83261-05-6

Upstream product

• 687-47-8 (S)-Ethyl lactate 
• 98-09-9 benzenesulfonyl chloride 
• 934-55-4 potassium benzenesulfonate 

Downstream Products

• 83261-07-8 L-2-(Benzolsulfonyloxy)propionsaeure 
• 66441-23-4 fenoxaprop-p-ethyl 
• 83261-10-3 O--aceton-oxim 

Relevant academic research and scientific papers

Recovery of PhSO3K from Industrial Waste Based on Solid-Liquid Equilibrium of the PhSO3K-K2CO3-H2O System

The primary aim of this study is to develop a recovery process for PhSO3K from the industrial waste of Qpe (quizalofop-p-ethyl) production. The solubility data for the PhSO3K-K2CO3-H2O system at 15, 25, 35, 45, and 55 °C were determined to obtain the phase diagram of the system. Moreover, the different crystallization fields in the phase diagram of 25 °C were analyzed. The separation technology of PhSO3K from the PhSO3K-K2CO3-H2O system was designed based on the phase diagram. Furthermore, the PhSO3K and K2CO3 in a wastewater from Qpe production were crystallized in sequence by evaporation according to the designed method. The organic impurities precipitated concomitantly with PhSO3K were washed out by ethanol. Finally, the purified PhSO3K was converted to (R)-ethyl O-bezenesulfonyl lactate, the intermediate of Qpe production.

Friedel-Crafts alkylation of aromatic compounds with optically active 2-(mesyloxy)propionates. Synthesis of the optically active anti-inflammatory agent (S)-2-(4-isobutylphenyl)propionic acid

Alkylation of benzene, toluene and isobutylbenzene with (S)-2-mesyloxypropanoate substrates 2a-g in the presence of aluminium chloride, affords the corresponding (S)-methyl-2-phenylpropionates in good chemical yields under ultrasound mediated conditions.This method leads to the synthesis of (S)-brufen in 50percent yield within 2 hours at 40 deg C compared with only 17percent under conventional conditions when isobutylbenzene was treated with 2b, thus leading to a significant improvement in selectivity for (S)-ibuprofen (40percent to 59percent).

Results of Process Research. I. Synthesis of O-propionyl>-acetone oxime

Efficient and simple procedures for the preparation of O--propionyl>-oxime derivatives 7b-e have been developed.The alkylation of 4-phenol (11) with 7d, the final step of a technical synthesis of 1, has been studied in detail.