METAL COMPLEXES IN CATALYTIC TRANSFORMATIONS OF OLEFINS. 6. MECHANISM OF FORMATION AND CHARACTERISTICS OF THE PRECURSORS OF ACTIVE CENTERS OF ETHYLENE DIMERIZATION TO BUTENE-1 IN THE Ti(O-n-Bu)4-AlEt3 SYSTEM IN ETHERS

Article abstract of DOI:10.1007/BF00864175

Reaction of Ti(O-n-Bu)4 (TBT) with AlR3 (R = Me, Et, i-Bu) in solvents such as R2O, Py, and Et3N, reduces Ti(IV) to Ti(III), Ti(II), or Ti(I).The organotitanium compounds formed by the reaction of TBT with organoaluminum compounds (OAC) undergo homolytic decomposition at the ? bond in Ti-C.Isotopic exchange analysis using C2D4 suggested the formation of particles containing Ti-CH2CH2-Ti, Al-CH2CH2-Al, Al-CH2CH2-Ti, M = CHCH3, and MM'CHCH3 (M,M' = Al or Ti) fragments.An ESR spectral analysis established that reaction of TBT with TEA in R2O, Py, and Et3N environments produced two types of paramagnetic complexes, precursors of active centers of ethylene dimerization.The influence of various factors on the kinetics of accumulation and consumption of these complexes was investigated and their structures are suggested. Keywords: butene-1, tetrabutoxytitanium, triethylaluminum, ethylene