in benzene-d6 byproducts: PhH2SiSiH2Ph, PhH2SiSiHPhSiH2Ph, PhH2Si(SiHPh)2SiH2Ph; charging a NMR tube with Cp'2Zr(SiPh3)Cl and PhSiH3 in benzene-d6 under N2 or Ar, react. (3 h) under ambient room lighting conditions; 91 percent conversion; detn. by 1H-NMR;