| 摘要 |
Oxadiazines of formula (I), wherein R<1> is F, Cl or fluoralkoxy and R<2> is alkyl, are prepared by reacting hydrazine derivatives of formula (II) with a dialkoxymethane in the presence of a protic acid catalyst in an inert solvent under conditions which allow for the prompt removal of the alcohol by-product by distillation. The reaction can be combined with the preparation of the hydrazines derivatives (II) from the corresponding ketones and hydrazines NH2-NHR<3> in the presence of the same protic acid catalyst and an inert solvent. Oxadiazines I are useful as intermediates in the preparation of arthropodicidal agents. |
