There is disclosed a process for the racemization of a vinyl-substituted cyclopropanecarboxylic acid or a derivative thereof, which is characterized by reacting an optically active vinyl-substituted cyclopropanecarboxylic acid compound of formula (1):
1
wherein R
1
, R
2
, R
3
and R
4
each independently represent
a hydrogen atom, a halogen atom,
alkyl which may be substituted having 1-4 carbon atoms,
aryl which may be substituted, or
alkoxycarbonyl which may be substituted, or
R
1
and R
2
are bonded to form an alkylene group, which may be substituted; and wherein X represents hydroxyl, a halogen atom, alkoxy which may be substituted having 1-20 carbon atoms, or aryloxy which may be substituted,
with a nitric compound or a nitrogen oxide.
揭示了一种用于光学异构体化的
乙烯基取代环丙基
羧酸或其衍
生物的过程,其特征在于将化合物式(1)的光学活性
乙烯基取代环丙基
羧酸化合物与
硝基化合物或氮氧化合物反应,其中式中R1、R2、R3和R4分别独立表示氢原子、卤素原子、可能被取代的具有1-4个碳原子的烷基、可能被取代的芳基、或可能被取代的烷氧羰基;或者R1和R2结合形成可能被取代的烷基基团;X代表羟基、卤素原子、可能被取代的具有1-20个碳原子的烷氧基,或可能被取代的芳氧基。