[2σ+2σ+2π]-Cycloaddition of quadricyclane to partially methylated chlorosilylalkenes

[2 sigma+2 sigma+2 pi]-Cycloaddition of quadricyclane to trissilylated ethenes Cl3-nMenSiCH=CSiMenCl3-n(SiMe3-nCln) (n = 1, 2) at 95 degrees C affords 3,3,4-trissilylated exo-tricyclo[4.2.1.0(2,5)]non-7-enes. Tetrakis(trichlorosilyl)ethene does not react with quadricyclane.