By H. Geissbühler, P. C. Kearney and G. T. Brooks (Eds.)

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XII. EFFECT OF HEAT AND OXIDIZING AGENTS ON IEFTOHIOS . 5-dichlorophenyl) O-methyl phenylphosphonothioate I (Leptophoe), an important insecticide of moderate mammalian toxic ity. \=

Expensive and dangerous basic agents are replaced by aqueous NaOH, 3. the processes are well suited for automation and counterflow realization, 4. the formation of industrial wastes can be easily minimized. The special features of this approach as well as some examples will be discussed. H. Hintermaier, H. Michaud and M. -Germany N101 SYNTHESIS OF SUBSTITUTED UREAS WITHOUT ISOCYANATES. In a simple, economically interesting manner there can be prepared ureas, which have two alkyl-substituents at the one N-atom and an alkyl - respectively aryl-substituent at the other.

Horne Agricultural Research Division Shell Development Cie. P. 0. Box 4248, Modesto, California, USA NITROMETHYLENE INSECTICIDES Nitromethylene insecticides are characterized by the location of this function alpha to nitrogen in a heterocyclic system. The principal effects of structure on activity are manifest in (1) the number and character of hetero atoms in the ring, (2) the ring size, and (3) the nature of substitution on (a) nitrogen, (b) the nitromethylene side chain, and (c) the ring carbons.