Abstract: The synthesis of a series of halogen-substituted sila-and germacyclopentadienes (I) is described. A survey of the reactionsof these compounds shows that the ring structureoften provokes a reactivity not expectedon the basis of analogy with acyclic silanes and germanes. The formation of anions derived from I is discussed, and equilibrium experiments (reaction 14) indicate that pentaphenylgermole (XIII) is at least 106 times ...
