Abstract Authentic pyrrolidine-2, 3-dione has been prepared by two different routes. It is shown that the material previously reported is actually a hydrolysis product, 4-amino-2- oxobutyric acid. 1-Allyl-and 1-ethoxypyrroli-dine-2, 3-dione have been prepared as N- protected pyrrolidine-2, 3-diones potentially useful in synthesis.
