HALOACETALDEHYDE ALKYL 2-CYCLOPENTENYL ACETAL COMPOUND AND A PROCESS FOR PREPARING THE SAME, A PROCESS FOR PREPARING A (2-CYCLOPENTENYL)ACETATE ESTER COMPOUND THEREFROM, AND A PROCESS FOR PREPARING A (2-CYCLOPENTENYL)ACETIC ACID COMPOUND THEREFROM
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP4101834A2
公开(公告)日:2022-12-14
The present invention relates to a process for preparing a process for preparing a (2-cyclopentenyl)acetate ester compound of the following general formula (2): wherein R represents a linear or branched alkyl group having 1 to 4 carbon atoms, Y represents a halogen atom, and X1 to X7 represent, independently of each other, a hydrogen atom or a methyl group, with the proviso that one to three among X1 to X7 represent a methyl group and the remaining represent a hydrogen atom, the process comprising: subjecting a haloacetaldehyde alkyl 2-cyclopentenyl acetal compound of the following general formula (1): wherein R is as defined above, X1 to X7 are as selected in the general formula (2), respectively, and Y represents a halogen atom, to a dehydrohalogenation reaction in the presence of a base, followed by a rearrangement reaction to form the (2-cyclopentenyl)acetate ester compound (2) and a process for preparing a (2-cyclopentenyl)acetic acid compound of the following general formula (3): wherein X1 to X7 are as selected in the general formula (1), respectively, the process comprising hydrolyzing the (2-cyclopentenyl)acetate ester compound (2) to form the (2-cyclopentenyl)acetic acid compound (3). The present invention relates also to the novel compound, haloacetaldehyde alkyl 2-cyclopentenyl acetal compound (1).
本发明涉及一种制备下通式(2)的(2-环戊烯基)乙酸酯化合物的工艺:其中R代表具有1至4个碳原子的直链或支链烷基,Y代表卤素原子,X1至X7彼此独立地代表氢原子或甲基,但条件是X1至X7中的1至3个代表甲基,其余代表氢原子,该工艺包括:将下通式(1)的卤代乙醛烷基2-环戊烯基乙缩醛化合物:其中 R 如上定义,X1 至 X7 分别如通式(2)中所选,Y 代表卤素原子,在碱存在下进行脱氢卤化反应,然后进行重排反应,生成(2-环戊烯基)乙酸酯化合物(2),以及制备下式通式(3)的(2-环戊烯基)乙酸化合物的工艺:其中X1至X7分别如通式(1)中所选,该工艺包括水解(2-环戊烯基)乙酸酯化合物(2)以形成(2-环戊烯基)乙酸化合物(3)。本发明还涉及新型化合物卤代乙醛烷基 2-环戊烯基乙醛化合物(1)。