... Download full text in PDF. Tetrahedron, 1965, VoL 21, pp. 3289to 3296. Pergamon Press Lid. ... RH Martin. Tetrahedron 20, 897 (1964). ... ether. The combined extracts were dried (NaiSO, the volume reduced (to 25 ml) and placed on alumina (200 g). Elution with pet. ...