Selenium complexes with germanium

Reaction of germylenes with elemental chalcogens (sulfur, selenium, tellurium) also allowed the synthesis of stable >Ge = E species. This was first exemplified by the isolation of terminal chalcogenido complexes of germanium 170152 and 171-173153 (Scheme 34). Stabilization in these cases is achieved by intramolecular complexation of the metal atom by Lewis bases. 

The selenium-containing complex 72b has been used to prepare a variety of new heterocycles containing both selenium and germanium. For example, reaction with dichlorodiphenylgermanium and germanium tetrachloride gives 76 and 77, respectively (Scheme 8).56... 

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