Reactions of Cp2M(PMe3)2 complexes (M = Ti, Zr) with acetylenes. Selective formation of trans-polyacetylene at low temperatures
作者:Helmut G. Alt、Heidi E. Engelhardt、Marvin D. Rausch、Lawrence B. Kool
DOI:10.1016/s0022-328x(00)98895-8
日期:1980.7
The reaction of Cp2Ti(PMe3)2 with C2H2 gives the substitution product Cp2Ti(C2H2)(PMe3), the titanacyclopentadiene Cp2Ti(C4H4), and trans-polyacetylene. A mechanism for the catalytic formation of polyacetylene is proposed. Substituted acetylens R1C2R2 (R1 ≠ R2 = H, Me, Ph) react with Cp2Ti(PMe3)2 in an analogous manner except that no polyalkynes are produced. The Zr derivative Cp2Zr(PMe3)2 and C2H2
Cp 2 Ti(PMe 3)2与C 2 H 2的反应产生取代产物Cp 2 Ti(C 2 H 2)(PMe 3),钛环戊二烯Cp 2 Ti(C 4 H 4)和反式-聚乙炔。提出了一种催化形成聚乙炔的机理。取代的乙炔R 1 C 2 R 2(R 1 ≠R 2 = H,Me,Ph)与Cp 2 Ti(PMe 3)2反应以类似的方式,除了不生产聚炔。Zr衍生物Cp 2 Zr(PMe 3)2和C 2 H 2产生不稳定的Cp 2 Zr(C 2 H 2)(PMe 3)。
Coupling Reaction of a Cyclopentadienyl Ligand with a Dienyl or Alkenyl Moiety on Titanocene
Coupling reactions of a cyclopentadienyl (Cp) ligand with a dienyl or alkenyl ligand on dienyl- or alkenyltitanocenes proceeded to give dienylcyclopentadiene or alkenylcyclopentadiene derivatives in good to high yields. Dienyltitanocene derivatives were prepared by protonation of bis(cyclopentadienyl)titanacyclopentadienes with carboxylic acids. Chlorodienyltitanocene derivatives were formed by the