... '-dinaphthalene Binaphthol, 2,2'-dihydroxy-1,l'-dinaphthalene as its scientific name, has a melting point of 2l7.5 to 2l9 ... . Its molecularBinaphthol, 2,2'-dihydroxy-1,l'-dinaphthalene as its scientific name, has a melting point of 2l7.5 to 2l9 ...