References
Brown et a!., Austral. 1. Chern., 7, 181 (1954)
Duffield, Jefferies, Lucich., ibid, 15,812 (1962)
Duffield, Jefferies, Lucich., ibid, 16, 123 (1963)
Duffield et al., Tetrahedron, 19,593 (1963)
Govindachari, Prabhakar.,Ind. 1. Chern., 1, 17 (1963)