A method for the production and purification of highly pure 9,9 - to - (4 - hydroxyphenyl) - fluorene

摘要

A 9,9-bis (4-hydroxyphenyl) fluorene compound showing a melting curve maximum of at least 226.00 DEG C and a melting curve width at 5% equal to or lower than 1.30 DEG C. A purification process for the preparation of 9,9-bis (4-hydroxyphenyl) fluorene compounds comprising a first purification step employing acetonitrile and a second purification step employing a solvent selected from the group consisting of aliphatic alcools, a mixture of aromatic hydrocarbons and aliphatic alco-hols and a mixture of aromatic hydrocarbons and nitriles. A synthesis method for the preparation of 9,9-bis (4-hydroxyphenyl) fluorene compounds comprising the steps of (a) reacting in an organic solvent a phenol compound with a 9-fluorenone in the presence of an acidic condensing agent, (b) separating the crude 9,9-bis (4-hydroxyphenyl) fluorene, and (c) purifying the crude 9,9-bis (4-hydroxyphenyl) fluorene, wherein the purifying method comprises a first purification step employing acetonitrile solvent and a second purification step employing a solvent selected from the group consisting of aliphatic alcools, a mixture of aromatic hydrocarbons and aliphatic alcohols and a mixture of aromatic hydrocarbons and nitriles. IMAGE