Robuta

https://pubs.rsc.org/en/Content/ArticleLanding/1973/C3/C3973000127A Novel formation of polygermanes - Journal of the Chemical Society, Chemical Communications (RSC... Reaction of germylcyclopentadiene in the presence of primary or secondary amines provides a synthetic route to digermane and trigermane. chemical societynovelformationjournalcommunications