Synthesis of some 3‐alkenyl‐4‐oxo‐1‐phenyl‐5,6‐dihydro‐1 H ,4 H , ‐pyrano[2,3‐ C ]pyrazole derivatives

The title compounds were prepared from 3‐alkenyl‐1‐phenyl‐2‐pyrazolin‐5‐one derivatives and α,β‐unsaturated acyl chlorides as potential cardiotonic agents.