Pyrimidine derivatives substituted heterocyclic 4-novel represented by the following formula (1) is useful as a pesticide. (Formula (1), 3, R 4 R represents an n = 0~5, a hydrogen atom, a hydrogen atom, a halogen atom, 1, R 2 R carbon linear or branched, Q A represents a cyclic structure of 5-membered ring represented by the formula (2), an alkyl group of 1 to 6 atoms. (In the formula (2), V, X is. Indicating a hydrogen atom, etc. 6, R 7 R 5, R, and oxygen atom))下記式(1)で表される新規な4-複素環置換ピリミジン誘導体は、有害生物防除剤として有用である。(式(1)において、R1、R2は水素原子、ハロゲン原子等を、R3、R4は水素原子等を、n=0~5を示し、Qは直鎖状又は分岐状の炭素原子数1~6のアルキル基等を、Aは式(2)で表される5員環の環状構造等を示す。(式(2)において、V、Xは酸素原子等を、R5、R6、R7は水素原子等を示す。))
