“…Only a few of the many methods of preparation are listed: (4) Se02 + RH + AIXs -» RgSeX (88) (5) SeOCl2 + RH -> R2SeCl2 (1, 5, 127, 140) (6) RSeCN + Br2 -> RSeBr3 (6,14,16) The reactions of SeOCl2, Se2Cl2, and SeCl4 with olefins (17), phenols (127,140), phenol esters (1), and alkyl-aryl ketones (139) all yield selenonium compounds.…”