Table 1.
The efficiencies of various HPAs catalysts used in the synthesis of THF.
| entry | catalyst | chemical composition of catalyst | yield (%) |
|---|---|---|---|
| 1 | 2a | H3PW12O40 | 98 |
| 2 | 2b | H3PMo12O40 | 87 |
| 3 | 2c | H4SiW12O40 | 91 |
| 4 | 2d | H4SiMo12O40 | 82 |
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