Table 2. Recrystallization of Crude Product 6 in Different Solvents.
entry | solvent | solvent (V) | % mass recoverya | wt % purityb |
---|---|---|---|---|
1 | chlorobenzene | 10 | 53 | 98 |
2 | CPME | 10 | 23 | 97 |
3 | anisole | 10 | 30 | 69 |
4 | toluene/chlorobenzene (1:1) | 5 | 61 | 96 |
5 | toluene | 10 | 84 | 82 |
6 | i-PrOAc | 2.5 | 66 | 98 |
7 | CH3CN | 2.5 | 64 | 96 |
Adjusted to purity.
By qNMR.