Foster et al. Journal of the Chemical Society, 1949 , p. 2542,2545 Full Text Show Details Raymond; Schroeder Journal of the American Chemical Society, 1948 , vol. 70, p. 2785,2790 Full Text Show Details Freudenberg; Raschig Chemische Berichte, 1927 , vol. 60, p. 1633 Chemische Berichte, 1929 , vol. 62, p. 373