402960-62-7Relevant academic research and scientific papers
Formation of 1,2,4-trisilacyclopentanes by photolysis of FpCH2SiR2SiR2SiR2CH2Fp (Fp = (η5-C5H5)Fe(CO)2)
Zhang, Yongqiang,Pannell, Keith H.
, p. 503 - 510 (2008/10/08)
Photolysis of FpCH2SiMe2SiMe2SiMe2CH2Fp (1), Fp = [(η5-C5H5)Fe(CO)2], resulted in almost quantitative formation of 1,1,2,2,4,4-hexamethyl-1,2,4-trisilacyclopentane (2) and Fp2. Similar treatment of FpCH2Me2SiMeSiEtSiMe2CH2Fp (6) afforded 1-ethyl-1,2,2,4,4-pentamethyl-1,2,4-trisilacyclopentane (7), indicating that the central silicon of the trisilane remains associated with the silicon-silicon bond of the product. Irradiation of FpCH2-PhMeSiSiMe2SiMe2CH2Fp (11) led to the formation of the two positional isomers (ratio 4:3), 1,1,2,2,4-heptamethyl-4-phenyl-1,2,4-trisilacyclopentane (12a) and 1,1,2,4,4-heptamethyl-2-phenyl-1,2,4-trisilacyclopentane (12b), indicating that either one of the two terminal silicon atoms of the trisilane remains in the Si-Si bond of the product while the other becomes the silicon atom of the product at 4-position. A mechanism for the formation of 1,2,4-trisilacyclopentane is suggested. Irradiation of 11 also produced a small amount the rearranged product FpPhMeSiCH2SiMe2CH2SiMe2Fp (13), whereas photochemical treatment of the tetrasilane analogue, FpCH2SiMe2SiMe2SiMe2SiMe2 CH2Fp (15), resulted in only the high-yield rearrangement product FpMe2SiCH2SiMe2SiMe2CH2Si Me2Fp (17) with an absence of elimination products.
