Development of novel key reagent for synthesis of multiple bond of heavier group main group elements.

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The author wishes to describe control of reactivity of tri- and tetraanions containing group 14 atom in the mild condition. When a chemical reaction is to be carried out selectively at one (two or three) site in a multifunctional compound, other reactive sites must be temporarily blocked. I design a new type of element, which has a several protective groups on the atom. A number of anion is easy to control depend on the kind of reagents or trigger groups on the element. We can easy to create new four bonds on the element. The strategy might be applicable for synthesis of more intricate doubly-bonded systems such as heaver analogues of vinyllithium and 1,1-dilithio-dimetalene containing group 14 elements.