Pentasila-1,4-diene: Homoconjugation between Si═Si Double Bonds via a SiMe2 Unit
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- 作者：Tomoyuki Kosai ; Shintaro Ishida ; Takeaki Iwamoto
- 刊名：Journal of the American Chemical Society
- 出版年：2017
- 出版时间：January 11, 2017
- 年：2017
- 卷：139
- 期：1
- 页码：99-102
- 全文大小：337K
- ISSN：1520-5126
文摘
Although the synthesis of several bis(disilenes) has already been reported, the number of reported conjugation modes between the Si═Si double bonds remains limited. Herein, we report the properties of the stable pentasila-1,4-diene 1, which was obtained from the reaction of two equivalents of disilenide 4 with dichlorodimethylsilane. The π(Si═Si)→π*(Si═Si) absorption band of 1 is considerably broadened and red-shifted compared to those of the corresponding monodisilene and hexasila-1,5-diene, but blue-shifted relative to those of typical tetrasila-1,3-dienes. The bathochromic shift and the broadening of the absorption band in 1 should be attributed to the homoconjugation between Si═Si double bonds through the SiMe2 unit.