[C:1]1([CH:11]([P:20]([O:25]CC)(=[O:24])[O:21]CC)[P:12]([O:17]CC)(=[S:16])[O:13]CC)[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1.C[Si](Br)(C)C>>[C:1]1([CH:11]([P:20]([OH:24])(=[O:21])[OH:25])[P:12]([OH:13])(=[S:16])[OH:17])[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[CH:4]=[CH:3][CH:2]=1Following the same method as described in Example 2, 6.70 g (15 mmol) of tetraethyl 1-naphthylthiomethanediphosphonate was treated with trimethylsilyl bromide, and then hydrolyzed to obtain 3.92 g of the title compound as white crystals. The yield was 78%.
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