2,3-Dihydro-4,5-diisopropyl-1,3-dimethylimidazol-2-yliden und seine Chalkogenone.

2,3-Dihydro-4,5-diisopropyl-1,3-dimethylimidazol-2-ylidene (6) is prepared by reduction of the corresponding thion 7a with potassium. The selenium compound 7b is obtained from 6 and selenium. In the solid state, 7a and 7b exist as their isomers, as revealed by their crystal structures. [ABSTRACT FROM AUTHOR]