Process for the preparation of substituted fluorenes

Details Process for the preparation of substituted fluorenes Process for the preparation of substituted fluorenes

2008-11-25

2009-10-20

Kumar, Shailendra (Department: 1621)

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By condensation of entire molecules or entire hydrocarbyl...

C585S457000

Reexamination Certificate

active

07605294

ABSTRACT:
Methods for the preparation of fluorenyl-type ligand structures and substituted fluorenyl groups which may be employed in metallocene-type olefin polymerization catalysts. There is provided a 2,2′-dihalogen-diphenylmethylene having a methylene bridge connecting a pair of phenyl groups. Each phenyl group has a halogen on a proximal carbon atom relative to the methylene bridge. The halogenated diphenylmethylene is reacted with a coupling agent comprising a Group 2 or 12 transition metal in the presence of a nickel or palladium-based catalyst to remove the halogen atoms from the phenyl groups and couple the phenyl groups at the proximal carbon atoms to produce a fluorene ligand structure. The coupling agent may be zinc, cadmium or magnesium and the catalyst may be a monophosphene nickel complex. The halogenated diphenylmethylene may be an unsubstituted ligand structure or a monosubstituted or disubstituted ligand structure. The halogenated diphenylmethylene may be monosubstituted with a tertiary butyl group or may be a dialkyl diphenylmethylene having alkyl substituents at the directly distal positions of the phenyl groups relative to the methylene bridge.

REFERENCES:
Kajigaeshi et al, Bull. Chem. Soc. Jpn, 59, 97-103, 1986.

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