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Diffusion in Agar Gels by a Light Absorption Method 2879 and 2.94 g. of absolute ethanol. Ethyl y-(o-methoxyphenyl)-butyrate (14 g., 0.063 mole) was then added dropwise with stirring and the mixture refluxed for twelve hours. The reaction mixture was decomposed with water and extracted with ether. A red viscous oil remained after distillation of ether.5 -M ethoxy-3,4-dihydro-1,2-naphthalic Anhydride (VIII).-The above oxalyl ester was added slowly to 120 cc. of concentrated sulfuric acid, the temperature being kept between 20-25°, and the mixture allowed to stand for two hours at room temperature. The solution was poured onto ice, the yellow solid filtered and recrystallized from benzene-ligroin, yield 5.2 g. (36% based on starting ester VIb), m. p. 169-170°.

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