Biocidal benzylbiphenyl derivatives

A compound of formula (I)

• a stereochemically isomeric form thereof, an acid or base addition salt thereof, an N-oxide thereof, or a quaternary ammonium derivative thereof,
• wherein
• the dotted line is an optional bond;
• X is a direct bond when the dotted line represents a bond, or
• X is hydrogen or hydroxy, when the dotted line does not represent a bond;
• R1 and R2 are each independently selected from hydrogen, halo, hydroxy, C1-4alkyl, C1-4alkyloxy, nitro, amino, cyano, trifluoromethyl, trifluoromethoxy, C1-6alkylcarbonyl hydroxycarbonyl, C1-6alkyloxycarbonyl, aminocarbonyl, di(C1-4alkyl)aminocarbonyl, C1-6alkylsulfinyl, C1-6alkylsulfonyl, aminosulfonyl, di(C1-4alkyl)aminosulfonyl, or —SO3H;
• R3 and R4 are each independently selected from hydrogen, halo, hydroxy, C1-4alkyl, C1-4alkyloxy, nitro, amino, cyano, trifluoromethyl, or trifluoromethoxy;
• R5 and R6 are each independently selected from hydrogen, halo, hydroxy, C1-4alkyl, C1-4alkyloxy, nitro, amino, cyano, trifluoromethyl, trifluoromethoxy, C1-6alkylcarbonyl, hydroxycarbonyl, C1-6alkyloxycarbonyl, aminocarbonyl, di(C1-4alkyl)aminocarbonyl, C1-6alkylsulfinyl, C1-6alkylsulfonyl, aminosulfonyl, di(C1-4alkyl)aminosulfonyl, or —SO3H,
• L is a radical of formula
• wherein
• A1 is a direct bond or C1-6alkanediyl;
• A2 is C2-6alkanediyl;
• R7 is hydrogen, C1-4alkyl, phenyl or benzyl;
• R8 and R9 are each independently hydrogen, C1-6alkyl, aminoC1-6alkyl or mono- or di(C1-4alkyl)aminoC1-6alkyl;
• R10 is hydrogen, C1-6alkyl, aminoC1-6alkyl or mono- or di(C1-4alkyl)aminoC1-6alkyl;
• and
• R11 is hydrogen, C1-6alkyl, amino, aminoC1-6alkyl or mono- or di(C1-4alkyl)aminoC1-6alkyl;
• provided that when L is a radical of formula (a-9) then R11 is other than hydrogen.