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Table 1 Recycling results of sulfolene solvents

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

Entry Solvent Scale (mL) SO2/diene molar ratio Cold bath (°C) Recovered solvent (%)
1 PS 5 8 −55 89 ± 2
2 PS 20 6 −60 98 ± 0
3 BS 20 6 −76 95 ± 1a
  1. aTwo replicates, one of them is added with inhibitor