Molybdenum aminocarbyne complex

DIISOCYANIDE COMPLEXES OF MOLYBDENUM(O) AND TUNGSTEN(O) AND DERIVED AMINOCARBYNE COMPLEXES... 

Electrophilic addition to anionic molybdenum isocyanide derivatives [Na][Tp Mo(CNR)(CO)2] is dominated by direct attack at nitrogen to form alkylidyne products however, alkylation at the metal followed by isonitrile insertion can lead to j -iminoacyl complexes in some cases. The aminocarbyne products Tp Mo(=CNRMe)(CO)2 are formed in high yield for methyl and phenyl isocyanide reagents. However, the formation of the corresponding tcrt-butylamino-alkylidyne complex is accompanied by formation of f/ -acyl and / -iminoacyl complexes (Scheme 22). ... 

While all of the transformations detailed above take place at low-valent metal centers, a double sulfur-carbon bond cleavage process has also been postulated to occur at the molybdenum(VI) center (527, 528, 839). Thus, thermolysis of organic isocyanates with [Mo02(S2CNR2)2] affords imido-disulfide complexes, [Mo(NR )(S2)(S2CNR2)2] (Fig. 289), in moderate yields. The fate of the aminocarbyne fragment remains unknown and further, since monosulfido... 

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