A process for producing a hydroxyiminoalkenyl cyclopropanecarboxylic acid ester represented by formula (3) (wherein R1 represents an alkyl group which may have a substituent, or a halogen atom and R2 represents an alkyl group which may have a substituent, or a benzyl group which may have a substituent), comprising an oximation step of reacting a formylalkenyl cyclopropanecarboxylic acid ester represented by formula (1) (wherein R1 and R2 are as defined above) with hydroxylamine in a solvent in the presence of at least one compound selected from the group consisting of carboxylic acids and metal salts of carboxylic acids.本發明係揭示一種以式(3)表示之羥基亞胺基烯基環丙烷羧酸酯之製造方法,(式中,R1表示可具有取代基之烷基或鹵素原子,R2表示可具有取代基之烷基或可具有取代基之苄基),該方法具有於溶劑中,在由羧酸及羧酸之金屬鹽所組成群組選出之至少一種化合物存在下,使以式(1)表示之甲醯基烯基環丙烷羧酸酯與羥基胺反應之肟化步驟:(式中,R1及R2係如前述定義)。
