Chlorodimethylsilane → 7-{2-[Chloro(dimethyl)silyl]propoxy}-4-methyl-2H-1-benzopyran-2-one

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Reaction Steps

To a solution of 2.16 g of 7-allyloxy-4-methylcoumarin and 5×10-6 mols chloroplatinic acid hydrosilylation catalyst in 20 ml toluene was slowly added 2.0 g of Me2SiHCl and the mixture was heated at 40°-42° for 6 hrs. Toluene and unreacted silane were then removed at reduced pressure to yield 7{2-(chlorodimethylsilyl)propoxy}-4-methylcoumarin. The 1H-NMR spectrum (ppm) contained signals at 0.2(s) for SiCH3, (6H); 2.4(s) for CH3,(3H); 4.0(t) for CH2O, (2H) and no signal for the allyl moiety.

Provenance & Evidence