Abstract: The invention relates to a rodenticidal bait by ingestion for at least one target harmful rodent ingesting this bait for an ingestion period, called consumption time, imposed owing to said ingestion; the rodenticidal bait comprising: a composition, called composition of AVK(s), of at least one compound that inhibits vitamin K recycling; a composition, called vitamin D composition, of at least one hypercalcaemia-causing vitamin D, and at least one excipient that is edible for target harmful rodents; characterized in that: said composition of AVK(s) is present in the rodenticidal bait in a proportion by weight, called proportion of AVK(s) by weight, that is not zero and is not lethal on its own for any target harmful rodent, and in that said vitamin D composition is present in the rodenticidal bait in a proportion by weight, called the proportion of vitamin D by weight: sufficient for said vitamin D composition to be lethal on its own for at least one target harmful rodent, and below a minimum proportion

Abstract: Disclosed is a laevorotatory enantiomer of the configurational stereoisomer of difethialone, named homo-stereoisomer, the formula of which is 3-(4?-bromobiphenyl-4-yl)-1-(4-hydroxythiocoumarin-3-yl)-1,2,3,4-tetrahydronaphthalene, in which carbons 1 and 3 of the 1,2,3,4-tetrahydronaphthalene group have the same absolute configuration.

Abstract: Disclosed is a dextrorotatory enantiomer of the configurational stereoisomer of difethialone, named homo-stereoisomer, the formula of which is 3-(4?-bromobiphenyl-4-yl)-1-(4-hydroxythiocoumarin-3-yl)-1,2,3,4-tetrahydronaphthalene, in which carbons 1 and 3 of the 1,2,3,4-tetrahydronaphthalene group of the homo-stereoisomer have the same absolute configuration.

Abstract: Disclosed is a configurational stereoisomer, named enantiomer E1, of bromadiolone having, by chromatographic analysis of bromadiolone including four configurational stereoisomers of bromadiolone performed under the conditions described below, a retention time t1 having a value such that t1<t2<t3<t4; t2, t3 and t4 being the retention times of the configurational stereoisomers of bromadiolone different from the enantiomer E1, the analysis being performed at a temperature of 27.3° C.

Abstract: Disclosed is a composition including flocoumafen and an amount of a configurational stereoisomer of flocoumafen, named enantiomer E4, such that the ratio of this amount to the amount of flocoumafen in the composition is less than 10%, the enantiomer E4 being present with the exclusion of a racemic mixture, the enantiomer E4 having, by chromatographic analysis of flocoumafen, a retention time t4 having a value such that t1<t2<t3<t4; t1, t2 and t3 representing the retention times of the configurational stereoisomers of flocoumafen different from the enantiomer E4, the chromatographic analysis being performed at a temperature of 23.5° C.

Abstract: Disclosed is to a composition including difethialone, containing a configurational stereoisomer of difethialone, referred to as a hetero-stereoisomer, of formula 3-(4?-bromobiphenyl-4-yl)-1-(4-hydroxythiocoumarin-3-yl)-1,2,3,4-tetrahydronaphthalene, in which the carbon atoms 1 and 3 of the 1,2,3,4-tetrahydronaphthalene group have different absolute configurations, the composition including an amount of a dextrorotatory enantiomer of the hetero-stereoisomer such that the ratio of this amount to the amount of difethialone in the composition is less than 10%; the amount of the dextrorotatory enantiomer of the hetero-stereoisomer of difethialone in the composition being different from the amount of levorotatory enantiomer of the hetero-stereoisomer of difethialone in the composition.

Abstract: Disclosed is to a laevorotatory enantiomer of the configurational stereoisomer of difethialone, named hetero-stereoisomer, the formula of which is 3-(4?-bromobiphenyl-4-yl)-1-(4-hydroxythiocoumarin-3-yl)-1,2,3,4-tetrahydronaphthalene, in which carbons 1 and 3 of the 1,2,3,4-tetrahydronaphthalene group have different absolute configurations.

Abstract: Disclosed is a dextrorotatory enantiomer of a configurational stereoisomer of difethialone, named hetero-stereoisomer, the formula of which is 3-(4?-bromobiphenyl-4-yl)-1-(4-hydroxythiocoumarin-3-yl)-1,2,3,4-tetrahydronaphthalene, in which carbons 1 and 3 of the 1,2,3,4-tetrahydronaphthalene group have different absolute configurations.

Abstract: Disclosed is a laevorotatory enantiomer of the configurational stereoisomer of difethialone, named homo-stereoisomer, the formula of which is 3-(4?-bromobiphenyl-4-yl)-1-(4-hydroxythiocoumarin-3-yl)-1,2,3,4-tetrahydronaphthalene, in which carbons 1 and 3 of the 1,2,3,4-tetrahydronaphthalene group have the same absolute configuration.

Abstract: Disclosed is a configurational stereoisomer, referred to as enantiomer E4, of flocoumafen, the enantiomer E4 having, as determined by the chromatographic analysis of flocoumafen including four configurational stereoisomers of flocoumafen, carried out under conditions described hereinafter, a retention time t4 with a value such that t1<t2<t3<t4; t1, t2 and t3 representing the retention times of the configurational stereoisomers of flocoumafen different from the enantiomer E4, the analysis being carried out at a temperature of 23.5° C.

