Preparation of a stable germaethene Ge=C .2. Production, reactivity and thermal stabilization of germaethene Me(2)Ge=C(GeMe(3))(SiMe(t)Bu(2))

Thermolysis of (t)Bu(2)SiF-CLi(GeMe(3))(2) . 2THF (1) at 100 degrees C in benzene and the presence of propene, butadiene, 2,3-dimethylbutadiene or isobutene leads to ene reaction products and/or [4 + 2] cycloadducts of the germaethene Me(2)Ge=C(GeMe(3))(SiMe(t)Bu(2)) (4). The formation of these trapping products proves the intermediate existence of 4. Over and above that, it indicates that the equilibrium (t)Bu(2)Si=C(GeMe(3))(2) (3) reversible arrow 4 lies at the side of 4. Thermolysis of 1 at 100 degrees C in benzene without traps leads to many substances. Among others, in the first thermolysis step isobutene is formed by a retroene reaction.