Manuf: Chem. Eng. 61, no. 6, 372 (1954); Huber et al., J. Am. Oil Chem. Soc. 33, 57 (1956); GB 761095; Seaton, US 2782230 (1956, 1957 both to Monsanto); GB 773423; Gerhart, Karwacki, US 2820056 (1957, 1958 both to Continental Oil). Toxicity study: Hopper et al., J. Am. Pharm. Assoc. Sci. Ed. 38, 428 (1949).