Transformations of 3-methyl- 1-butene on complex organometallic catalysts

Abstract

1. The transformation of 3-methyl-1-butene was studied and it was shown that on complex organometallic catalysts the maximum yield of poly(3-methyl-1-butene), which is equal to 3–8 g/g of Ti, and the stereoregularity of the polymer, are respectively practically independent of the nature of the catalytic system and the nature of the aluminum alkyl. 2. The catalytic activity of the various complex organometallic catalysts, determined from the values of the initial polymerization rates of 3-methyl-1-butene, correspond to the order: Al(i-C4H9)3+TiCl4 > A1(C2H5)3+TiCl4 ≈ Al(i-C4H9)3+ TiCl3 > Al(C2H5)2Cl+TiCl4. 3. The low specific yield of poly (3-methyl-1-butene) is apparently caused by the adsorption of the polymer on the catalytically active centers and the resultant diffusion inhibition of the polymerization, and also by the adsorption of 2-methyl-2-butene and 2-methy 1-1-butene, which are formed as the result of the competing isomerization reaction, on the catalytically active centers.