Synthesis and reactions of (1,1 '-Bi-1H-phosphirene)iron complexes - Crystal structure of a bridged (1-phosphaallyl-1H-phosphirene)diiron(Fe-Fe) complex

The reactions of 1-chloro-1H-phosphirenes 5 with disodium tetracarbonlyferr ate lead to the selective formation of the mono complexed bi-1H-phosphirene s 7, which are converted into the doubly complexed species 9 upon treatment with di-iron nonacarbonyl, Photochemical opening of one of the two three-m embered ring systems in 9 furnishes the bridged complexes 10 containing pho sphirene and phosphaallyl units together with an iron-iron sigma -bond.