Triethylamine → 3-Ethyl-5-{2-ethyl-3-[(3-ethylbenzothiazolin-2-ylidene) ethylidene]isoindol-1(3H)-ylidene}-rhodanine

Participants

Reaction Steps

2-[2-(2-Ethyl-3-methoxyisoindol-1-yl)vinyl]-3-ethylbenzothiazolium perchlorate (0.5 g) and 3-ethylrhodanine (0.3 g) were dissolved in a 1:1 acetronitrile/methanol solution. Triethylamine was added and the reaction mixture heated to reflux for 10 minutes. The dyes which separated out was dissolved in chloroform and passed through a column of silica gel. After recrystallization from a mixture of chloroform and methanol the dye melted at 252°-253° C. pyridine/methanol λ max 661 nm.

Provenance & Evidence