Patent · US Expired

Process for the preparation of fluorene-9-carboxylic acid

US4564700A · kind A · utility

0Cited by

8References

6Claims

0Family size

Assignee

Rutgerswerke Aktiengesellschaft · DE

Inventors

Winfried Orth
Emmerich Pastorek · Hemsbach, DE
Werner Fickert · Mannheim, DE

Key dates

Filing date	Nov 16, 1983
Grant date	Jan 14, 1986
Priority date	—
Expiry date	Nov 16, 2003

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

An improved process for the preparation of fluorene-9-carboxylic acid comprising reacting fluorene and a dialkyl carbonate with alkyls of 1 to 5 carbon atoms in the presence of a member of the group consisting of alkali metal hydrides or potassium alcoholate of an aliphatic alcohol of 1 to 5 carbon atoms, neutralizing the mixture and saponifying the resulting fluorene-9-carboxylic acid ester to obtain fluorene-9-carboxylic acid in good yields.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.