Pentasila-1,4-diene: Homoconjugation between SiSi Double Bonds via a SiMe2 Unit
datasetposted on 19.12.2016, 00:00 by Tomoyuki Kosai, Shintaro Ishida, Takeaki Iwamoto
Although the synthesis of several bis(disilenes) has already been reported, the number of reported conjugation modes between the SiSi 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(SiSi)→π*(SiSi) 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 SiSi double bonds through the SiMe2 unit.