Leung, G. Y. C., Ying, S. T. R., Chia, E., Chen, A., Loh, G., & Ramalingam, B. (2023). Safe and on-demand protocol for the continuous generation of SO2 and Cl2 for subsequent utilization in organic synthesis. Journal of Flow Chemistry. https://doi.org/10.1007/s41981-023-00280-2
Abstract:
Hazardous reagents such as sulfur dioxide (SO2) and chlorine (Cl2) are powerful and atom-efficient reagents for respectively introducing the ‘SO2’ moiety and ‘Cl’ atom into organic molecules. However, their use is limited due to a lack of protocols and methods to access them in laboratories readily. This article describes the development of a prototype, method, and process for accessing hazardous gaseous reagents safely on demand continuously for further utilization in organic synthesis. The prototype was validated by producing SO2 from readily accessible laboratory reagents sodium sulfite (Na2SO3) and sulfuric acid (H2SO4). The generated SO2 was successfully utilized for the synthesis of aryl sulfinate salts, which were subsequently converted to sulfonamides and sulfone-containing bicalutamide drugs. The broader applicability of the reactor prototype has also been demonstrated in the generation of chlorine gas from bleach (NaOCl) and hydrochloric acid (HCl), followed by the separation of chlorine gas from an acidic aqueous reaction mixture. The utilization of the separated chlorine gas was demonstrated in the synthesis of silyl chlorides in both batch and continuous manners. The present reactor prototype not only enables safe and convenient access to highly hazardous gaseous reagents for facile organic synthesis in laboratories, but also eliminates the risks in handling, storage, and transportation of hazardous gaseous reagents in cylinders.
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Publisher Copyright
Funding Info:
Institute of Sustainability for Chemicals, Energy and Environment (ISCE2) and Agency for Science, Technology and Research (A*STAR), Republic of Singapore is greatly acknowledged for funding (project code: ICES/17-1F2A01).
Description:
This version of the article has been accepted for publication, after peer review and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s41981-023-00280-2