Nitrosyl cluster compounds, synthesis

These methods have also been applied to the synthesis of nitrosyl cluster compounds (24, 25) ... 

An important recent development in this class of reaction has been the use of bis-(triphenylphosphine)iminium (PPN) nitrite. This reagent has proved to be particularly useful, especially in the synthesis of nitrosyl cluster compounds from the more readily available carbonyl clusters under mild conditions 43, 44) ... 

Although it is not strictly an organometallic cluster, Roussin s Black salt, [Fe4(S)3(NO)7] , represents the first nitrosyl compound prepared via nitrite. The reaction of FeS04, NaN02, and (NH4)2S is perhaps the most convenient method of synthesis of this cluster (29). A better defined approach to the use of N02 was first introduced by Hieber with Fe(CO)s [Eq. (15)] (30). The direct extension of this reaction to Mo(CO)6... 

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