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A series of 2-phenyliminothiazolidines has been successfully synthesized; and 2-(2-methylphenyl)iminothiazolidine(Ⅰa) and 2-(4-methylphenyl) iminothiazolidine(Ⅰb) have been selected to determine their crystal structures by X-ray diffraction technique, from their molecular graph of it is shown that double bond at 2-carbon atom of the heterocycle is all extro-cyclic at the crystal state, and there are two main plaines in Ⅰa and Ⅰb . But in Ⅰa , the angle between the planes is 61.4° and in Ⅰb the angle is about 41.4°. And so there is a strong conjugative effect in Ⅰb than in Ⅰa. So it is thought that the difference in fungicidal activies between 2-substitutedphenyl compounds(Ⅰa) and 4-substitutedphenyl compounds(Ⅰb) is due to their space factors.
A series of 2-phenyliminothiazolidines has been synthesized; and 2- (2-methylphenyl) iminothiazolidine (Ia) and 2- (4- from their molecular graph of it is shown that double bond at 2-carbon atom of the heterocycle is all extro-cyclic at the crystal state, and there are two main plains in Ia and Ib. But in Ia, the angle between the planes is 61.4 ° and in Ib the angle is about 41.4 °. And so there is a strong conjugative effect in Ib than in Ⅰ a. So it is thought that the difference in fungicidal activies between 2-substitutedphenyl compounds (Ⅰa) and 4-substitutedphenyl compounds Ib) is due to their space factors.