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Under an argon atmosphere, to a solution of 13.9 g (69.5 mmol) of 2-bromo-4,6-dimethylaniline in 200 ml of THF, 27.9 ml of 2.5 M (69.5 mmol) nBuLi in hexanes were added at −50° C. This mixture was stirred for 2 hours at ambient temperature. The resulting solution was added dropwise over ca. 1 hour, while vigorously stirring, to a solution of 15.0 g (69.5 mmol) of chloro(dimethyl)(2,3,4,5-tetramethyl-2,4-cyclopentadien-1-yl)silane in 100 ml of THF at 0° C. The resulting mixture was stirred overnight at ambient temperature, then, evaporated to dryness. To the residue 100 ml of toluene were added. This mixture was filtered through a glass frit (G4). The filtrate was evaporated to dryness. Fractional distillation gave a yellow liquid, bp 180-184° C./0.5 mm Hg. Yield 20.1 g (77%).

1. additionThe resulting solution was added dropwise over ca. 1 hour
2. stirringThe resulting mixture was stirred overnight at ambient temperature
3. customevaporated to dryness
4. additionTo the residue 100 ml of toluene were added
5. filtrationThis mixture was filtered through a glass frit (G4)
6. customThe filtrate was evaporated to dryness
7. distillationFractional distillation
8. customgave a yellow liquid, bp 180-184° C./0.5 mm Hg