Novel hybrid perovskite crystal NH3(CH2)7NH3BiCl5 as a potential catalytic performance and eco-friendly for the synthesis of 3,4-dihydropyrano [3,2-c] chromenes derivatives

The untold story of starch as a catalyst for organic reactions

“…For instance, prepared tetrahydrobenzo compounds can be used as an effective anti-cancer, anti-coagulant, diuretic, spasmolytic, and anti-anaphylactic agents 63 and dihydropyrano[ c ]chromenes are similarly known for their anti-coagulant, anti-cancer, anti-bacterial, anti-microbial, anti-alzheimer, and anti-malaria properties. 64 Hazeri et al succeeded in achieving a protocol for the synthesis of both tetrahydrobenzo[ b ]pyrans and 3,4-dihydropyrano[ c ]chromenes using starch solution as a catalyst (Scheme 5). 65 They prepared the starch solution as mentioned before 62 and carried out these two three-component reactions at 50 °C with a very good yield for the products.…”