Abstract
The formation of new π-bonded germanium intermediates with dicoordinated phosphorus atoms, germaphosphimines [R 22GePR′], has been observed in the exchange reaction between 2,5-disilaphospholanes and dialkyldihalogenogermanes. These transient species have been clearly characterized by insertion and ring expansion reactions on ethylene oxide and sulfide with formation of new heterocycles 2-germa-3-oxyphospholanes and 2-germa-3-thiophospholanes.
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