The reactions of the molybdenum alkylidyne complex [MesC[triple bond, length as m-dash]Mo{OCMe(CF)}] (1) with the diaminoacetylenes RNC[triple bond, length as m-dash]CNR (2, NR = 4-methylpiperidinyl; 3, NR = NEt; Mes = 2,4,6-trimethylphenyl) afforded the metallacyclobutadiene (MCBD) complexes 4 and 5. In contrast to all other MCBD complexes, 4 and 5 are paramagnetic and best described as Mo(iv) species containing an anionic diaminodicarbene of the type [(RN)CC(Mes)C(NR)].
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| http://dx.doi.org/10.1039/c7dt00305f | DOI Listing |
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