Reactivity of Boryl- and Silyl-Substituted Carbenoids toward Alkynes: Insertion and Cycloaddition Chemistry

Three
modes of reactivity of phenyl-substituted alkynes toward
acyclic tetrelenes are reported, with reaction pathways found to be
dependent not only on the nature of the group 14 element but also
on the supporting ligand set. Systems featuring Sn–B or Ge–B
bonds undergo insertion chemistry, forming borane-appended (vinyl)­SnII and GeII species. With a bis­(amido)­stannylene,
phenylacetylene acts as a protic acid, generating a SnII acetylide with a unique bridged structure. Reactivity toward a more
strongly reducing SiII system is dominated by the possibility
of accessing SiIV via [2 + 1] cycloaddition chemistry.