1976 Volume 49 Issue 12 Pages 3530-3539
Structural investigation was carried out by means of 1H-NMR, ESR, and chemical ionization mass spectrometry on the complexes formed by the reaction of alkylaluminum with titanium(IV) t-butoxide or vanadium(IV) t-butoxide as a catalyst for polymerization of isoprene. The t-butoxide was monomeric in benzene, and reduced to form a bivalent complex via trivalent ones on addition of the alkylaluminum to the solution followed by the formation of two kinds of binuclear aluminum complexes. In the trivalent state the complexes caused polymerization of isoprene to form five kinds of polymers, 1,4-polymerization of isoprene being likely caused by tris[di-μ-t-butoxo-dialkyltitanium(III)]aluminum, or the corresponding vanadium(III) complex. The final product of the reduction of vanadium(IV) t-butoxide was bis(di-μ-alkyl-dialkylaluminum)vanadium(II), which exhibits no catalytic activity.
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