Amine elimination process for making single-site catalysts
AssigneeEquistar Chemicals, LP
InventorBarbara M. Tsuie
Life of this patent
Estimating the term…
Abstract
An amine-elimination process for making single-site catalysts is disclosed. First, an indenoindole or its synthetic equivalent reacts with a tetrakis(dialkylamino) Group 4 metal compound to give a tris(dialkyl-amino) compound. This versatile intermediate can be halogenated, alkylated, or reacted directly with cyclopentadienyl precursors to provide valuable indenoindolyl-Group 4 metal complexes. The process selectively provides mono-indenoindolyl complexes. In addition, it enables the economical preparation of desirable Cp- or Cp-like derivatives and allows the use of an inexpensive Group 4 transition metal source.
Claims6
A process which comprises:
- (a) reacting an indenoindole or its synthetic equivalent with about one equivalent of a tetrakis(dialkylamino) Group 4 metal compound;
- and
- (b) reacting the product from step (a) with an excess of a halogenating agent to produce an indenoindolyl Group 4 metal trihalide.
A process which comprises:
- (a) reacting an indenoindole or its synthetic equivalent, with about one equivalent of a tetrakis(dialkylamino) Group 4 metal compound;
- and
- (b) reacting the product from step (a) with an excess of an alkylating agent to produce an indenoindolyl Group 4 metal trialkyl.
A process which comprises:
- (a) reacting an indenoindole or its synthetic equivalent, with about one equivalent of a tetrakis(dialkylamino) Group 4 metal compound;
- and
- (b) reacting the product from step (a) with about one equivalent of a cyclopentadiene compound to produce a cyclopentadienyl (indenoindolyl) Group 4 metal bis(dialkylamino) compound.
Dependencies are inferred from the claim text.