Silicon‐carbon hybrid [2]‐ladderanes

Abstract

The first silicon-carbon hybrid ladderanes consisting of trisila and tricarba ladder rails were obtained by the reactions of lithium disilenide R2Si=SiRLi (R=2,4,6-triisopropylphenyl) with allylchlorosilanes. The steric strain in the 1,2,6-trisilabicyclo[2.2.0]hexanes imposed by the bulky substituents leads to highly distorted ring systems with extreme puckering and long silicon-carbon bridgehead bonds. All 1,2,6-trisilabicyclo[2.2.0]hexanes show strong absorptions in the UV/vis and the rigidity of the [2]-ladderane framework gives rise to turquoise fluorescence.