Fungicidal 5-phenyl substituted 2-(cyanoamino) pyrimidines

A pyrimidine compound of formula I

• in which
• R1 represents C1-C10-alkyl, C1-C10-haloalkyl, C2-C6-alkenyl, C2-C6-alkynyl, C4-C8-alkadienyl, C1-C10-alkoxy, C3-C8-cycloalkly, phenyl, tri-C1--C6-alkyl-silyl, formyl or C1-C10-alkoxy-carbonyl, wherein R1 groups are unsubstituted or substituted by one to three groups Ra;
• Ra is halogen, nitro, cyano, hydroxy, or
• is C1-C10-alkyl, C3-C6-cycloalkyl, C3-C6-cycloalkenyl, C1-C10-haloalkyl, C3-C6-halocycloalkyl, C1-C10-alkoxy, C1-C10-haloalkoxy, C1-C10-alkoxycarbonyl, tri-C1--C4-alkyl-silyl, phenyl, halo- or dihalophenyl;
• R2 represents phenyl or C3-C6-cycloalkyl, which are unsubstituted or substituted by one to three groups Ra;
• R3 represents hydrogen, halogen, or is C1-C10-alkyl, C1-C10-alkoxy, C1-C10-alkylthio, C1-C10-alkylamino or di-C1-C10-alkylamino, which are unsubstituted or substituted by one to three groups Ra;
• R4 represents C1-C10-alkyl, C2-C6-alkenyl or C2-C6-alkynyl, which are unsubstituted or substituted by one to three groups Ra;
• and
• X represents O, S, NR5 or a single bond, wherein R5 represents hydrogen, C1-C10-alkyl or C1-C10-haloalkyl;
• or
• R1 and R5 together with the interjacent nitrogen atom form a heterocyclic ring selected from the group consisting of pyrrolidine, piperidine, tetrahydropyridine and azepane, which ring is optionally substituted by one or more C1-C10-alkyl groups.