopropyl (3-chloropropyl)-tetramethyldisiloxane,(2- triflamidoethyl)(3-chloropropyl) dimethylsilane, bis (3-triflamidopropyl) ...