Synthesis 2020; 52(15): 2147-2161
DOI: 10.1055/s-0039-1690898
short review
© Georg Thieme Verlag Stuttgart · New York

Manifestation of the β-Silicon Effect in the Reactions of Unsaturated Systems Involving a 1,2-Silyl Shift

Rūdolfs Beļaunieks
,
Mikus Puriņš
,
Māris Turks
Institute of Technology of Organic Chemistry, Faculty of Materials Science and Applied Chemistry, Riga Technical University, P. Valdena str. 3, Riga, 1048, Latvia   Email: Maris.Turks@rtu.lv
› Author Affiliations
This work was supported by a grant from Latvian Council of Science (grant No. LZP-2018/1-0315) and doctoral student grant from Riga Technical University (grant No. DOK.MLKF/19).
Further Information

Publication History

Received: 31 January 2020

Accepted after revision: 30 March 2020

Publication Date:
20 April 2020 (online)


Abstract

Many chemical transformations of organosilicon compounds proceed due to the capability of silyl substituents to stabilize a positive charge in its β-position. This short review provides an overview of the present understanding of the β-silicon effect and focusses on the synthetic applications of 1,2-silyl shifts resulting from non-vertical stabilization of alkylcarbenium ions and vinyl cations. The reactions of silicon containing unsaturated starting materials, alkenes, allenes, and alkynes, involving β-silyl group stabilized cationic intermediates, transition metal carbenes, or vinylidene complexes will be discussed.

1 Introduction

2 Origins of the β-Silicon Effect

3 Reactions of Allenylsilanes

4 Reactions of Alkynes

4.1 Propargylsilanes

4.2 Alkynylsilanes

5 Reactions of Alkenes

5.1 Allylsilanes

5.2 Vinylsilanes

6 Conclusions