Prepn from butyl bromide and ammonia with separation of the mono-, di-, and tributylamines formed: Werner, J. Chem. Soc. 115, 1010 (1919). Manuf: Engel, Hoog, US 2574693 (1951 to Shell); Davies et al., US 2609394 (1952 to I.C.I.); Lemon, Myerly, US 3022349 (1962 to Union Carbide); Brois, Rutkowski, US 3147310 (1964 to Esso). Toxicity study: H. F. Smyth et al., Arch. Ind. Hyg. Occup. Med. 10, 61 (1954).