Indene → Tributylstannyldimethylphosphinoindene

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

150 ml of ether were introduced into a round-bottomed flask which contained 5.5 g (0.047 mol) of indene; the mixture was cooled to −20° C. 20.8 ml of a 2.3 molar solution of butyl-lithium in hexane (0.048 mol) were added to this solution in the course of 5 minutes, a yellow solution being formed. After removal of the cooling bath, the solution was warmed to room temperature and subsequently stirred for 1 hour. After the reaction mixture had been cooled to −30° C., 4.6 g of chlorodimethylphosphine (0.048 mol) in 30 ml of ether were added in the course of 20 minutes, a precipitate forming. After stirring at −20° C. for 2 hours, 20.8 ml of a 2.3 molar solution of butyl-lithium in hexane (0.048 mol) were added drop-wise. When the addition was complete, the cooling bath was removed and the solution was warmed slowly to room temperature and subsequently stirred for 1.5 hours. After the suspension had been cooled to 0° C., 15.6 g of chlorotributyltin (0.048 mol) were added dropwise. The suspension formed was warmed to room temperature and stirred for 1.5 hours. The ether was removed in vacuo and the crude product was dissolved again in hexane, the solution was filtered and the filtrate was dried in vacuo, 17.4 g of the compound 3 (yield: 78%) remaining as a heavy yellow oil. 1H NMR (400 MHz, CD2Cl2) δ 7.67 (d, J=7.5 Hz, 1 H), 7.47 (d, J=7.4 Hz, 1 H), 7.18 (m, 2 H), 6.83 (m, 1 H), 4.28 (s with Sn satellites, 1 H), 1.43-0.78 (m, 33 H). 31P NMR (161.9 MHz, CD2Cl2): δ-61.6 ppm.

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