Ethynylphenylamidine compound or salt thereof, method for producing same, and fungicide for agricultural and horticultural use

An ethynylaniline compound represented by Formula (4):

• wherein R4 and R6 are each halogen or C1-4 alkyl;
• R5 and R7 are each hydrogen;
• and
• R8 is hydrogen;
• C1-20 alkyl optionally substituted on the alkyl group with one or more substituents independently selected from the group consisting of C1-4 alkoxy, hydroxy, cyano, phenyl, phenoxy, and optionally substituted heterocyclic groups;
• C3-8 cycloalkyl;
• C1-4 haloalkyl;
• phenyl optionally substituted on the phenyl ring with one to five substituents independently selected from the group consisting of halogen, C1-6 alkyl, C1-4 haloalkyl, C1-4 alkoxy, and phenoxy;
• a heterocyclic group optionally substituted on the heterocyclic ring with one or more substituents independently selected from the group consisting of halogen, C1-4 alkyl, C1-4 haloalkyl, and optionally substituted heterocyclic groups;
• or —(CH2)n-Si(R9)(R10)(R11) wherein R9, R10, and R11 are each C1-6 alkyl, and n is an integer of 0 or 1.