Skip to main content

Table 1 Temperature and catalyst amount for the synthesis of 1,8-dioxo-octahydroxanthene

From: Sulfonic acid-functionalized polyallylamine (sevelamer) as an efficient reusable strong solid acid catalyst for the synthesis of xanthenes derivatives

EntryT (°C)Amount of catalyst (g)Time (min)Yield (%)a
1250.010012073
2500.010012082
3700.01009091
4900.01003094
59012 h31
6900.00108 h84
7900.00506090
8900.01003094
9900.01503095
  1. Reaction conditions: 1a (1.0 mmol), 2a (2.0 mmol), S-SO3H (10 mg), water (1.0 mL), 90 °C
  2. aIsolated yield