ehloro-diphenyl-trichloroethane, the generic name of the active insecticidal principle. Theoretically there are forty-five possible dichlorodiphenvltrichloroethanes. However, the term "DDT" is confined to the product obtained on condensation of chloral (or its alcohólate or hydrate) with chlorobenzene in the presence of sulfuric acid.At the present time (spring 1915) three grades of DDT are recognized by the War Production Board and the armed forces of this country-technical DDT, purified or aerosol DDT, and pure DDT. As its name implies, technical DDT is a commercial grade complying with all the specifications outlined in the Joint Armv-Navv Specifications (JAN-D-.36A, Mar. 16, 1945). As will be shown in this report, it is a complex mixture containing upwards of 70% of l-trieliloro-2,2-bis-%chlorophenyl) -ethane (hereinafter called p,jr-DDT) (I), the major impurity being the o,p'-DDT isomer, 3 -trichloro-2-o-clilorophcuyl-2-/)chlorophenvlethane (II).
Vol. 68 chloride to make the solution acidic to congo red paper. The yields were determined largely by the recovery which each recrystallization solvent permitted, as the condensation reaction itself was almost quantitative.One derivative was prepared by using 2-hydroxy-3diethylaminopropylamine as the side-chain.Whenever the dihydrochloride was obtained as a hydrate, a sample of the anhydrous form (very hygroscopic) was prepared for characterization by heating the hydrate at 140°, or by recrystallizing it from an inert solvent containing thionyl chloride.12-(3 '-Diethylaminopropylamino) -benz [a ¡acridin e Dihydrochloride.-This compound was prepared in a manner analogous to the procedure used for the corresponding benz-[c]acridine derivatives. The yield after two recrystallizations from propanol-dibutyl ether was 31% of very small, yellow needles, m. p. 250-252°b y the instantaneous method.
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