Abstract Dendritic and cross-linked polyphenylenepolygermanes have been obtained by reactions of EtMgBr with (C 6 F 5) 3 GeH and (C 6 F 5) 2 GeH 2, respectively. The reaction of sodium naphthalenide with trihydride C 6 F 5 GeH 3 gives linear insoluble polymer (C 6 F 4 GeH 2) n.