CCCCCCC=CCCC.[C:12]1([CH2:18][SH:19])[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.[CH2:20]([Sn:24](Cl)([CH2:29][CH2:30][CH2:31][CH3:32])[CH2:25][CH2:26][CH2:27][CH3:28])[CH2:21][CH2:22][CH3:23]>CN(C=O)C.CCCCC>[CH2:29]([Sn:24]([CH2:20][CH2:21][CH2:22][CH3:23])([CH2:25][CH2:26][CH2:27][CH3:28])[S:19][CH2:18][C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1)[CH2:30][CH2:31][CH3:32]]undec-7-ene (DBU) is added dropwise at 20° C., under argon, to a solution of benzenemethanethiol (11.72 ml; 100.0 mmol) in anhydrous DMF (20.0 ml). After 0.5 hour at 20° C., the reaction mixture is cooled to 0° C. and tributyltin chloride is added dropwise. The mixture is allowed to warm to room temperature and stirring is continued for 5 hours. The reaction mixture is taken up in pentane (400 ml), washed with water (3×300 ml) and brine (100 ml), washed with sodium sulphate, filtered and then concentrated under reduced pressure. 39.0 g of tributyl[(phenylmethyl)thio]stannane are obtained in the form of a colourless oil, which is used without further purification in the following step.
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