Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The acid-catalyzed isomerization of the title compound (2) to the thermodynamically-favored Z isomer 4 proceeds first to the E-isomer 3. ... All new compounds have been characterized by elemental analysis, 1 Hnmr (250 MHz in CDCl 3 solution), UV-visible and mass ...