Summary The spectra of several 1, 3-diketones, Arl-COCH2-CO-Ar2, and of related enol- ethers, Arl-COCH= C (OCH3)-Ar2, and chalcones, Arl-CO-CH= CH-Ar2, have been measured and the wave length, Amax,, of their maximum absorption bands are herein reported. Several observations are made and discussed regarding the Amax, of the enol- ethers and of chalcones containing very different groups Arl and Ar2.
