Prepd by the action of benzylmagnesium chloride on n-butyl p-toluenesulfonate: Rossander, Marvel, J. Am. Chem. Soc. 50, 1491 (1928); Gilman, Heck, ibid. 50, 2223 (1928); Gilman, Robinson, Org. Synth. coll. vol. II, 47, (1943).