Abstract: Disclosed is a configurational stereoisomer, named enantiomer E1, of flocoumafen, the enantiomer E1 having, by chromatographic analysis of flocoumafen performed under particular conditions, a retention time t1 having a value such that t1<t2<t3<t4; t2, t3 and t4 representing the retention times of the configurational stereoisomers of flocoumafen different from the enantiomer E1, the analysis being performed at a temperature of 23.5° C.

Abstract: Disclosed is a configurational stereoisomer, referred to as enantiomer E4, of bromadiolone, having, as determined by the chromatographic analysis carried out under conditions described hereinafter, a retention time t4 with a value such that t1<t2<t3<t4; t1, t2 and t3 representing the retention times of each configurational stereoisomer of bromadiolone different from the enantiomer E4, the analysis being carried out at a temperature of 27.3° C.

Abstract: Disclosed is a configurational stereoisomer, named enantiomer E3, of flocoumafen, the enantiomer E3 having, by chromatographic analysis of flocoumafen performed under particular conditions, a retention time t3 having a value such that t1<t2<t3<t4; t1, t2 and t4 representing the retention times of the configurational stereoisomers of flocoumafen different from the enantiomer E3, the analysis being performed at a temperature of 23.5° C.

Abstract: Disclosed is a configurational stereoisomer, named enantiomer E3, of bromadiolone having, by chromatographic analysis of a bromadiolone composition including four configurational stereoisomers of bromadiolone performed under the conditions described hereinbelow, a retention time t3 having a value such that t1<t2<t3<t4; t1, t2 and t4 being the retention times of the configurational stereoisomers of bromadiolone different from the enantiomer E3, the analysis being performed at a temperature of 27.3° C.

Abstract: Disclosed is a configurational stereoisomer, referred to as enantiomer E2, of flocoumafen, the enantiomer E2 having, as determined by the chromatographic analysis of a flocoumafen composition including four configurational stereoisomers of flocoumafen, carried out under conditions described hereinafter, a retention time t2 with a value such that t1<t2<t3<t4; t1, t3 and t4 representing the retention times of the configurational stereoisomers of flocoumafen different from the enantiomer E2, the chromatographic analysis being carried out at a temperature of 23.5° C.

Abstract: Disclosed is to a composition including difethialone, containing a configurational stereoisomer of difethialone, referred to as a hetero-stereoisomer, of formula 3-(4?-bromobiphenyl-4-yl)-1-(4-hydroxythiocoumarin-3-yl)-1,2,3,4-tetrahydronaphthalene, in which the carbon atoms 1 and 3 of the 1,2,3,4-tetrahydronaphthalene group have different absolute configurations, the composition including an amount of a dextrorotatory enantiomer of the hetero-stereoisomer such that the ratio of this amount to the amount of difethialone in the composition is less than 10%; the amount of the dextrorotatory enantiomer of the hetero-stereoisomer of difethialone in the composition being different from the amount of levorotatory enantiomer of the hetero-stereoisomer of difethialone in the composition.

Abstract: Disclosed is a configurational stereoisomer, named enantiomer E1, of bromadiolone having, by chromatographic analysis of bromadiolone including four configurational stereoisomers of bromadiolone performed under the conditions described below, a retention time t1 having a value such that t1<t2<t3<t4; t2, t3 and t4 being the retention times of the configurational stereoisomers of bromadiolone different from the enantiomer E1, the analysis being performed at a temperature of 27.3° C.

Abstract: Disclosed is to a laevorotatory enantiomer of the configurational stereoisomer of difethialone, named hetero-stereoisomer, the formula of which is 3-(4?-bromobiphenyl-4-yl)-1-(4-hydroxythiocoumarin-3-yl)-1,2,3,4-tetrahydronaphthalene, in which carbons 1 and 3 of the 1,2,3,4-tetrahydronaphthalene group have different absolute configurations.

Abstract: Disclosed is a composition including flocoumafen and an amount of a configurational stereoisomer of flocoumafen, named enantiomer E4, such that the ratio of this amount to the amount of flocoumafen in the composition is less than 10%, the enantiomer E4 being present with the exclusion of a racemic mixture, the enantiomer E4 having, by chromatographic analysis of flocoumafen, a retention time t4 having a value such that t1<t2<t3<t4; t1, t2 and t3 representing the retention times of the configurational stereoisomers of flocoumafen different from the enantiomer E4, the chromatographic analysis being performed at a temperature of 23.5° C.

Abstract: A rodenticidal bait composition includes bromadiolone mainly in the form of the homostereoisomer of formula 3-[3-(4?-bromo-[1,1?-biphenyl]-4-yl)-3-hydroxy-1-phenylpropyl]-4-hydroxy-2H-1-benzopyran-2-one, where carbons 1 and 3 of the 3-hydroxy-1-phenylpropyl group have the same absolute configuration. A method for controlling rodent pests using the rodenticidal bait is also described.