Transition metal catalysts for (co) polymerizing of olefinic monomers

摘要

A compound of the formula Ia or Ib; where, in the formula Ia, E₁ is O, S, Se, Te, NR, CR₂, or PR; E₂, E₃ are each CR, N, or P; E₄ is N, or P; E₅ is OH, SH, NHR, OR', SR', or NRR'; E₆ is NH, PH, NR', or PR'; R⁵, R⁶ are each hydrogen or a linear, branched or cyclic alkyl radical or an aryl radical; R¹, R², R³, R⁴ are each hydrogen, a linear, branched or cyclic alkyl radical, an aryl radical, a halogen or a nitro group; R is hydrogen, a linear, branched or cyclic alkyl radical; R' is a linear, branched or cyclic alkyl radical; where at least one of the groups E₅ and E₆ contains a hydrogen atom; and in the formula Ib, the symbols E₁, E₄, E₅, E₆, R⁵, R⁶, R¹, R², R³, R⁴, R and R' are as defined in formula Ia; and E'₂ and E'₃ are each O, S, Se, Te, NR, CR₂, or PR.