114649-83-1Relevant academic research and scientific papers
Synthesis of Linearly Fused 2,8-Dialkyl-4,6-dioxo-4H,6H-benzodipyrans
Reddy, K. Chandraprakash,Srimannarayana, G.
, p. 766 - 767 (2007/10/02)
2,8-Diethyl/dipropyl-4,6-dioxo-4H,6H-benzodipyran (IVa,b) have been prepared by Claisen condensation of 5-acetyl-2,4-dihydroxyacetophenone (I) with ethyl butyrate and ethyl propionate respectively followed by acid-catalyzed cyclization of the resulting diketone (IIIa,b) with conc HCl.Claisen condensation of 2,4-dihydroxy-5-propionylpropiophenone (V) with ethyl butyrate and ethyl propionate furnishes 2,8-dipropyl-(VIa)- and 2,8-diethyl-(VIb)-3,7-dimethyl-4,6-dioxo-4H,6H-benzodipyrans respectively.
