Patent ID: 9738580
Date: 2017-08-22
CPC Classifications: C07C,C07D,C08L

Claim:
1. A method for producing [1,1′-binaphthalene]-2,2′,7,7′-tetraol, the method comprising: a step of bringing a crude product produced by dimerization reaction of naphthalene-2,7-diol or a naphthalene-2,7-diol derivative into contact with an aromatic solvent; a step of separating [1,1′-binaphthalene]-2,2′,7,7′-tetraol dissolved in the aromatic solvent from insoluble substances; and a step of removing the solvent from a solution of [1,1′-binaphthalene]-2,2′,7,7′-tetraol.