Back to results
US 5,084,533 AGranted
Neat (solventless) hydrogenation of 4-acetoxyacetophenone in the production of 4-acetoxystyrene and its polymers and hydrolysis products
AssigneeHoechst Celanese Corporation
InventorsBakulesh N. Shah, Donna L. Keene
Life of this patent
Estimating the term…
Abstract
A process for the solventless (neat) hydrogenation of 4-acetoxyacetophenone to produce 4-acetoxyphenyl methylcarbinol. The reaction proceeds by heating at 54.degree. C. to 120.degree. C. with an excess of hydrogen in the presence of a Pd/C or activated nickel such as Raney Nickel catalyst in the absence of a solvent. The 4-acetoxyphenyl methylcarbinol may then be dehydrated to 4-acetoxystyrene. The later may be polymerized to poly(4-acetoxystyrene) and hydrolyzed to poly(4-hydroxystyrene).
Claims5
A process for the production of 4-acetoxystyrene which comprises:
- a) acylating phenol with acetic anhydride to produce 4-hydroxyacetophenone;
- and
- b) acylating the 4-hydroxyacetophenone with acetic anhydride to form 4-acetoxyacetophenone;
- and
- c) heating 4-acetoxyacetophenone at a temperature of from about 54.degree. C. to about 120.degree. C. in the presence of at least a stoichiometric amount of hydrogen, and a catalyst selected from the group consisting of Pd/C or activated nickel in the absence of a solvent, for a sufficient time to produce 4-acetoxyphenyl methylcarbinol;
- and
- d) dehydrating the 4-acetoxyphenyl methylcarbinol to produce 4-acetoxystyrene.
4 more elements
Dependencies are inferred from the claim text.