Page 1. 466 JCS CHEM. COMM., 1980 Synthesis of Macrocyclic and Medium-ring Dithia Compounds using Caesium Thiolates By JAN BUTER and RICHARD M. KELLOGG* (Department of Chemistry, University of Groningen, Nijenborgh 16, 9747 A G Groningen, The Netherlands) ... 2 J. G. de Vries and RM Kellogg, J . Am. Chem. SOG., 1979, 101, 2759. 4 WH Kruizinga and R. M. Kellogg, J . Chem. SOC., Chem. Commun., 1979, 286. ...