Synthesis and Properties of a Kinetically Stabilized 9-Silaphenanthrene#
- Norihiro Tokitoh ,
- Akihiro Shinohara ,
- Takeshi Matsumoto ,
- Takahiro Sasamori ,
- Nobuhiro Takeda , and
- Yukio Furukawa
Abstract

Reaction of 9-bromo-9,10-dihydro-9-silaphenanthrene (6) with lithium diisopropylamide (LDA) in THF at room temperature afforded kinetically stabilized 9-silaphenanthrene 1a bearing an efficient steric protection group, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt). 9-Silaphenanthrene 1a was isolated as pale yellow crystals, and the structure of 1a was completely determined by spectroscopic and X-ray crystallographic analyses. The 1H and 13C NMR chemical shifts corresponding to the 9-silaphenanthrene ring of 1a were observed in a typical aromatic region, while the central silicon atom showed the characteristic signal at 86.9 ppm in the 29Si NMR in C6D6. The 9-silaphenanthrene ring of 1a showed completely planar geometry, indicating that 9-silaphenanthrene has a delocalized 14π-electron system as an aromatic compound. In spite of its high thermal stability, 1a still has high reactivity at the 9,10-position toward small reagents such as H2O.
#
Dedicated to the late Prof. Yoshihiko Itoh.
*
Corresponding author. Tel: +81-774-38-3200. Fax: +81-774-38-3209. E-mail: [email protected]
§
Kyoto University.
†
Waseda University.
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