Entry | Solvent | Yield (%) |
1 | tetrahydrofuran | 13.89 |
2 | toluene | 48.20 |
3 | n-hexane | 58.45 |
4 | n-heptane | 57.19 |
5 | acetonitrile | 44.21 |
6 | solvent-free | 45.80 |