Some environmentally friendly catalysts such as HY and H β zeolites, various cation exchanged β zeolites, and some other solids have been used in the acylation reaction of ethylidenecyclohexane with acetic anhydride at room temperature to synthesize 3 (1 cyclohexenyl) 2 butanone instead of conventional catalysts. The effect of the amount of HY zeolite used on the acylation reaction was investigated. The yield of the acylated product was 72% in the case of n (ethylidenecyclohexane)∶ n (acetic anhydride)∶ m (HY zeolite)=1 mmol∶10 mmol∶0 100 g, reaction temperature: 25 ℃, and reaction time:2 h. The regenerated HY zeolite showed almost the same catalytic activity as the fresh zeolite. Some of the environmentally friendly catalysts such as HY and H β zeolites, various other salts β zeolites, and some other solids have been used in the acylation reaction of ethylidenecyclohexane with acetic anhydride at room temperature to synthesize 3 (1 cyclohexenyl) 2 butanone instead of conventional catalysts The yield of the acylated product was 72% in the case of n (ethylidenecyclohexane): n (acetic anhydride): m (HY zeolite) = 1 mmol: 10 mmol: 100 g, reaction temperature: 25 ° C, and reaction time: 2 h. The regenerated HY zeolite showed almost the same catalytic activity as the fresh zeolite.