prov:value
| - anium tetrachloride), and a low valence metal selected from the group consisting of alkali metals, beryllium, magnesium, zinc, cadmium, mercury, aluminum, gallium, indium and thallium, for example magnesium, ethyl bromide and titanium tetrachloride, as such or with the addition of metallic aluminum; (c) A Group IV metal halide, for example titanium tetrachloride, and a metal identified in (b), for
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