| abstract |
PURPOSE: To obtain the titled compound useful as a raw material of resin, rationally in high efficiency, by heat-treating 2,2-bis(4-hydroxyphenyl)propane in the presence of a catalytic amount of perfluoroalkanesulfonic acid. n CONSTITUTION: Objective 6,6'-dihydroxy-3,3,3',3'-tetramethyl-1,1'-spirobiindane of formula can be produced by heating 2,2-bis(4-hydroxyphenyl)propane at 50W200°C, preferably about 60W160°C in the presence of a catalytic amount of a perfluoroalkanesulfonic acid (especially preferably trifluoromethanesulfonic acid, and its amount is 0.05W20wt%, especially 0.1W10wt% based on the raw material). n EFFECT: The process is free from the load such as the waste liquid disposal, etc., and has industrial advantage. n COPYRIGHT: (C)1987,JPO&Japio |