TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The step (ii) is carried out at a pH of at least 5.1, preferably 5.5-7. The step (ii) is carried out in the presence of a copper(I) salt. The copper(I) salt is generated in situ by carrying out step (ii) in the presence of a copper(II) salt and a reduction agent. In step (ii), the diazonium salt is added to a solution containing the formoxime, a copper salt and, if the copper salt is a copper(II) salt, also a reduction agent. The diazonium salt is cooled to -10 to +15 degrees C before being added to the solution containing the formoxime, a copper salt and optionally reduction agent. The solution containing the formoxime, a copper salt and optionally a reduction agent is adjusted to a pH of greater than 5, preferably 5.5-7, before the diazonium salt is added. In the course of the reaction of step (ii), the pH is controlled continuously or periodically and if necessary adjusted to a pH of greater than 5, preferably 5.5-7. The adjustment of the pH is performed by using a system which comprises a buffering agent. The adjustment of the pH is performed by using at least one base which comprises an acetate salt, preferably sodium acetate. The formoxime used in step (ii) is prepared before step (ii) by reacting formaldehyde or a formaldehyde source with hydroxylamine or its acid addition salt. The aniline compound (II), before being reacted with the nitrite salt, is recrystallized in an acidic aqueous solution. The preparation method of (III) further comprises (iii-1) reacting (I) with a phenyl compound of formula (V) in the presence of a halogenating agent and a base to give (III); or (iii-2a) reacting (I) with a halogenating agent to give a oxime compound of formula (VI), and (iii-2b) (VI) with the phenyl compound (V) in the presence of a base to give (III). The preparation method of (IV) further comprises steps (iii-1) or (iii-2a) and (iii-2b) as above per se; and (iv) reacting (III) obtained in step (iii-1) or (iii-2b) with carbon monoxide and an amine compound of formula (NHR8R9) in the presence of a palladium catalyst, to give (IV). The compound (V) is obtained by reacting a phenyl carbonyl compound of formula (VII) with a methylenating agent. (VII) is prepared by reacting a phenyl compound of formula (VIII) with a carboxylic acid derivative of formula (R3CF2-C(O)R1a) and magnesium or another Grignard reagent.X2 = halo;X3 = CI, Br or I; andR1a = OH, OC(O)CF3, halo, 1-6C-alkoxy, N(CH3)2, N(C2H5)2, N(OCH3)CH3, piperidinyl, morpholinyl or piperazinyl, where the last three radicals are bound via their nitrogen atom.Preferred Components: The reduction agent is sulfite salts, dithionite salts, thiosulfate salts, meta-bisulfite salts, hydroxymethanesulfinate salts, tin chloride, zinc and hydrazine. The halogenating agent used in step (iii-1) or (iii-2a) is chlorine, hypochloric acid, hypochlorite salts, antimony pentachloride, phosphorus pentachloride, phosphorus oxychloride, phosphorus trichloride, sulfuryl chloride, thionyl chloride, N-chlorosuccinimide (preferred), bromine, N-bromosuccinimide or N-iodosuccinimide. The methylenating agent is dimethyltitanocene, diphenylmethylphosphine oxide, dimethoxymethyl phosphine sulfide, pentamethylphosphonic diamide, dimethyl sulfoxide, (trialkylstannyl)(trimethylsilyl)methane, trimethylsilyl(phenylthio)methane, titanium tetrachloride and diiodomethane or dibromomethane, dichlorotitanocene and aluminum trimethyl, methylenetriphenylphosphine (preferred), trimethylsulfonium iodide, dichloro(cyclopentadienyl)zirconium and diiodomethane or dibromomethane dimethylmethanephosphonate, methanesulfonyl chloride, (chloromethyl)trimethylsilylane, diazomethyltrimethyl