HALOACETALDEHYDE=ALKYL=2-CYCLOPENTENYL=ACETAL COMPOUND AND PRODUCTION METHOD OF THE SAME, AND PRODUCTION METHOD OF (2-CYCLOPENTENYL)ACETATE COMPOUND AND (2-CYCLOPENTENYL)ACETIC ACID COMPOUND FROM THE HALOACETALDEHYDE=ALKYL=2-CYCLOPENTENYL=ACETAL COMPOUND

To provide a novel starting material compound for preparing a (2-cyclopentenyl)acetate compound and a (2-cyclopentenyl)acetic acid compound, and a method for synthesizing the same.SOLUTION: The present invention provides a production method including at least the step of subjecting a compound (1) of the following general formula (1) (where R is a C1-4 linear or branched alkyl group, X1-X7 independently represent a hydrogen atom or a methyl group, one to three of X1-X7 are methyl groups and the remainder are hydrogen atoms, and Y is a halogen atom) to a dehydrohalogenation reaction in the presence of a base, followed by a rearrangement reaction to form a (2-cyclopentenyl)acetate compound of the following general formula (2). The present invention also provides a (2-cyclopentenyl)acetic acid compound of the following general formula (3) by the hydrolytic reaction of the (2-cyclopentenyl)acetate compound (2).SELECTED DRAWING: None 【課題】（２－シクロペンテニル）酢酸エステル化合物及び（２－シクロペンテニル）酢酸化合物を合成するための新規な出発原料化合物および前記合成するための方法の提供。【解決手段】下記一般式（１）：（式中、Ｒは炭素数１～４の直鎖状又は分岐鎖状のアルキル基を表し、Ｘ１～Ｘ７は、それぞれ独立して水素原子又はメチル基を表し、Ｘ１～Ｘ７のうち、１～３つはメチル基を表し、残りは水素原子を表し、Ｙはハロゲン原子を表す。）で表される化合物（１）を塩基の存在下で脱ハロゲン化水素反応させ、続いて転位反応に付して、下記一般式（２）で表される（２－シクロペンテニル）酢酸エステル化合物を得る工程を少なくとも含む製造方法、並びに該（２－シクロペンテニル）酢酸エステル化合物（２）の加水分解反応により、下記一般式（３）で表される（２－シクロペンテニル）酢酸化合物を提供する。JPEG2022188573000051.jpg38170【選択図】なし