Patent ID: 6225512
Filing Date: 2001-05-01
Classification: C07C

Abstract:
A process for preparing purified 3-(4-hydroxyphenyl)-1,1,3-trimethylindan-5-ol comprising(a) forming a reaction mixture by dissolving at least one member selected from the group consisting of isopropenylphenol, a dimer of isopropenylphenol and an oligomer of isopropenylphenol in an organic solvent having a boiling temperature of 110 to 150.degree. C.,(b) heating the reaction mixture to a temperature within the range of 60 to 110.degree. C.,(c) adding to the reaction mixture an acid catalyst in an amount of 0.002 to 5% relative to the weight of said member,(d) heating the reaction mixture to boiling to allow reaction at the boiling temperature for 1 to 600 minutes,(e) optionally neutralizing the reaction mixture at a temperature within the range of 60 to 100.degree. C., by adding a base,(f) adding water to the reaction mixture and cooling it to a temperature within the range of 0 to 30.degree. C., to form a precipitate,(g) separating off and drying said precipitate and recrystallizing said precipitate from its solution in a mixture of acetic acid and water.