Silica-supported H_4SiW_(12)O_(40) catalyzed efficiently alkylation/acrylation of 1,3,5-trimethylbenzene or p-xylene with gamma-butyrolactone to 4-(2,4,6-trimethylphenyl) butyric acid or to dimethyl-alpha-tetralone (5,8-dimethyl-3,4-dihydro-2H-naphtalen-1-one), while other typical solid acids such as zeolites and SiO_2-Al_2O_3 were much less active.
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