Symmetrical intermediates in the synthesis of carbene–metal complexes from 1,2,3-thiadiazoles and selenadiazoles
Abstract
Treatment of 1,2,3-thiadiazoles and selenadiazoles (1) with di-iron nonacarbonyl gives thioxo- and selenoxo-carbene complexes [e.g.(4)]; formation of cross-over products, (6) and (7), from 4,5-disubstituted diazoles implicates thiiren and seleniren derivatives as symmetrical intermediates.