[CH3:1][N:2]([CH2:4][CH2:5][CH2:6][N:7]1[CH:11]=[CH:10][N:9]=[CH:8]1)[CH3:3].[Li]CCCC.[CH2:17]([Sn:21](Cl)([CH2:26][CH2:27][CH2:28][CH3:29])[CH2:22][CH2:23][CH2:24][CH3:25])[CH2:18][CH2:19][CH3:20]>C1COCC1>[CH3:1][N:2]([CH2:4][CH2:5][CH2:6][N:7]1[CH:11]=[CH:10][N:9]=[C:8]1[Sn:21]([CH2:22][CH2:23][CH2:24][CH3:25])([CH2:26][CH2:27][CH2:28][CH3:29])[CH2:17][CH2:18][CH2:19][CH3:20])[CH3:3]1-(N,N-Dimethylaminopropyl) imidazole (2 g) in THF (20 ml) at −78° C. was treated with nBuLi (8.6 ml, 1.6 M) under nitrogen. After 30 minutes at −78° C., tri-n-butylstannyl chloride was added and the mixture allowed to warm to 20° C. The mixture was concentrated in vacuo, taken up in n-hexane and filtered. The filtrate was concentrated in vacuo to give the title compound (4.33 g) as a yellow oil; δH CDCl3 7.28 (1H, s), 7.09 (1H, s), 3.97 (2H, t), 2.25 (2H, t), 2.20(6H, s), 1.90 (2H, m) 1.55 (6H, m), 1.34 (12H, m), 0.92 (9H, m).
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