2-(Tributylstannyl)-4, 4-dimethyl-2-oxazoline (1) reacted with aroyl chloride smoothly without any palladium catalyst to give the unusual product, bis (N-aroyl-4, 4-dimethyl-2- oxazolinylidene) in good yields. The reaction of 1 with other types of halide needed a palladium catalyst, and gave the corresponding 2-substituted-4, 4-dimethyl-2-oxazoline in good yields.