NOVELTY - Preparing N-substituted 1H-pyrazole-5-carboxylate compounds (IA), comprises (a) deprotonating substituted 2-pyrazol-1-yl-pyridine compounds (II) with a magnesium-organic base having a carbon bound magnesium, and (b) subjecting the obtained product to a carboxylation by reacting it with carbon dioxide or a carbon dioxide equivalent, to obtain (IA).    USE - The process is useful for preparing N-substituted 1H-pyrazole-5-carboxylate compounds which are used for preparing sulfimine compounds (all claimed) which are used as pesticides. No biological data given.    ADVANTAGE - The process: provides high yields with few byproducts, which saves time, resources and energy; is simple and suitable for industrial scale production; and is inexpensive and safe.    DETAILED DESCRIPTION - Preparing N-substituted 1H-pyrazole-5-carboxylate compounds of formula (IA), comprises (a) deprotonating substituted 2-pyrazol-1-yl-pyridine compounds of formula (II) with a magnesium-organic base having a carbon bound magnesium, and (b) subjecting the obtained product to a carboxylation by reacting it with carbon dioxide or a carbon dioxide equivalent, to obtain (IA).    R1 = 1-6C alkyl, 1-6C fluoroalkyl, 3-8C cycloalkyl, 3-8 fluorocycloalkyl, 2-6C alkenyl, 2-6C fluoroalkenyl (all optionally substituted by at least one Q1, 3-7 membered optionally saturated, aromatic heterocyclyl containing 1-3 N, O, S, NO, SO or SO2 (where the heterocyclyl is optionally substituted by at least one R1e), or T1), H, halo, CN, -SF5 or CBrF2;    T1 = R1a, -Si(R1f)2R1g, -OR1b, -SR1b, -S(O)mR1b, -S(O)nN(R1c)R1d or -N(R2c)R2d;    Q1 = phenyl (optionally substituted by 1-5 R1e);    R2 = 1-6C alkyl, 1-6C fluoroalkyl, 3-8C cycloalkyl, 3-8C fluorocycloalkyl, 2-6C alkenyl, 2-6C fluoroalkenyl (all optionally substituted by at least one Q1, Q3 or T1), halo or SF5;    Q3 = 3-7 membered optionally saturated, heterocyclyl containing 1-3 N, O, S, NO, SO or SO2 (where the heterocyclyl is optionally substituted by at least one R1e); either    R1a = Q1, Q3, SF5, 1-6C alkyl, 1-6C fluoroalkyl, 1-6C alkoxy-(1-6C alkyl), 3-8C cycloalkyl, 3-8C fluorocycloalkyl, 2-6C alkenyl, 2-6C fluoroalkenyl, -Si(R1f)2R1g, -OR1b, -SR1b, -S(O)mR1b, -S(O)nN(R1c)R1d or -N(R2c)R2d); or    R1a+R1a (geminally bound) = (=CR1hR1i), (=NR2c), (=NOR1b) or (=NNR2c); or    C(R1a+R1a) = 3-8 membered optionally saturated carbocyclyl or heterocyclyl containing 1-3 N, O, S, NO, SO or SO2;    R1b = 1-6C alkyl, 1-6C fluoroalkyl, 2-6C alkenyl, 2-6C fluoroalkenyl, 3-8C cycloalkyl or 3-8C fluorocycloalkyl (all optionally carry 1 or 2 Q2, 1-6C alkoxy, 1-6C fluoroalkoxy, 1-6C alkylthio, 1-6C fluoroalkylthio, 1-6C alkylsulfinyl, 1-6C fluoroalkylsulfinyl, 1-6C alkylsulfonyl, 1-6C fluoroalkylsulfonyl or -Si(R1f)2R1g);    Q2 = phenyl, benzyl, pyridyl or phenoxy (all optionally halogenated and/or optionally carry 1-3 1-6C alkyl, 1-6C fluoroalkyl, 1-6C alkoxy or 1-6C fluoroalkoxy); either    R1c, R1d = 1-6C alkyl, 1-6C fluoroalkyl, 2-6C alkenyl, 2-6C fluoroalkenyl, 3-8C cycloalkyl, 3-8C fluorocycloalkyl (all optionally carry 1 or 2 Q2, 1-6C alkoxy, 1-6C fluoroalkoxy, 1-6C alkylthio, 1-6C fluoroalkylthio, 1-6C alkylsulfinyl, 1-6C alkylsulfonyl or -Si(R1f)2R1g), or CN; or    NR1c+R1d = 3-7 membered optionally saturated, heterocyclyl which may contain 1 or 2 N, O or S (where the heterocyclyl may