Patent · US Expired

Process for the production of 3,5-disubstituted-4-acetoxystyrene

US5072025A · kind A · utility

2Cited by

7References

4Claims

0Family size

Assignee

Hoechst Celanese Corporation · US

Inventors

Richard Vicari · Pearland, US
Mohammad Aslam · Port Aransas, US
Wilson B. Ray · Beeville, US
Kenneth G. Davenport · Port Aransas, US
Ralph R. Dammel · Flemington, US
Juergen Lingnau · Mainz, DE
Karl-Friedrich Doessel · Wiesbaden, DE

Key dates

Filing date	Jul 26, 1990
Grant date	Dec 10, 1991
Priority date	—
Expiry date	Jul 26, 2010

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C49/825
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

3-substituted-4-hydroxy- and 4-acetoxystyrene compounds, especially 3,5-di(methyl, bromo or chloro)-4-acetoxystyrene as well as a process for its preparation. 2,6-dimethylphenol is acylated with acetic anhydride and HF catalyzed to produce 3,5-dimethyl-4-hydroxy-acetophenone. After subsequent esterification with acetic anhydride and catalyzed hydrogenation to form 1-(3',5'-dimethyl-4'-acetoxyphenyl)ethanol, this intermediate is then dehydrated with an acid and a polymerization inhibitor to produce 3,5-dimethyl-4-acetoxystyrene.

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