silane, Nysted's reagent and precursors of the above methylenating agents. The methylenetriphenylphosphine is prepared from triphenylmethyl phosphinium iodide, triphenylmethyl phosphinium bromide or triphenylmethyl phosphinium chloride in situ or shortly before the reaction of (VII) with the methylenating agent is carried out. In case that n is 1, R1 is bound in ortho position to the group X1 in compounds (I), (II), (III) and (VI) or in ortho position to the carboxamido group C(O)NR8R9 in compound (IV). The compound (V) is a compound of formula (V1).R2a, R2c = H or R2, preferably H, F, Cl or CF3;R2b = H or R2, preferably H, F, Cl or CN; andR3 = H, F, Cl or CF3. Full Definitions:    R8 = H, 1-6C-alkyl (optionally containing 1-4 substituents of R10 or Z-A);    Z = chemical bond, CH2, CH2CH2 or C=O;    A = (6-chloropyridazin-3-yl), (2-chloro-3-pyridyl), (2-chloro-4-pyridyl), (3-chloro-2-pyridyl), (3-chloro-4-pyridyl), (4-chloro-2-pyridyl), (4-chloro-3-pyridyl), (5-chloro-2-pyridyl), (5-chloro-3-pyridyl), (6-chloro-2-pyridyl), (6-chloro-3-pyridyl), (2-chloropyrimidin-4-yl), (2-chlorothiazol-4-yl), (5-chloro-1H-1,2,4-triazol-3-yl), (2,2-dichlorocyclopropyl), (2,2-dichloro-1-methyl-cyclopropyl), (5-methyl-2,3,5-triaza-1-yl), (2-methyloxazol-4-yl), 1,2,4-oxadiazol-3-yl, oxazol-4-yl, pyridazin-3-yl, 2-pyridyl, 3-pyridyl, 4-pyridyl, pyrimidin-2-yl, pyrimidin-4-yl, thiazol-4-yl or 1H-1,2,4-triazol-3-yl; either    R10 = halo, cyano, azido, nitro, -SCN, SF5, 1-6C-alkyl, 1-6C-haloalkyl, 1-6C-alkoxy-1-6C-alkyl, 3-8C cycloalkyl, 3-8C-halocycloalkyl, 2-6C-alkenyl, 2-6C-haloalkenyl, 2-6C-alkynyl, 2-6C-haloalkynyl, -Si(R17)2R18, -OR11, -OSO2R11, -SR11, -S(O)mR11, -S(O)nN(R12)R13, -N(R12)R13, -C(=O)N(R12)R13, -C(=S)N(R12)R13, -C(=O)OR11, phenyl (optionally substituted by 1-5 radicals of R14), or 3-7 membered optionally saturated, partially 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 R14;    R10R10 = =CR15R16, =S(O)mR11, =S(O)mN(R12)R13, =NR12, =NOR11 or =NNR12; or    CR10R10 = 3-8 membered saturated or partially unsaturated carbocyclic or heterocyclic ring containing 1-3 heteroatoms or heteroatom groups comprising N, O, S, NO, SO or SO2 as ring members; either    R11, R14 = 1-6C-alkyl, 2-6C-alkenyl, 2-6C-alkynyl, 3-8C-cycloalkyl (all are unsubstituted, partially or fully halogenated and/or one or two CH2 groups may be replaced by a CO group, and/or may carry 1 or 2 radicals comprising 1-6C-alkoxy, 1-6C-haloalkoxy, 1-6C-alkylthio, 1-6C-haloalkylthio, 1-6C-alkylsulfinyl, 1-6C-haloalkylsulfinyl, 1-6C-alkylsulfonyl, 1-6C-haloalkylsulfonyl, 1-6C-alkoxycarbonyl, trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl, phenyl, benzyl, pyridyl or phenoxy), H or cyano, where phenyl, benzyl, pyridyl or phenoxy is optionally or partially halogenated and optionally substituted 1-3 substituents comprising 1-6C-alkyl, 1-6C-haloalkyl, 1-6C-alkoxy, 1-6C haloalkoxy or 1-6C-alkoxycarbonyl; or    R14R14 = =C(1-4C-alkyl)2, =N(1-6C-alkyl), =NO(1-6C-alkyl) or =O; or    NR14R14 = 3-7 membered saturated, partly unsaturated or completely unsaturated heterocyclic ring which may contain 1 or 2 further heteroatoms comprising N, O and S as ring members, where the heterocyclic ring may carry 1-4 substituents comprising halo, 1-4C-haloalkyl, 1-4C-alkoxy or 1-4C-haloalkoxy; either    R12, R13 = 1-6C-alkyl, 2-6C-alkenyl, 2-6C-alkynyl, 3-8C-cycloalkyl (all are unsubstituted, partially or fully halogenated and/or one or two CH2 groups may be replaced by a CO group, and/or may carry 1 or 2 radicals comprising 1-6C-alkoxy, 1-6C-haloalkoxy, 1-6C-alkylthio, 1-6C-haloalkylthio, 1-6C-alkylsulfonyl, 