A new process for synthesis of (1E, 6E) - 1, 7-bis (4-hydroxy-3methoxy phenyl)- 1,6- heptadiene-3,5-dione, comprising the steps of :(i)condensation of acetone with vanillin to form compound 4-(4-hydroxy-3-methoxy phenyl) - but -3-ene-2-one (ii)condensation of ethyl acetate with vanillin to form 3-(4-hydroxy-3-methoxy phenyl) - 2-ene ethyl propanoate (iii)condensation of resulting compounds of step (i) and (ii) to form the final product.