Group IV heteroadamantanes: synthesis of Si 6 Sn 4 and site-selective derivatization of Si 6 Ge 4 .

The mixed heteroadamantanes Si 6 Ge 4 and Si 6 Sn 4 are readily accessible from Me 2 ECl 2 /Si 2 Cl 6 /cat. Cl - (4 × EMe 2 , 2 × SiCl 2 , 4 × Si-SiCl 3 vertices; E = Ge, Sn). Different from Si 6 Ge 4 , two skeletal isomers are formed in the case of Si 6 Sn 4 . Site-selective SiCl 3 -methylation of Si 6 Ge 4 was achieved, leaving the SiCl 2 groups untouched.