| 摘要 |
<p>An ester of the following formula (5a): [in the formula (5a), R1, R2, R3 and R4 are hydrogen atoms and so on, A1, A2, A3 and A4 are hydrogen atoms and so on, R represents a methylene group and so on, and R7 represents an alkyl group having 1 to 10 carbon atoms and so on] 10 is useful for producing a lactam of the following formula (1) which is an intermediate compound of chemical raw materials and medical agricultural drugs.</p> |
