The amidinium (carbene) complexes ReBr(CO)4[C(NHR)(NHPh)]1 react with the secondary amine (Et2NH) to yield the cyclometallated rhenium carbene complexes Re(CO)4[µ2·C(NHR)(NHC6H4)2, which undergoes facile and successive closing and opening of the Re–Co σ6; bond by the elimination and addition of electrophiles in rhenium carbene complexes under very mild conditions to yield the final product Rel(CO)4[C(NHPri)(NHC6H3I2)]5.
K. Lu, C. Wang, H. Lee, L. Chen and Y. Wen, J. Chem. Soc., Chem. Commun., 1993, 706 DOI: 10.1039/C39930000706
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