Dihalopropene compounds, process for their preparation, compositions comprising them and their use as pesticidesWhat is described are dihalopropene compounds of the formula (I) in which R1 and R2 are halogen, Y is —O—, —S— or —NH—, X is —O—, —S(O)r— or —NR5— (where r=0, 1, 2 and R5 is hydrogen or C1-C8-alkyl), X′ is a direct C—C bond, —O—, —S(O)r— or —NR5— (where R5 is as defined above), R3 is hydrogen, halogen, nitro, cyano, C1-C8-alkyl, C1-C8-haloalkyl, C1-C8-alkoxy, C1-C8-haloalkoxy, C3-C10-cycloalkyl or has one of the meanings defined for A, A has the meaning given in the description (inter alia aryl, heterocyclyl), B is a divalent bridge having the meanings given in the description (inter alia alkylene) and R4 is a monovalent C6-C14-aryl radical or nitrogen-containing heteroaryl radical having at least one ring heteroatom which has the meanings given in the description. These compounds can be used for preparing pesticides.