Acetic Anhydride → 2-Cyanophenoxathiin

Participants

Reaction Steps

The crude phenoxathiin-2-aldehyde was dissolved in acetic acid (150 ml) and boiled with hydroxylamine hydrochloride (2.76 g) and sodium acetate (3.24 g) for 1.5 hr. Acetic anhydride (150 ml) was added, and the mixture boiled under reflux for 3 hr., cooled and filtered. The filtrate was poured into water and stirred for 1 hour to decompose the acetic anhydride, then extracted with chloroform, washed with water and sodium bicarbonate solution, dried, and evaporated to give crude 2-cyanophenoxathiin as an oil which solidified.

Provenance & Evidence