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US 4,933,495 AGranted
Process for the production of 3-mono or 3,5 dihalogenated 4-acetoxystyrene, its polymerization, and hydrolysis
AssigneeHoechst Celanese Corporation
InventorsMohammad Aslam, Richard Vicari, Ralph Dammel, Juergen Lingnau, Karl-Friedrich Doessel
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Abstract
The present invention relates to a process for the production of 3-mono or 3,5-disubstituted-4-acetoxystyrene wherein the 3- or 3,5-substitution is independently C.sub.1 to C.sub.10 alkyl, chlorine, bromine, iodine, --NO.sub.2, --NH.sub.2, or --SO.sub.3 H, a process for its polymerization, hydrolysis, and use in a variety of compositions.
Claims7
A method for preparing 3-mono- and 3,5-dihalogenated 4-hydroxy and 4-acetoxystyrenes which comprises
- (a) halogenating a 4-hydroxyacetophenone with general formula ##STR5## wherein R.sub.1 is hydrogen or C.sub.1 to C.sub.10 alkyl;
- and
- R.sub.2 and R.sub.3 are independently hydrogen, alkyl, alkoxy, or halogen, wherein R.sub.1 and R.sub.2 may be combined to form a cycloaliphatic ring, consisting of 6 to 12 members,
- (b) esterification of the hydroxyl function to form a halogenated 4-acetoxyacetophenone derivative,
- (c) reduction of the ketone function to a hydroxyl function,
- (d) dehydration to form 3-mono or 3,5-dihalogenated 4-acetoxystyrene;
- with optional
- (e) hydrolysis to form the 3-mono or 3,5-dihalogenated 4-hydroxystyrene.
5 more elements
Dependencies are inferred from the claim text.