Polarity and structure of eight-membered organosilicon compounds with planar fragments

For the first time is determined the polarity of eight-membered silocyns with planar fragments. By the methods of dipole moments and theoretical calculations (DFT B3LYP/6-31G*) of 1,3,2-dioxasilocyns is established that in these compounds occurs the conformational equilibrium of the forms bath-chair and distorted bath with the predominance of the first, in this case the bonds C( sp 3 )-S and C( sp 3 )-H of the exocyclic MeSCH 2 group are in the not eclipsed gauche orientation relative to each other.