Another important carbocation reaction is the Friedel-Crafts-type conversion. 9 These commercially important reactions involve generation of carbocations and their reactions with arene nucleophiles by inter-and intramolecular processes. To test the use of our printed catalyst, we examined the spirocyclization of a fluorenol derivative (eq 5). Thus, the fluorenol 12 gives the spirocycle 13 in 61% isolated yield from reaction with the ABS-SO3H printed catalyst. Although this is considerably lower yield than recent conversions reported in the literature and patents 10 -where compound 13 is described as a useful component in organic electroluminescent devices -the conversion demonstrates that the printed catalyst may be useful in promoting Friedel-Crafts-type reactions. In this case, ionization of alcohol 12