The in situ reaction of dialkoxydichlorosilanes, such as dimethoxy-, diethoxy-, dipropoxy-, dibutoxy-, and diisobutoxydichlorosilane, with isoprene and magnesium in tetrahydrofuran (THF) was investigated. It was found that the double annelation product, i.e., 2,7-dimethyl-5-silaspiro[4.4]nona-2,7-diene (1), was obtained from diethoxy-, dipropoxy-, and dibutoxydichlorosilane in 87.0, 65.2, and 66.5% yields respectively. On the other hand, the reaction of dimethoxy- and diethoxydichlorosilane with butadiene and magnesium in THF gave 5-silaspiro[4.4]nona-2,7-diene (7) in 20.7 and 35.4% yields respectively. Several silaspirononane derivatives were synthesized from 1.
Dichlorodiethoxysilane was treated with isoprene in the presence of magnesium in THF. It was found that new silacyclopentene derivatives i.e., 1,1-diethoxy-3-methyl-1-silacyclopentene-3(1), and 2,7-dimethyl-5-silaspiro[4.4]nonadiene-2,7(2), were produced in good yields, while sodium was used instead of magnesium in the reaction 2 was obtained in a low yield.
Dichlordiäthoxy‐silan (I) reagiert mit Isopren (II) in Gegenwart von Magnesium in Tetrahydrofuran zu den beiden Addukten (III) und (IV) neben dem Tetraäthoxysilan (V).
Dialkoxydichlorsilane, die durch Umsetzen von Tetraalkoxysila‐ nen mit SiCl4 im geschlossenen Rohr bei 160°C in ca. 60%igen Ausbeuten erhältlich sind, reagieren mit Isopren (I) und Mg unter Bildung der Titelverbindung (II).
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