PROCESSES FOR PREPARING 5,5-DIMETHYL-2-OXO-3-CYCLOPENTENE-1-CARBOXYLATE COMPOUNDS AND 3,5,5-TRIMETHYL-2-OXO-3-CYCLOPENTENE-1-CARBOXYLATE COMPOUNDS FROM 3,3-DIMETHYL-1-BUTENE-1,4-DICARBOXYLATE COMPOUNDS AND 1,3,3-TRIMETHYL-1-BUTENE-1,4-DICARBOXYLATE COMPOUNDS, AND 1,3,3-TRIMETHYL-1-BUTENE-1,4-DICARBOXYLATE COMPOUNDS
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20220024846A1
公开(公告)日:2022-01-27
The present invention provides a process for preparing a compound of the following general formula (2): wherein R
1
represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, and R
3
represents a hydrogen atom or a methyl group, the process comprising: subjecting a compound of the following general formula (1): wherein R
1
and R
2
represent, independently of each other, a monovalent hydrocarbon group having 1 to 10 carbon atoms, R
3
represents a hydrogen atom or a methyl group, and the wavy bond represents an E-configuration, a Z-configuration, or a mixture thereof, to a Dieckmann condensation in the presence of base to form the compound (2).
本发明提供了一种制备以下通式(2)化合物的方法:其中R1表示具有1至10个碳原子的单价烃基,R3表示氢原子或甲基基团,该方法包括:将以下通式(1)的化合物:其中R1和R2分别独立地表示具有1至10个碳原子的单价烃基,R3表示氢原子或甲基基团,波浪形键表示E-构型、Z-构型或其混合物,在碱的存在下进行Dieckmann缩合,形成化合物(2)。