Selective bromination of aromatic compounds
AssigneeAlbemarle Corporation
InventorMahmood Sabahi
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Abstract
Aromatic substrates such as fluorobenzene can be selectively brominated in high yield and conversion in short reaction periods by reacting the substrate with a brominating agent in a liquid reaction medium and in the presence of a catalyst composition formed by including in the medium a combination of (i) a shape selective HY or HM or zeolite catalyst, and (ii) at least one Lewis acid in a ratio of from 0.005 to 0.5 part by weight of (ii) per part by weight of (i). The bromination is performed at one or more temperatures in the range of 30 to 70° C., and the amount of the zeolite is no more than about 10 grams per mole of aromatic substrate.
Claims20
A process for ar-brominating an ar-brominatable aromatic substrate, said process comprising reacting said substrate with a brominating agent in a liquid reaction medium at a bromination temperature in the range of 30 to 70° C. and in the presence of a catalyst composition formed by including in said medium a combination of (i) a shape selective HY or HMor zeolite catalyst, and (ii) at least one Lewis acid in a ratio of from 0.005 to 0.5 part by weight of (ii) per part by weight of (i), the amount of said zeolite being no more than about 10 grams per mole of aromatic substrate.
A process for ar-brominating an ar-brominatable aromatic substrate, said process comprising reacting said substrate with bromine in a liquid reaction medium at a bromination temperature in the range of 30 to 70° C. and in the presence of a catalyst composition formed by including in said medium a combination of (i) a shape selective HY zeolite catalyst, and (ii) at least one Lewis acid in a ratio of from 0.005 to 0.5 part by weight of (ii) per pair by weight of (i), the amount of said zeolite being in the range of 2 to 6 grams per mole of aromatic substrate.
Dependencies are inferred from the claim text.