This acetal derivative, also known as 2,2-dimethoxy-N,N-dimethyl-ethanamine, presents as a colorless to pale-yellow liquid. For best results, store in a tightly closed container in a dry and well-ventilated place. (Dimethylamino)acetaldehyde Dimethyl Acetal is incompatible with strong oxidizing agents as well as strong acids. This chemical is flammable in liquid and vapor forms. It also causes skin irritation, serious eye irritation, and may cause respiratory irritation.