Alkyl-5,6-diphenylpyridazine derivatives combining several main features of ACATinhibitors, such as a long alkyl side chain linked to a heterocycle and the o-diphenyl system, were synthesized and tested. Moreover, modeling studies on representative terms were performed. Some compounds displayed ACAT inhibition in the micromolar range, both on the enzyme isolated from rat liver microsomes and in cell-free
Arthropodicidal tetrahydropyridazines of Formulae I and II, ##STR1## wherein Q,X,X.sup.1 Y, and G are as defined in the text, compositions containing them and their use in the control of arthropods.
##STR1## Arthropodicidal tetrahydropyridazines of Formulae (I) and (II), wherein Q, X, X.sup.1, Y and G are as defined in the text, compositions containing them and their use in the control of arthropods.