Δ<sup>5,7</sup>-Steroids. XIII. Steroidal Cyclic Ketals. II<sup>1,2</sup> the Preparation of Δ<sup>4,7</sup>-Pregnadiene-3,20-Dione and Δ<sup>4,7</sup>-Pregnadiene-21-Ol-3,20-Dione-Acetate
作者:Rose Antonucci、Seymour Bernstein、Robert Lenhard、Karl J. Sax、James H. Williams