Abstract 3, 3′-Diethyl-Δ5, 5′-birhodanine (III, R [DOUBLE BOND] C 2 H 5) was obtained as a by-product from the reactions of 3-ethylrhodanine with 2, 4-dinitrobenzaldehyde and 1- chloro-2, 4-dinitrobenzene under suitable conditions. The synthesis of 5-arylidene substituted rhodanines was achieved from condensations of rhodanines with anils of aromatic aldehydes in glacial acetic acid. III (R [DOUBLE BOND] C 2 H 5, CH 2· CH [ ...