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Natural and synthetic phosphates: New and clean heterogeneous catalysts for the synthesis of 5-arylhydantoins

Paper ID Volume ID Publish Year Pages File Format Full-Text
44273 46011 2006 4 PDF Available
Title
Natural and synthetic phosphates: New and clean heterogeneous catalysts for the synthesis of 5-arylhydantoins
Abstract

Natural and synthetic phosphates were used as heterogeneous catalysts to promote the Friedel–Crafts reaction between 5-bromohydantoin and aromatic compounds. In the case of phenol, ortho and para isomers were always obtained. Fluoroapatite (FAP) and natural phosphate (NP) lead to the best selectivity. However, the best overall yield of 5-(hydroxyphenyl)hydantoin was obtained when hydroxyapatite (HAP) was used. This method can also be applied to other aromatics, such as anisole and thiophene. In some cases, activation by zinc bromide (ZnBr2) was also investigated in order to increase the activity of these phosphate catalysts.

Keywords
Phosphate catalysts; Clean processes; Heterogeneous catalysis; Synthesis of 5-arylhydantoins
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 298, 10 January 2006, Pages 261–264
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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