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A large group of catalysts made by reacting a compound of a transition metal chosen from groups IV through VII of the periodic table with an alkyl, hydride, or other compound of a metal from groups I through III. A typical example is the reaction product of an aluminum alkyl with titanium tetrachloride or titanium trichcloride. These catalysts were first developed by the German scientist Karl Ziegler for the polymerization of ethylene. Subsequent work by G.Natta showed that these and similar catalysts are useful for preparing stereoregular polyolefins. Thus, the family of catalysts is sometimes called Ziegler-Natta catalysts.