I found the field of Chemistry very interesting. Saw the article Continuous Flow Preparation of Enantiomerically Pure BINOL(s) by Acylative Kinetic Resolution published in 2020. SDS of cas: 93-97-0, Reprint Addresses Pericas, MA (corresponding author), Barcelona Inst Sci & Technol, Inst Chem Res Catalonia ICIQ, Av Paisos Catalans 16, Tarragona 43007, Spain.; Pericas, MA (corresponding author), Univ Barcelona, Dept Quim Inorgan & Organ, E-08028 Barcelona, Spain.. The CAS is 93-97-0. Through research, I have a further understanding and discovery of Benzoic anhydride
A polystyrene-immobilized isothiourea has been applied to the enantioselective acylative kinetic resolution (KR) of monoacylated BINOL(s) with inexpensive isobutyric anhydride in batch and flow. High selectivity values (s=29 at 0 degrees C) and a remarkable stability of the catalytic system in the operation conditions have been recorded for unsubstituted BINOL. No significant loss of activity/selectivity is recorded after 10 consecutive KR cycles in batch. A continuous flow process has been implemented and operated with a 100 mmol (32.8 g) sample of racemic monoacetylated BINOL in dichloromethane solution in an 84 hours experiment with a packed bed reactor containing 1 g (f=0.37 mmol.g(-1)) of the functional resin (s=17-21). Residence time can be decreased to 10 min with the same reactor to achieve a conversion of 58% with a selectivity factor s=17 when a more highly functionalized catalyst (f=0.88 mmol.g(-1)) is used. This translates into a remarkable combined productivity of 5.5 mmol(prod) . mmol(cat)(-1) . h(-1).
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Reference:
Isothiazole – Wikipedia,
,Isothiazole – ScienceDirect.com