carry 1-4 halo, 1-4C alkyl, 1-4C fluoroalkyl, 1-4C alkoxy or 1-4C fluoroalkoxy);    R2c = H or R1c;    R2d = H or R1d;    R1e = 1-6C alkyl, 1-6C fluoroalkyl, 2-6C alkenyl, 2-6C fluoroalkenyl, 3-8C cycloalkyl, 3-8C fluorocycloalkyl (all optionally carry 1 or 2 Q2, 1-4C alkoxy, 1-6C alkoxy, 1-6C fluoroalkoxy, 1-6C alkylthio, 1-6C fluoroalkylthio, 1-6C alkylsulfinyl, 1-6C fluoroalkylsulfinyl, 1-6C alkylsulfonyl, 1-6C fluoroalkylsulfonyl or -Si(R1f)2R1g) or halo;    R1f, R1g = 1-4C alkyl, 3-6C cycloalkyl, 1-4C alkoxy-(1-4C alkyl), phenyl or benzyl;    R1h, R1i = 1-6C alkyl, 1-6C fluoroalkyl, 2-6C alkenyl, 2-6C fluoroalkenyl, 3-8C cycloalkyl, 3-8C fluorocycloalkyl (all optionally carry 1 or 2 phenyl, benzyl, pyridyl, phenoxy (all optionally halogenated and/or may carry 1-3 1-6C alkyl, 1-6C fluoroalkyl, 1-6C alkoxy, 1-6C fluoroalkoxy, (1-6C alkoxy)carbonyl, (1-6C alkyl)amino or di-(1-6C alkyl)amino), 1-4C alkyl, 1-4C fluoroalkyl, 1-6C alkoxy, 1-6C fluoroalkoxy, 1-6C alkylthio, 1-6C fluoroalkylthio, 1-6C alkylsulfinyl, 1-6C alkylsulfonyl or -Si(R1f)2R1g), H, halo or SF5;    m = 1 or 2;    r = 0-4;    n = 0-2; and    M+ = cation or cation equivalent compensating the charge of the carboxylate.    INDEPENDENT CLAIMS are also included for:    (1) preparing sulfimine compounds of formula (VI), comprising providing carbonylchloride compounds of formula (I) and subsequently reacting (I) with substituted sulfimine compounds of formula (VII) in the presence of a base, to obtain (VI); and    (2) N-substituted 1H-pyrazole-5-carboxylate compounds (IA), where M+ is a magnesium.    R3, R4 = 1-6C alkyl, 1-6C haloalkyl, 3-8C cycloalkyl, 3-8C halocycloalkyl, 2-6C alkenyl, 2-6C haloalkenyl, 2-6C alkynyl, 2-6C haloalkynyl (all optionally substituted by at least one Q1, Q3, R1a, -Si(R1f)2R1g, -OR2b, -OS(O)nR2b, -SR2b, -S(O)mR2b, -S(O)nN(R2c)R2d, -N(R2c)R2d, -N(R2c)C(O)R1a, -C(O)R1a, -C(O)OR2b, -C(=S)R1a, -C(=S)OR2b, -C(=NR2c)R1a, -C(=O)N(R2c)R2d or -C(=S)N(R2c)R2d), halo, CN, azido, nitro, -SCN or SF5;    R5 = 1-10C alkyl, 1-10C haloalkyl, 3-8C cycloalkyl, 3-8C halocycloalkyl, 2-10C alkenyl, 2-10C haloalkenyl, 2-10C alkynyl, 2-10C haloalkynyl (all optionally substituted by at least one Q1, Q3, R1a, -Si(R1f)2R1g, -OR2b, -SR2b, -S(O)mR2b, -S(O)nN(R2c)R2d, -N(R2c)R2d, -C(O)R1a, -C(O)OR2b, -C(=S)R1a, -C(=S)OR2b, -C(=NR2c)R1a, -C(=O)N(R2c)R2d or -C(=S)N(R2c)R2d), H or CN; either    R6, R7 = 1-10C alkyl, 1-10C haloalkyl, 3-8C cycloalkyl, 3-8C halocycloalkyl, 2-10C alkenyl, 2-10C haloalkenyl, 2-10C alkynyl, 2-10C haloalkynyl (all optionally substituted by at least one R1a) or H; or    R6+R7 = 2-7C alkylene, 2-7C alkenylene or 6-9C alkynylene chain forming together with S to which they are attached 3-10 membered optionally saturated ring, where 1-4 of CH2 groups in the 2-7C alkylene chain or 1-4 of any of CH2 or CH groups in the 2-7C alkenylene chain or 1-4 of any of CH2 groups in the 6-9C alkynylene chain are optionally replaced by 1-4 C=O, C=S, O, S, N, NO, SO, SO2 or NH, and C and/or N in the 2-7C alkylene, 2-7C alkenylene or 6-9C alkynylene chain is optionally substituted with 1-5 halo, CN, 1-6C alkyl, 1-6C haloalkyl, 1-6C alkoxy, 1-6C haloalkoxy, 1-6C alkylthio, 1-6C haloalkylthio, 3-8C cycloalkyl, 3-8C halocycloalkyl, 2-6C alkenyl, 2-6C haloalkenyl, 2-6C alkynyl or 2-6C haloalkynyl;    R2b = H or R1b; and    t = 0 or 1.