Imidazole derivatives and fungicidal composition containing the same

An imidazole derivative of the general formula ##STR250## wherein R.sub.1 is naphthyl group, an arylalkyl group, a cycloalkyl group, a cycloalkylalkyl group, an alkyl group, a lower alkenyl group, a lower alkoxy-lower alkyl group, a phenylthio-lower alkyl group or phenyl group;

• the phenyl group being unsubstituted or substituted with 1 to 5 substituents which is or are the same or different from each other and selected from a halogen atom, nitro group, cyano group, a lower alkyl group, a lower alkenyl group, a halogenated lower alkyl group, a lower alkoxyl group, a lower alkenyloxy group, a lower alkylthio group, a lower alkylsulfinyl group, a lower alkylsulfonyl group, a lower alkylcarbonyl group, phenyl group, phenoxy group, a halogen-substituted phenoxy group, phenylthio group, a lower alkyl-substituted phenylthio group and a nitro-substituted phenylthio group;
• R.sub.2 is a saturated alkyl group, an unsaturated alkyl group, a lower alkoxy-lower alkyl group, a lower alkylthio-lower alkyl group, a phenoxy-lower alkyl group, a phenylthio-lower alkyl group, a mono- or di-lower alkylamino-lower alkyl group, a lower alkyl group substituted with a group --N(CH.sub.2).sub.n where n is an integer of 2 to 6, a lower alkylcarbonyl group, phenylcarbonyl group, a cycloalkyl group, a cycloalkylalkyl group, a halogenated lower alkyl group, a cyano-lower alkyl group, a lower alkoxycarbonyl-lower alkyl group, a lower alkylthiocarbonyl-lower alkyl group, an arylalkyl group, a lower alkylcarbonyl-lower alkyl group, a phenylcarbonyl-lower alkyl group, naphthyl group, furfuryl group or phenyl group;
• the latter phenyl group being unsubstituted or substituted with a substitutent which is selected from a halogen atom, nitro group, cyano group and a lower alkyl group;
• X is an oxygen atom or a sulfur atom;
• and
• Y is a straight or branched saturated alkylene group or unsaturated alkylene group, the saturated alkylene group being unsubstituted or substituted with a halogen group, a lower alkoxyl group, cyano group, phenyl group, a halogen-substituted phenyl group, a nitro-substituted phenyl group, a lower alkyl-substituted phenyl group and/or trifluoromethyl-substituted phenyl group, and a salt of said imidazole derivative.