New heterosilocanes, 1,1-difluoroand 1-phenyl-1-fluoro-2,8-dioxa-5-chalcogenosilocanes
摘要:
The earlier unknown Si-fluorinated 2,8-dioxa-5-chalcogenosilocanes RFSi(OCH(2)CH(2))(2)Y (R = Ph, F; Y = O, S) were synthesized. According to calculations, there is a weak transannular coordinate interaction Y -> Si (Y = O, S), which is much weaker than that in the isostructural quasisilatranes (Y = N). At low temperatures, 1,1-difluoro-2,5,8-trioxasilocane forms a dimer, in which two molecules of the monomer are linked by four fluorine bridges Si-F -> Si located in pairs in the two orthogonal planes SiF(2)Si.