... ARYLPROPIOLATES BY DIRECT HECK COUPLING OF ARYL IODIDE AND METHYL PROPIOLATE IN PRESENCE OF KZCO3 Thomas Eckert and Junes Ipaktschi* Institute of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, ... aryl-H), 7 90 (1 H, dd J 1 0 and 8.1, aryl-H), 7.98 (1 H, dd J 1.3 and 7.3, aryl-H) Page 8. 334 ECKERT AND IPAKTSCHI and 8.30 (1 H, dd J 1.0 and 7.4. aryl-H); &(lo0 MHz; CDC13) 52.67 (OCH3), ...