1-6C-alkoxycarbonyl, trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl, phenyl, benzyl, pyridyl or phenoxy), H or cyano, where phenyl, benzyl, pyridyl or phenoxy is optionally or partially halogenated and optionally substituted 1-3 substituents comprising 1-6C-alkyl, 1-6C-haloalkyl, 1-6C-alkoxy, 1-6C haloalkoxy or 1-6C-alkoxycarbonyl; or    NR12R13 = 3-7 membered saturated, partly unsaturated or completely unsaturated heterocyclic ring which may contain 1 or 2 further heteroatoms comprising N, O and S as ring members, where the heterocyclic ring may carry 1-4 substituents comprising halo, 1-4C-alkyl, 1-4C-haloalkyl, 1-4C-alkoxy or 1-4C-haloalkoxy; either    R15, R16 = 1-6C-alkyl, 2-6C-alkenyl, 2-6C-alkynyl, 3-8C-cycloalkyl (all are unsubstituted, partially or fully halogenated or oxygenated and/or may carry 1 or 2 radicals comprising 1-4C alkyl, 1-4C haloalkyl, 1-6C-alkoxy, 1-6C-haloalkoxy, 1-6C-alkylthio, 1-6C-haloalkylthio, 1-6C-alkylsulfinyl, 1-6C-alkylsulfonyl, trimethylsilyl, triethylsilyl, tert-butyldimethylsilyl, OH, SH, phenyl, benzyl, pyridyl or phenoxy), H, halo, cyano, azido, nitro, -SCN or SF5, where phenyl, benzyl, pyridyl or phenoxy is optionally or partially halogenated and optionally substituted 1-3 substituents comprising 1-6C-alkyl, 1-6C-haloalkyl, 1-6C-alkoxy, 1-6C haloalkoxy, 1-6C-alkoxycarbony, (1-6C-alkyl)amino or di-(1-6C-alkyl)amino; or    R15R16 = =C(1-4C-alkyl)2, =N(1-6C-alkyl), =NO(1-6C-alkyl) or =O;    R17, R18 = 1-4C-alkyl, 3-6C-cycloalkyl, 1-4C-alkoxy-1-4C-alkyl, phenyl or benzyl; and    R9 = H, CH3, CH2CH3, CH2CH2CH3, C(=O)CH3 or C(=O)OCH3.    Preferred Definitions:    R1 = CH3, CF3, CH2CH3, CH2CF3, Cl, Br, I, CN, NO2, SF5, OCH3, OCF3 or OCHF2;    n = 1;    R2 = F, Cl, CN or CF3; and    m = 2 or 3.    ACTIVITY - Pesticide.    MECHANISM OF ACTION - None given.    SPECIFIC COMPOUNDS - Preparation of 4-bromo-3-methyl-benzaldehyde oxime of formula (Ia) is disclosed as (I).    EXAMPLE - Paraformaldehyde (5.4 g) was added to 140 ml of water in a reaction flask as well as hydroxylamine hydrochloride (12.5 g). The reaction mixture was heated (90 degrees C bath temperature) until it became a clear solution. After cooling to room temperature, sodium acetate (40.8 g) was added and the mixture was again heated to reflux for 10 minutes to obtain a solution-1 having pH of 5.5. 4-Bromo-3-methyl-phenylamine (22.3 g), 40 ml of water and 80 g of crashed ice were placed into a four-necked reaction flask. Hydrochloric acid (45.6 ml) was added with cooling (-10 degrees C) as well as a solution of sodium nitrite (8.3 g) in 20 ml of water dropwise at such a rate that the reaction mixture did not exceed a temperature of +5 degrees C. During addition the reaction was vigorously stirred with a mechanical stirrer. After the reaction mixture was allowed to be stirred for additional 15 minutes at the same temperature a solution of sodium acetate (22 g) was added resulting in a solution-2 of a final pH value of 4.10. The second solution was stirred for another 10-15 minutes at 5-10 degrees C before it was used in the reaction with solution-1. Solution-1 was transferred into a reaction flask and treated with a solution comprising copper sulfate pentahydrate (3 g), sodium sulfite (0.44 g) and sodium acetate (132 g) in water (220 ml) at 10-15 degrees C. Solution-2 was added slowly. During the addition the reaction mixture was foaming which was minimized by intensive stirring. Throughout the addition of solution-2 the pH was maintained above 5. After addition, the reaction mixture was allowed to come slowly to room temperature and stirring was continued for about 2 hours and worked up to give 4-bromo-3-methyl-benzaldehyde oxime (19,2 g, 75%).