... A Novel Efficient Approach to the Synthesis of 6-Ox0 Ethinylestradiol and its 3- lsopropanesulfonate 1)2) GISELA WEBER, J. SCHAUMANN, CONSTANZE CARL, S. SCHWARZ* Division of Research, VEB Jenapharm, Jena ... [14] VEB Jcnapharm (Inv. J. SCHAUMANN, C. CARL and S . SCHWARZ) Wirtsch. Pat. ... r22] DEHMLOW, EV ; DEHMLOW, SS: Phase Transfer Cntalgsis; Monographs iri Modern Chemistry, [23] SCKWABZ, s.; WEBER, G.: z. Chem. ...