| 摘要 |
The title compds.(I; R1 = H, lower alkyl; R2 = lower alkyl, lower alkoxy, optionally substituted aromatic group; X = oxygen or sulfur), useful as a plant growth regulator, were prepd. by the reaction of 2-chloro-4-aminopyridine (II) and phenylisocyanate(III). Thus, 257 mg 2-chloro-4- aminopyridine and 238 mg phenylisocyanate were reacted in acetone at room temp for 8 hr, and recrystallized to give 346 mg N-(2-chloro-4-pyridyl)-N'-phenylurea.
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