Hi
I intend to synthesis this material.
first sodium methylate and ethanol stirred for 1 hour in temperature. Then I added guanidine hydrochloride and ethyl cyanoacetate were heated to reflux for 4 hours. after that, solvent removed ,added water, pH=11.but when I added acide and pH=7 ,sometimes I didn't get any precipitation, sometime I got precipitation which it was not product. Do you know where is my problem?