Synthesis and Structure Identification of 1-[4-(4-pentylcyclohexyl)-phenyl]-3-(quinolin-8-ylamino)prop-2-en-1-one Molecules in Solvents of Different Polarities

β-Enaminone 1-[4-(4-pentylcyclohexyl)-phenyl]-3-(quinolin-8-ylamino)prop-2-en-1-one was first synthesized and studied by NMR and UV spectroscopy. It was established that the molecules of this substance exist in the ketone form of the cis-isomer in both polar acetone and weakly polar chloroform. Exposing the solutions of this enaminone daylight at room temperature leads to the formation of small amounts of trans-isomer in them. 365 nm UV irradiation of the solution in chloroform leads to reversible cis–trans isomerization of the dissolved molecules of 1-[4-(4-pentylcyclohexyl)phenyl]-3-(quinolin-8-ylamino)prop-2-en-1-one.