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

• Main Authors: YAMASHITA, Miyoshi, KINSHO, Takeshi
• Format: Patent
• Language: English; French; German
• Published: 22.11.2023
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

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).