4, R (F)= 4.17%, R (wF)= 5.26% for 5172 reflections (3a (F0)). The cluster consists of a CoRuz triangle with a triply bridging imido ligand and with the hydride bridging the two Ru atoms. Halides have also been found to promote the carbonylation of imido ligands to form isocyanates as illustrated by the rapid reactions which occur to form PhN= C= O when the cluster anions [RU~(~~-NP~)(X)(CO)~]-(X= C1, Br, I) are placed under 1 atm of CO at 22 ...