Structure and ring-puckering motion of the σ-localized silacyclobutane radical cation: ESR evidence
✍ Scribed by Kenji Komaguchi; Masaru Shiotani; Mitsuo Ishikawa; Kazuo Sasaki
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 599 KB
- Volume
- 200
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
The 4 K ESR spectrum of silacyclobutane radical cation in pefluorocyclohexane consists mainly of a 43 G doublet hype&e (hf ) splitting due to one equatorial hydrogen at C ( 3 ). Upon warming, the doublet spectrum is reversibly changed into a 26 G triplet due to two equivalent methylene hydrogens in the same position together with a smaller triplet of 14 G due to the -SiHz hydrogens. The temperature-dependent spectra are successfully analyzed in terms of a ring-puckering motion of the u-localized radical cation in which one of the C-Si bonds is elongated so as to give an asymmetrically distorted C, structure.