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。
Anti van't Hoff/le Bel compound 1 consisting of titanocene tolan and diethylborane units reacts with ethene, acetylenes, phosphaacetylenes, and acetone to give metallacycles 2, 3, 6, and 7, and in most cases the corresponding diethylorganylboranes are formed by hydroboration of the carbon-carbon or carbon-heteroatom multiple bond in the substrate. With nitriles the new bimetallic systems 9a-c (X-ray structure available for 9a) with titanium and boron centers and 12 containing zirconium and aluminium centers are generated by the formal insertion of the nitrile into the B-C-planar bond of 1 or the Al-C-planar bond of 11.
be very effective for the formation of monocyclic titanacyclopentenes in excellent yields. On the other hand, a combination of Cp2TiCl2–2n-BuLi was used for intermolecular coupling of two alkynes to form titanacyclopentadienes in good to excellent yields. A reaction temperature range from −10 to −30 °C was critical for the success of the combinations. Reactions of these in situ-prepared titanacycles