Synthesis and characterization of some organo-all-tin dendrimers with different peripheral substituents

The first all-tin-dendrimer Sn[(CH2)4SnPh3]4 is prepared by complete hydrostannation of tetra(but-3-enyl)stannane with Ph3SnH. Selective cleavage of one phenyl group from each dendron with HCl yields Sn[(CH2)4Sn(Cl)Ph2]4 which is the starting compound for the synthesis of Sn[(CH2)4Sn(X)Ph2]4 (X=H, C5H5, Co(CO)4, Fe(CO)2C5H5, Mn(CO)5.