prov:value
| - where M is Si, C, Ge or Sn, preferably Si or C, and most preferably C, X is a halogen, preferably Cl or Br, and most preferably Cl, n is 0, 1, 2 or 3, and p is the valence of M. Suitable halogenating agents are methylene chloride, chloroform, carbon tetrachloride, dichlorosilane, trichlorosilane and silicon tetrachloride.
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