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US 10,239,809 B2Granted
Methods for preparing bridged bi-aromatic ligands
AssigneeUnivation Technologies, LLC
InventorsCatherine Anne Faler, C. Jeff Harlan, Kevin P. Ramirez
Life of this patent
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Abstract
New methods of preparing bridged bi-aromatic ligands are disclosed. The methods employ direct di-ortho-lithiation of aromatic rings of bridged protected bi-aromatic diphenols. The ligands may be used to prepare transition metal compounds useful as catalysts in olefin polymerization.
Claims18
A method for preparing a bridged bi-aromatic phenol ligand of formula (I) comprising:
- deprotecting a protected bi-aromatic phenol of formula (IV):
- to yield the bridged bi-aromatic phenol ligand of formula (I):
- wherein each of R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14 is independently selected from the group consisting of hydrogen, halide, optionally substituted hydrocarbyl, heteroatom-containing optionally substituted hydrocarbyl, alkoxy, aryloxy, silyl, boryl, dialkyl amino, alkylthio, arylthio and seleno;
- optionally two or more R groups can combine together into ring structures with such ring structures having from 3 to 100 non-hydrogen atoms in the ring;
- B is a bridging group having from one to 50 non-hydrogen atoms;
- Y and Y′ are independently selected from O, S, NRa and PRa wherein Ra is optionally substituted hydrocarbyl;
- Ar is optionally substituted aryl or heteroaryl and PG is a protecting group.
4 more elements
Dependencies are inferred from the claim text.