1,2-Dibromoethane → 1-Chloro-1,1,2,2-tetramethyl-2-(2-methyl-1H-inden-7-yl)disilane

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Reaction Steps

To 7.97 g (0.332 mol) of magnesium turnings in 80 mL of THF a mixture of 33.4 g (0.160 mol) of 2-methyl-7-bromo-1H-indene, 30.0 g (0.160 mol) of 1,2-dibromoethane and 420 mL of THF was added dropwise with vigorous stirring at such rate that the mixture is refluxed. Further on, this mixture was additionally refluxed for 30 minutes. The obtained solution was added dropwise with vigorous stirring to a solution of 100 g (0.534 mol) of 1,2-dichloro-1,1,2,2-tetramethyldisilane in 100 mL of THF for 2 hours at room temperature (water bath cooling is required). The resulting mixture was stirred for 12 hours at ambient temperature and then evaporated to dryness. To the residue 100 mL of dry ether was added, and the obtained suspension was stirred for 20 minutes and then filtered through glass frit (G3). The precipitate was washed with 2×100 mL of ether. The combined filtrate was evaporated to dryness, the residue was dried and then rectificated in vacuum, b.p. 140° C.-145° C./1 mm Hg. Yield 26.3 g (58%) of the title product. 1H NMR (CD2Cl2): δ 7.22-7.32 (m, 3H, 4,5,6-H), 6.54 (m, 1H, 3-H), 3.39 (s, 2H, 1,1′-H), 2.21 (s, 3H, 2-Me), 0.66 (m, 3H, SiMe), 0.61 (m, 3H, SiMe), 0.59 (m, 3H, SiMe), 0.50 (m, 3H, SiMe). Anal. Calc. for C14H21ClSi2: C, 59.85; H, 7.53%. Found: C, 59.65; H, 7.72%.

Provenance & Evidence