Germylenes kinetically stabilized

A variety of preparation methods are known for transient germanium-chalcogen double bond species some of them seemed to be useful also for the synthesis of kinetically stabilized systems. Indeed, the reaction of a germylene with an appropriate chalcogen source was found to be one of the most versatile and general methods for the synthesis of stable germanium-containing heavy ketones (Scheme 21). 

The reaction of kinetically stabilized germylenes with metal complexes has proven a useful and not surprising route to complexes containing a metal-germanium double bond. Thus, the reaction of germylenes containing bulky aryl groups with the metal carbonyls... 

The fert-butyl group is known as one of the most effective kinetic protectors and many reactive molecules have been stabilized and even isolated by using this group. For example, the divalent center of silylenes and germylenes, the heavy atom analogues of carbenes, have been shown to be blocked by tcrt-butyl groups. 

---