METHOD FOR PRODUCING 9-SPIROFLUORENE COMPOUND

Title:

METHOD FOR PRODUCING 9-SPIROFLUORENE COMPOUND

Document Type and Number:

Japanese Patent JP2004155659

Kind Code:

A

Abstract:

To provide a method for efficiently producing a 9-spirofluorene compound useful as a raw material for a phenanthrene spiroindenonaphthopyran compound having excellent photochromic characteristics.

An organometallic compound such as 4-lithiophenanthrene derived from 9-fluorenylmethanol is reacted with a fluorenone compound such as 3,7-dimethoxy-5-t-butyldimethylsilyloxybenzo[c]fluoren-7-one to produce the 9-spirofluorene compound. In the process, the 9-fluorenylmethanol is mixed with an alkali metal hydride compound in an aprotic solvent and then treated with a formic ester. The resultant fluorene-9-carbazole is then subjected to dehydration transformation to synthesize the 9-spirofluorene compound.

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Inventors:

FUKADA NORIYUKI
SHIIKI TAKAFUMI
YAMAGUCHI MASAO

Application Number:

JP2002320031A

Publication Date:

June 03, 2004

Filing Date:

November 01, 2002

Export Citation:

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Assignee:

TOKUYAMA CORP

International Classes:

C07C41/30; C07C43/21; (IPC1-7): C07C41/30; C07C43/21

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