Schoepf et al. Chemische Berichte, 1956 , vol. 89, p. 1821,1823, 1831 Full Text Show Details Schoepf; in K. Ziegler Praeparative Organische Chemie Tl. II (= Naturf. Med. Dtdschld. 1939-1946, Bd. 37) S. 117, 121