Dichlorodimethylsilane → Chlorodimethyl(n-methyl-2-methyl-5,6-dihydroindeno[2,1-b]indol-6-yl)silane

Participants

Reaction Conditions

Reaction Steps

9.5 mL of a 2.5 M solution of n-BuLi in hexane (23.75 mmol) were added dropwise to a solution of 5.1 g of N-methyl-2-methyl-5,6-dihydroindeno[2,1-b]indole, obtained as reported above, (purity 98.2%, Mw=233.32, 21.46 mmol; indenoindole: n-BuLi=1:1.1) in 70 mL of THF, previously cooled to −78° C. At the end of the addition, the brown solution was allowed to warm up to room temperature and stirred for 6 hours. Then it was cooled again to −78° C. and added dropwise to a solution of dichlorodimethylsilane (Mw=129.06, d=1.064, 2.6 mL, 21.43 mmol; indenoindole: Me2SiCl2=1:1) in 20 mL of THF, previously cooled to −78° C. At the end of the addition, the reaction mixture was allowed to warm up to room temperature and stirred overnight. The solvents were evaporated under reduced pressure to give a brown sticky solid, which at the 1H-NMR analysis resulted to be the target product, with few by-products. The product was used in the subsequent step without further purification.

Provenance & Evidence