7-Selenabicyclo[2.2.1]heptane

Thermolysis of a benzene solution of N-[4-(p-(methoxybenzyl)seleno)cyclohexanoyl]-N,S-dimethyldithiocarbonate affords the hitherto unknown 7-selenabicyclo[2.2.1]heptane in 48% conversion and in 20% yield after chromatography. G3(MP2)-RAD calculations predict a rate constant of 5 x 10(4) s(-1) at 80 degrees C (3.8 x 10(6) s(-1) at 200 degrees C) for the intramolecular homolytic substitution process involved in this cyclization.