98-59-9Relevant articles and documents
Facile synthesis of sulfonyl chlorides
Huang, Jianxing,Widlanski, Theodore S.
, p. 2657 - 2660 (1992)
A method for the synthesis of sulfonyl chlorides and bromides from the corresponding sulfonate salts is described. The method gives good yields of the acid halides under very mild conditions, and is compatible with both acid and base sensitive functionalities.
Method for continuously synthesizing paratoluensulfonyl chloride by using microchannel reactor
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Paragraph 0058-0100, (2021/08/21)
The invention discloses a method for continuously synthesizing paratoluensulfonyl chloride by using a micro-channel reactor. The method comprises the following steps: by using alkyl halide as a solvent, toluene as a raw material, chlorosulfonic acid as a chlorosulfonating agent and a material obtained by mixing toluene, chlorosulfonic acid, alkyl halide and a catalyst as a reaction starting material, feeding the reaction starting material into a microchannel reactor, carrying out chlorosulfonation reaction, and performing post-treatment on a reaction product flowing out of the microchannel reactor to obtain paratoluensulfonyl chloride. According to the invention, continuous production of p-toluenesulfonyl chloride can be realized, the production efficiency can be greatly improved, and the output of waste acid can be greatly reduced.
Modulating optical and electrochemical properties of perylene dyes by twisting aromatic π-system structures
Wang, Ying,Zhang, Qi,Gong, Junbo,Zhang, Xin
, (2021/03/04)
Three highly fluorescent perylene bisimide dyes were synthesized, where aromatic π-system structures are twisted to different degree by steric hindrance of two or four substitution groups at bay position. Light-emitting colours of these dye solutions can be modulated from green, yellow to red, and their fluorescence quantum yields increase up to approximate 100% with increasing the π-system twisting, which can be considered for new class of wavelength-tunable dye lasers. π-Twisted dyes are more sensitive to microenvironment changes. Thus, they are better fluorescence probe and sensory materials than planar dyes. Electrochemical cyclic voltammetry measurements revealed that these dyes are suitable for n-type optoelectrical devices and materials. These dye solids display near infra-red emission at 600–850 nm. Owing to strong π-π stacking interaction, planar dye solid loses its outstanding optical properties compared to its solution. In contrast, π-twisted dye solids retain their excellent optical properties including narrow emission bands and relatively high fluorescence quantum yields due to the suppression of π-π stacking interaction. Exceptional fluorescence polarization phenomena were observed for these π-twisted dye solids. These optical results revealed that π-twisted perylene bisimide dyes are more excellent optical materials than planar dyes.
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 (2021/03/01)
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.