טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentKorogodsky Gadi
SubjectBranched Polysilyl Anions and Their Applications to the
Synthesis of Novel Silenes
DepartmentDepartment of Chemistry
Supervisor ? 18? Yitzhak Apeloig


Abstract

The first stable silene (R2C=SiR2) was synthesized only in 1981 after decades of intensive unsuccessful attempts. Even today, despite intensive research, only a few methods for the synthesis of stable silenes are known. Moreover, despite several attempts no stable bis-silene has yet been reported.

This proposal is divided into two parts, the first dealing with silyl anions (actually silyl-alkali metal reagents) which are important reagents in silicon chemistry and the second deals with the preparation of novel silenes.

We studied the following specific projects:

1. The synthesis and determination of the molecular structure of branched oligosilyl anions and of the first branched oligosilyl dianion.

2.        Determination of the solution acidity of tris-(trimethylsilyl)silane.

3.    The effect of solvent and complexation on the sila-olefination reaction between a ketone and a silyl anion.

4.    Attempts to synthesize silenes carrying long polysilicon chains.

5.     Preparation and reactivity of the first known stable bis-silenes.

6.     Synthesis of a functionalized silene.