Affordable Access

Publisher Website

Interaction of bis(trimethylsilyl)acetylene complex of titanocene with tris(pentafluorophenyl)borane. Synthesis and structure of a new type of zwitterionic metallocene (η5-C5H5){η5-[C5H4B(C6F5)3]}Ti

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
598
Issue
2
Identifiers
DOI: 10.1016/s0022-328x(99)00716-0
Keywords
  • Zwitterionic Metallocenes
  • Acetylene Complexes
  • Titanium
  • Tris(Pentafluorophenyl)Borane
  • Electrophilic Substitution
  • X-Ray Structure

Abstract

Abstract In the interaction of the bis(trimethylsilyl)acetylene complex of titanocene Cp 2Ti(Me 3SiC 2SiMe 3) with an equimolar amount of B(C 6F 5) 3 in toluene at 20°C, electrophilic substitution of a hydrogen atom in one of the η 5-C 5H 5 rings by a B(C 6F 5) 3 group takes place and the paramagnetic zwitterionic titanium complex (η 5-C 5H 5){η 5-[C 5H 4B(C 6F 5) 3]}Ti ( I) is produced. The formation of I is accompanied by liberation of molecular hydrogen. Bis(trimethylsilyl)acetylene and 1,2-bis(trimethylsilyl)ethane were found in organic products of the reaction. An X-ray diffraction study of complex I revealed the coordination of the ortho-fluorine atoms of two C 6F 5 groups with the positively charged titanium centre. In contrast to other known titanium, zirconium and hafnium zwitterionic metallocenes, complex I contains a metal in the +3 oxidation state and does not contain any σ-bonded organic radicals at the metal atom.

There are no comments yet on this publication. Be the first to share your thoughts.