33798-77-5Relevant articles and documents
Investigation on recovery of p-mephso3k based on solid-liquid equilibrium of the p-mephso3k-k2co3-h2o system
Shuanghong, Hao,Jie, Xu,Mengqi, Chen,Yan, Wei
, p. 1249 - 1254 (2021)
In this article, we propose a method of recovering p-MePhSO3K from the industrial by-product of quizalofop-p-ethyl. The phase diagram of the solid-liquid equilibrium system of p-MePhSO3K2CO3-H2O at the temperatures of 15, 25, 35, 45, and 55°C was determined and plotted. Based on the phase diagram of 25°C, the separation and recovery process of p-MePhSO3K from the p-MePhSO3K2CO3-H2O system was designed by analyzing the crystallization fields. First, p-MePhSO3K and K2CO3 were crystallized from wastewater in turn through evaporation separation. Then, the crystallized p-MePhSO3K was purified further by washing with ethanol. Finally, the pure p-MePhSO3K was transformed into the intermediate p-toluenesulfonyl chloride and then the intermediate L-p-toluenesulfonate ethyl lactate for quizalofop-p-ethyl production.
SYNTHESIS OF THE ENANTIOMERS OF CIS-2-METHYL-5-HEXANOLIDE, THE MAJOR COMPONENT OF THE SEX PHEROMONE OF THE CARPENTER BEE
Mori, Kenji,Senda, Shuji
, p. 541 - 546 (2007/10/02)
(2R,5S)-2-Methyl-5-hexanolide and its antipode were synthesized in highly optically pure state (98-99percent e.e.) starting from ethyl (S)-lactate and the enantiomers of methyl β-hydroxyisobutyrate.The specific rotations of our samples were D +/- 91.0 -93.5 deg (CHCl3), while the reported values of the samples prepared by resolution or asymmetric synthesis were +/- 64.5-65.6 deg.
