Chapman,N.B.; Triggle,D.J. Journal of the Chemical Society, 1963 , p. 1385 - 1400 Full Text Show Details Shapiro et al. Journal of the American Chemical Society, 1958 , vol. 80, p. 6060,6063 Journal of the American Chemical Society, 1959 , vol. 81, p. 203,207 Full Text Show Details Beck et al. Journal of Organic Chemistry, 1951 , vol. 16, p. 1434,1437