... Chem., 8 [lo]. 50 (1953). (16) LR Fibel and PE Spoerri, THIS JOURNAL, 70, 3908 (1948). ... Vol. 78 ... The dried intermediate (16.2 g.) was refluxed for 4 hours in 160 ml. of absolute ethanol, the solution concentrated to about half of the original volume and then diluted with water. ...