Prepd from allylamine and allyl bromide: Ladenburg, Ber. 14, 1879 (1881); from allylamine and allyl chloride: Liebermann, Hagen, Ber. 16, 1641 (1883); from diallylcyanamide by refluxing with dil H2SO4: Vliet, J. Am. Chem. Soc. 46, 1307 (1924); Org. Synth. coll. vol. I (2nd ed.,1941) p 201. Toxicity study: H. F. Smyth et al., Am. Ind. Hyg. Assoc. J. 23, 95 (1962).