Facile and Convergent Synthesis of Highly Fused Oligosiloles by Rhodium‐Catalyzed Stitching Reaction

One-Pot Direct Synthesis of Siloles from 1-Bromo-2-silylethynylbenzenes or 1-Bromo-4-silyl-1,3-enynes

We propose one-pot synthesis of siloles from readily available starting materials. This methodology is practical for the preparation of multisubstituted siloles in good to excellent yields with complete regioselectivity. Sequential reactions, such as lithiation, silylation, and diisobutylaluminum-hydride-promoted cyclization, enable the preparation of the siloles. This transformation provides siloles through two efficient C-Si bond formations in one vessel.

Rhodium-Catalyzed Stitching Reactions for the Facile Synthesis of Extended π-Conjugated Compounds

π-Conjugated compounds have been extensively investigated as potentially useful organic materials, however, accessible structures are currently still limited, mainly due to the lack of efficient synthetic methods. In this regard, a new synthetic strategy termed the ‘stitching reaction’ has been recently devised that allows facile access to novel types of bridged π-conjugated compounds in a convergent manner under rhodium catalysis. In addition, this synthetic strategy has been successfully applied to the preparation of π-conjugated polymers that cannot be synthesized via existing methods. Herein an overview that includes the physical properties of newly synthesized π-conjugated compounds is provided.

1 Introduction

2 Synthesis of Novel Fused Oligosiloles by the Stitching Reaction and Their Properties

3 Synthesis of Hydrocarbon-Based Fused π-Conjugated Compounds by the Stitching Reaction

4 Synthesis of New π-Conjugated Polymers by Stitching Polymerization

5 Conclusion