Keneford et al. Journal of the Chemical Society, 1948 , p. 358,359 Journal of the Chemical Society, 1950 , p. 1110,1111 Full Text Show Details Hartung et al. Journal of the American Chemical Society, 1931 , vol. 53, p. 4149,4154 Full Text Show Details Leonard; Boyd Journal of Organic Chemistry, 1946 , vol. 11, p. 405,412 Full Text Show Details Zenitz; Hartung Journal of Organic Chemistry, 1946 , vol. 11, p. 444,447