Silenes ⟩Si=C⟨, germenes ⟩Ge-C⟨ and stannenes ⟩Sn=C⟨ -: The French contribution

Various stable silenes drop Si=C drop, germenes drop Ge=C drop and stannenes drop Sn=C drop have been synthesized by reaction of tert-butyllithium with halovinylsilanes and -germanes (addition-elimination reactions)*. These two routes are among the most often used to synthesize stable organometallic alkenes. These derivatives, easily evidenced by their characteristic physicochemical data, are extremely reactive, much more than their alkene analogues, and appear as Fruitful synthons in organic and organometallic chemistry. (C) 1998 Elsevier Science S.A. All rights reserved.