Table 1. Optimization of the Reaction Conditions^abcdefghij.

^aReaction was carried out with 104 mg of PS in the presence of an acid catalyst in 2 mL of a solvent under O₂ (1 bar) and violet-blue light (405 nm, 9 W) for 15 h.

^bCatalytic amount of acid and the yield of products are based on the single repeat unit (1 mmol) of polystyrene.

^cYield determined by ¹H NMR with 1,3,5-trimethoxybenzene as an internal standard; isolated yield in parentheses.

^dWithout light.

^e365 nm.

^f475 nm.

^g10 h.

^h24 h.

ⁱBenzene/CH₃CN (1/1, 1 mL).

^jUnder air.