TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (I) comprises reacting an alkylene compound of formula (H-C?=C-CH(D1)(R3)) (II) with a carbonyl compound of formula (B1-C(=O)-LG) (III) optionally in the presence of a diluent and a basic auxiliary agent to obtain an alkylene compound of formula (C(=O)(B1)-C?=C(D1)(R3)) (IV); and reacting (IV) with an amide compound of formula (HN(R1)-CH2-A) (V) optionally in the presence of a diluent.LG = halo-1-8C-alkyl, 1-8C-alkanoyloxy, mercapto, 1-8C-alkylthio, halo-1-8C-alkylthio or halo. Preferred Definitions:    A = pyrid-3-yl (optionally substituted in 6th-position by F, Cl, Br, CH3, CF3 or CH3O), preferably 5,6-dibromo-pyrid-3-yl, 6-bromo-5-chloro-pyrid-3-yl, 6-bromo-5-fluoro-pyrid-3-yl, 5-chloro-6-iodo-pyrid-3-yl, 5,6-dichloro-pyrid-3-yl, 6-chloro-5-fluoro-pyrid-3-yl, 5-bromo-6-chloro-pyrid-3-yl, 6-chloro-5-methyl-pyrid-3-yl, 6-chloro-5-difluoromethyl-pyrid-3-yl, 6-chloro-1,4-pyridazin-3-yl, 2-chloro-pyrimid-5-yl, 2-chloro-1,3-thiazol-5-yl, 6-trifluoromethoxypyrid-3-yl, 6-chloro-1,4-pyridazin-3-yl, 6-methyl-1,4-pyridazin-3-yl, 2-chloro-1,3-thiazol-5 yl, 2-methyl-1,3-thiazol-5-yl, 2-chloro-pyrazin-5-yl or 2-chloro-1,3-thiazol-5-yl;    B1 = OCH3, OCH2CH3, or OCH(CH3)2;    D1 = T-R5;    R5 = methylcarbonyl, ethylcarbonyl, tert-butylcarbonyl or methoxycarbonyl;    T = O;    R1 = CH3, cyclopropyl or 2,2-difluoro-ethyl; and    R2, R3 = H.    ACTIVITY - Insecticide; Arachnicide; Anthelmintic; Nematocide; Acaricide; Fungicide; Antibacterial; Virucide; Herbicide; Antifouling; Plant Growth Regulant.    MECHANISM OF ACTION - None given.    ADMINISTRATION - Application of (I) is via immersing, spraying, vaporizing, covering by a smoke screen, scattering, spreading or injecting. No dosage details given.    SPECIFIC COMPOUNDS - 19 Compounds (I) are disclosed e.g. 4-acetoxy-3-((6-chloro-pyrid-3-ylmethyl)amino)-but-2-en-carboxylic acid-iso-propylester of formula (Ia), 3-((6-chloro-pyridin-3-ylmethyl)-amino)-4-methoxycarbonyloxy-pent-2-enoic acid methyl ester, 4-acetoxy-3-((6-chloro-pyridin-3-ylmethyl)-amino)-pent-2-enoic acid methyl ester and 3-((6-chloro-pyridin-3-ylmethyl)-amino)-4-isopropoxy-pent-2-enoic acid methyl ester.    EXAMPLE - To a solution of 4-acetoxybut-2-in-carboxylic acid-iso-propylester (124 mg) in water-free tetrahydrofuran (5 ml), 1-(6-chloropyridin-3-yl)-N-methylmethanamine (116 mg) dissolved in water-free tetrahydrofuran (1 ml) was added and stirred for 16 hours. Subsequently the obtained residue was washed with toluene, diluted with aqueous sulfuric acid and sodium bicarbonate solution, dried over magnesium sulfate and the organic phase was concentrated under vacuum to obtain 4-acetoxy-3-((6-chloro-pyrid-3-ylmethyl)amino)-but-2-en-carboxylic acid-iso-propylester (120 mg).