Kuwada; Miyasaka Yakugaku Zasshi, 1937 , vol. 57, p. 870,873; dtsch. Ref. S. 232 Chem. Zentralbl., 1938 , vol. 109, # II p. 1610 Show Details Grob; Goldberg Helvetica Chimica Acta, 1949 , vol. 32, p. 184,188