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Experimental Section l,3,octan-5-one (9). Piperitenone (7) was prepared by the method of Beerebom9 from 178 g of methyl vinyl ketone and 686 g of mesityl oxide, giving 112 g of crude petroleum [90-125 °C bp (10 mm)], which was stirred with 28% aqueous ammonium hydroxide for 120 h at room temperature, saturated with sodium chloride, extracted in ether, extracted with 3 M HC1, dried, and concentrated to a 22% yield (based on MVK) of ca. 90% pure 8. Pulverized 85% potassium hydroxide (20 g) was dissolved in 200 mL of diethylene glycol by heating to 70 °C, and after the solution cooled to 35 °C, 14 g of hydrazine hydrate and 14 g of crude 8 were added. The solution was heated at 230 °C for 3 h and while the distillate produced was collected and cooled to room temperature. After addition of 250 mL of water, the pot solution was extracted three times (9) Beerebom,