Reactivity of Ar'GeGeAr' (Ar' = C_6H_3-2,6-Dipp_2, Dipp = C_6H_3-2,6-iPr_2) toward Alkynes: Isolation of a Stable Digermacyclobutadiene

摘要

Strained rings incorporating heavier group 14 elements have attracted considerable attention in recent years due to their unique structures and reaction patterns.1 Several three- and four-membered rings with heavier main group elements have been synthesized and characterized. However, stable cyclobutadiene rings containing Si-Pb atoms remain unknown, although in a few cases they have been postulated as reactive intermediates.