NOVELTY - Preparing oxime compounds (I) comprises (i) reacting an aniline compound (II) with a nitrite salt in an acidic medium to a diazonium salt; and (ii) reacting the diazonium salt obtained in step (i) with formoxime in the presence of a copper salt, where step (ii) is carried out at a pH of more than 5.    USE - (I) is useful for preparing the isoxazoline compounds of formula (III) and (IV) (all claimed), which are useful as pesticides. No biological data given.    ADVANTAGE - The process exhibits higher safety and reduced environmental impact. The process is performable inexpensively and avoids or reduces the use of expensive organometallic reagents, especially of transition metal catalysts.    DETAILED DESCRIPTION - Preparing oxime compounds of formula (I) comprises (i) reacting an aniline compound of formula (II) with a nitrite salt in an acidic medium to a diazonium salt; and (ii) reacting the diazonium salt obtained in step (i) with formoxime in the presence of a copper salt, where step (ii) is carried out at a pH of more than 5.    R1 = T, 3-8C-cycloalkoxy, phenyl or 3-7 membered optionally saturated, partially unsaturated heterocyclic ring with 1-3 heteroatoms or heteroatom groups comprising N, O, S, NO, SO or SO2, as ring members, where phenyl or the heterocyclic ring may carry 1-3 substituents comprising T;    T = F, Cl, CN, NO2, SF5, 1-6C-alkyl, 1-6C-haloalkyl, 3-8C-cycloalkyl, 3-8C-halocycloalkyl, 3-8C-cycloalkyl-1-4C-alkyl, 3-8C-halocycloalkyl-1-4C-alkyl, 1-6C-alkoxy, 1-6C-haloalkoxy or 1-4C-alkoxy-1-4C-alkyl;    X1 = Br or I, or Cl (when R1 is not Cl or phenyl or heterocyclic ring carrying F or Cl); and    n = 1 or 2.    INDEPENDENT CLAIMS are included for preparing isoxazoline compounds of formula (III) and (IV) comprising the steps (i) and (ii) as above per se. In formula (III):    R2 = F, Cl, cyano, azido, nitro, -SCN, SF6, 1-6C-alkyl, 1-6C-haloalkyl, 3-8C-cycloalkyl, 3-8C-halocycloalkyl, -OR4, -Si(R5)2R6, phenyl (optionally substituted by 1-5 radicals of R7) or 3-7 membered saturated, partially unsaturated or completely unsaturated heterocyclic ring containing 1-3 heteroatoms or heteroatom groups comprising N, O, S, NO, SO or SO2, as ring members, where the heterocyclic ring may be substituted by one or more radicals R7;    R3 = H, F, Cl or CF3;    R4 = 1-6C-alkyl, 1-6C-haloalkyl, 3-8C-cycloalkyl, 3-8C-cycloalkyl-1-4C-alkyl, phenyl (optionally substituted by 1-5 radicals of R7) or 3-7 membered saturated, partially unsaturated or completely unsaturated heterocyclic ring containing 1-3 heteroatoms or heteroatom groups comprising N, O, S, NO, SO or SO2, as ring members, where the heterocyclic ring may be substituted by one or more radicals R7;    R5, R6 = 1-4C-alkyl, 3-6C-cycloalkyl, 1-4C-alkoxy-1-4C-alkyl, phenyl or benzyl;    R7 = F, Cl, cyano, azido, nitro, -SCN, SF5 or 1-10C-alkyl (partially or fully halogenated); and    m = 0-3.    In formula (IV):    R8 = H, 1-6C-alkyl (optionally substituted); and    R9 = H, CH3, CH2CH3, CH2CH2CH3, C(=O)CH3 or C(=O)OCH3.    Full Definitions are given in the DEFINITIONS (Full Definitions) Field.