Organoboron Chemistry - Alkylideneboranes

Alkylideneboranes of the type RB=CRR with a boron – carbon double bond are rarely encountered. An example is borabenzene. The parent compound is HB=CH₂ which can be detected at low temperatures. A fairly stable derivative is CH₃B=C(SiMe₃)₂ but is prone to cyclodimerisation.