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
环戊二烯基(Cp)配体与二烯基或烯基噻吩并茂上的二烯基或烯基配体的偶联反应以高收率或高收率得到二烯基环戊二烯或烯基环戊二烯衍生物。通过用羧酸使双(环戊二烯基)噻吩基环戊二烯质子化来制备二烯基噻吩衍生物。通过二氧杂环戊二烯与NCS的反应形成了氯二烯基钛茂新衍生物。通过由Cp 2 TiEt 2和炔烃制备的二茂钛环戊烯与t-BuOH。通过对单晶的X射线分析来确定烯基噻吨并茂(在1,2-二苯基乙烯基的情况下)的结构。将这些二烯基,氯二烯基或烯基噻吩并茂在50°C下用偶氮苯处理6 h,并以高收率或高收率获得了相应的二烯基环戊二烯,氯二烯基环戊二烯和烯基环戊二烯衍生物。该结果支持Cp配体与钛环戊二烯的二烯部分偶联反应的逐步机理的存在,在偶氮苯存在下得到茚衍生物。
Acetylene derivatives of titanocene
作者:Helmut G. Alt、Heidi E. Engelhardt、Marvin D. Rausch、Lawrence B. Kool
DOI:10.1021/ja00298a052
日期:1985.6
ALT, H. G.;ENGELHARDT, H. E.;RAUSCH, M. D.;KOOL, L. B., J. AMER. CHEM. SOC., 1985, 107, N 12, 3717-3718
作者:ALT, H. G.、ENGELHARDT, H. E.、RAUSCH, M. D.、KOOL, L. B.
DOI:——
日期:——
TUMAS, WILLIAM;WHEELER, DAVID R.;GRUBBS, ROBERT H., J. AMER. CHEM. SOC., 109,(1987) N 20, 6182-6184
作者:TUMAS, WILLIAM、WHEELER, DAVID R.、GRUBBS, ROBERT H.