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Sustainable Chemical Processes
Fig. 5 | Sustainable Chemical Processes

Fig. 5

From: Butadiene sulfone as ‘volatile’, recyclable dipolar, aprotic solvent for conducting substitution and cycloaddition reactions

Fig. 5

Process diagram for the synthesis of tetrazoles using butadiene sulfone. The reactants are introduced to a reactor in which the synthesis is performed. Post reaction, the retrocheletropic decomposition of Butadiene sulfone leaves the desired product (and side products) behind. These can then further purified using techniques described in Fig. 3. The volatile SO2 and butadiene are trapped in the presence of excess SO2. The neat reformation (cheletropic) reaction is performed at room temperature; after which SO2 is vented. Any residual SO2 can be separated by bubbling N2 through the sulfolene. Since SO2 has a very low vapour pressure compared to N2, it can be easily condensed and recycled

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