Preparation of 1,2-diiodoethene
Alternative Names: trans 1,2-diiodoethene; (E)-1,2-Diiodoethene; (E)-1,2-Diiodoethylene; 1,2-DIIODOETHYLENE; (E)-CHI=CHI; (E)-1,2-Diiodoethene;
1,2-Diodoethylene can be obtained by leading acetylene (purified from gaseous phosphorus, arsenic and sulfur compounds by the method described J. Am. Chem. Soc. 61 (1939) 1868) into a 0,2N-solution of iodine in aqueous potassium iodide. The mixture is kept under a slight over-pressure of acetylene for 2 days, at the end of which 96% of the iodine has reacted and 91 % of crystalline trans-diiodoethylene. The crude crystals of 1,2-diiodoethene were filtered off, washed with potassium iodide solution, sodium hydroxyde solution and water, and dried between filter-papers. The mass was then recrystallized from alcohol, yielding pure 1,2-diiodoethene, m.p. 73.4°C; b.p. 196—197°C.
Acta Chem. Scand., 2, 292 (1948).
1,2-DIIODOETHENE (CIS), CID5378102