Organic Selenium Compounds. Synthesis of 1,3-selenazin-4-imines by Flash Vaccum Pyrolysis of 2- piperidino-1,3-selenazoles

CEBALLOS NOELIA M.; MOYANO, ELIZABETH L.; YRANZO, GLORIA I.; KOKETSU, MAMORU; ISHIHARA, HIDEHARU

FLORIANOPOLIS-BRASIL

Congreso; 12th BRAZILIAN MEETING ON ORGANIC SYNTHESIS; 2007

The technique of flash vacuum pyrolysis (fvp) has found widespread use in several applications ranging from mechanistic studies to preparative organic chemistry. This methodology involves vacuum sublimation or distillation of a substrate through a tube which is inside a tubular furnace  (350-1000ºC) to induce chemical transformations. After passing through the tube, products are condensed at low temperatures (- 200ºC) in a trap placed at the exit of the reactor. The chemistry of heterocycles containing selenium in their structure has been widely developed in the last years;however the gas-phase thermal behavior of these compounds has been scarcely studied. A few examples of thermolysis of 1,2,3-selenadiazoles giving selenoketenes by nitrogen extrusion reaction have been reported.