A new form of an enantiomer pair of stereoisomers of fenvalerate comprising (S)-a-cyano-3-phenoxybenzyl(S)-2-(4-chlorophenyl)isovalerate and the (R)-(R) enantiomer as a crystal of characteristics:
crystal system: monocliniclattice constants: a = 11.90 A, b = 5.60 A, c = 32.58 A, β = 93.0°space group: P2 1/cdensity: 1.28 g/cm3number of molecules in unit lattice: 4.A process of preparing the enantiomer pair or the fenvalerate rich in the enantiomer pair comprises depositing said crystals from a solution of a racemate of fenvalerate. Another process of preparing the enantiomer pair comprises depositing the crystals from a solution of the fenvalerate rich in the enantiomer pair and separating the crystals from the liquor.
由(S)-a-
氰基-3-苯氧基苄基(S)-2-(4-
氯苯基)
异戊酸酯和(R)-(R)对映体组成的芬
戊酸酯对映体立体异构体的新形式,为特征晶体:
晶系:单斜晶格常数:a = 11.90 A,b = 5.60 A,c = 32.58 A,β = 93.0°空间群:密度:1.28 克/立方厘米单位晶格中的分子数:制备对映体或富含对映体的
氰戊菊酯的工艺包括从
氰戊菊酯外消旋体溶液中沉积上述晶体。制备对映体的另一种工艺包括:从富含对映体的
氰戊菊酯溶液中沉积晶体,并将晶体与液体分离。