Examples of substituents for substituted aryl groups include one or more of C 1 -C 4 alkyl, C 1 -C 4 alkoxy, and hydroxyl.
The organic quaternary base includes tetrabutylammonium hydroxide (TBAH), benzyltrimethylammonium hydroxide (BTMAH), tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetramethylammonium hydroxide (TMAH), and combinations thereof.