The reaction between p-propiolactone and trimethylsilyldialkylamines was performed by adding p-propiolactone (10 mmoles) to trimethylsilyldialkylamine-(12 mmoles) dissolved in ethylene dichloride (2 ml), allowing the mixture to stand for 24 hr at 80, and distilling the product under reduced pressure. The reaction products show a strong infrared absorption at 1720 cm-l which could be assigned as the
