74010-34-7Relevant academic research and scientific papers
1,1-Olefin-bridged bis-(2-indenyl) metallocenes of titanium and zirconium
Morton, Jason G. M.,Al-Shammari, Haif,Sun, Yunshan,Zhu, Jiangtao,Stephan, Douglas W.
, p. 13219 - 13231 (2014)
Tetrasubstituted alkenes bearing geminal 2-indenyl substituents-9-[bis(1H- inden-2-yl)methylidene]-9H-fluorene (6), 2,2′-(2,2-diphenylethene-1,1- diyl)-bis(1H-indene) (7), and 2,2′-(2-propylpent-1-ene-1,1-diyl)-bis(1H- indene) (8) have been synthesized and metallated to form a new class of ansa titanium and zirconium metallocene complexes containing a single sp 2-hybridized carbon bridge. The synthesis of the tetramethylated bis-indenyl Zr-analog is described. In addition, the 1,1-bis-indenyl ethylene is prepared and the Zr complex is modified by olefin metathesis. X-ray structure analyses reveal strained η5 sandwich complexes with highly open metal centers. These complexes have proven active in the polymerization of ethylene and its copolymerization with 1-hexene.
Zn(II)- or Ag(I)-catalyzed 1,4-metathesis reactions between 3-en-1-ynamides and nitrosoarenes
Gawade, Sagar Ashok,Huple, Deepak B.,Liu, Rai-Shung
supporting information, p. 2978 - 2981 (2014/03/21)
Catalyst-dependent metathesis reactions between 3-en-1-ynamides and nitrosoarenes are described. Particularly notable are the unprecedented 1,4-metathesis reactions catalyzed by Ag(I) or Zn(II) to give 2-propynimidamides and benzaldehyde derivatives. With 3-en-1-ynamides bearing a cycloalkenyl group, 1,4-oxoimination products were produced efficiently. We have developed metathesis/alkynation cascades for unsubstituted 2-propynimidamides and benzaldehyde species generated in situ, to manifest 1,4-hydroxyimination reactions of 3-en-1-ynes. Both 1,4-oxoiminations and 1,4-hydroxyiminations increase the molecular complexity of products.
