A Cyclic (Alkyl)(boryl)germylene Derived from a Cyclic (Alkyl)(amino)germylene

Abstract

AbstractA cyclic (alkyl)(amino)germylene undergoes a ring expansion reaction with dibromomesitylborane (MesBBr2) to afford a six‐membered dibromogermane derivative. In the presence of Lewis bases (PMe3 or MeNHC), reduction of the latter with two equivalents of potassium graphite (KC8) gives rise to cyclic (alkyl)(boryl)germylene–Lewis base adducts. Upon heating, the germylene—PMe3 adduct reacts with H2 to yield a germane, probably via a base‐free germylene featuring a small HOMO–LUMO gap.