Halogen derivatives of 5-(1′ketoacenaphthylidene)thiazolidine
Acenaphthenequinone and its derivatives readily condense with 3-phenyl-, 3-p-tolyl-, 3-(4-methoxyphenyl)-, 3-(2-methoxyphenyl)-, 3-(4-ethoxyphenyl)rhodanines. The UV absorption spectra of these compounds in dioxane lie in the range 363–390 mμ. Replacement of oxygen by sulfur at position 2 in the thiazolidine ring gives rise to a 14 to 41 mμ bathochromic shift.