Reaction of resorcinol and ethylacetoacetate in the presence of different amount of PVPHS.
| Entry | Amount of catalyst (mg) | Room temperature | Ultrasonic irradiation | ||
|---|---|---|---|---|---|
| Time (h) | Yield (%) | Time (min) | Yield (%) | ||
| 1 | — | 6 Trace | 60 44 | ||
| 2 | 5 | 2 32 | 15 86 | ||
| 3 | 10 | 2 48 | 5 96 | ||
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