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Table 1 Yields of benzopyran (4a) under diverse conventional heating and MWI conditions

From: A facile and one-pot synthesis of new tetrahydrobenzo[b]pyrans in water under microwave irradiation

EntrySolventConditionConventionalMWI
Time (h)Yielda (%)Time (h)Yielda (%)
1R.T12.06.0
2Heat10.06.0
3n-HexaneR.T10.04.0
4TolueneR.T10.04.0
5THFR.T5.052.513
6CH3CNR.T5.563.010
7DMFR.T6.092.515
8MeOHR.T3.5672.571
9EtOHR.T2.5710.584
10H2OR.T3.0790.2098
  1. All products were characterized by 1HNMR, 13C NMR, 15N NMR and HR-MS spectral data
  2. aIsolated yields; –: no reaction