Iron and cobalt Complexes [Fe (RS02N) &O. H20], and [CO (RSO~ N)~ CO.~/~ H~ O], which are deficient of terminal and bridging metal carbonyls have been isolate,.; om the reaction of methane-, benzene-, and p-toluenesulfonyl azide with iron pentacarbonyl, diiron nonacarbonyl, and dicobalt octacarbonyl. Hydrolysis of these with dilute hydrochloric acid leads to the corresponding N, N'-bis (sulfony1) urea. Possible structures for the complexes ...