Category: bromides-buliding-blocksIn 2020 ,《Base-Controlled Directed Synthesis of Metal-Methyleneimidazoline (MIz) and Metal-Mesoionic Carbene (MIC) Compounds》 was published in Organometallics. The article was written by Kaur, Mandeep; Patra, Kamaless; Din Reshi, Noor U.; Bera, Jitendra K.. The article contains the following contents:
C2-Substituted imidazolium salts undergo base-controlled metalation of 2-Me group or formation of C4-metalated (MIC) complexes in reaction with ruthenium chloride-bridged precursor. Reactions of a host of metal precursors with pyridyl(benzamide)-functionalized C2-methyl-protected imidazolium salts [L1H2]I and [L2H]I afforded the metal-methyleneimidazoline (MIz) compounds [Ru(L1-κC1)(p-cymene)]I (1, H2L1-I = PhCONH-2,6-py-2,3-Me2-1H-imidazolium iodide), [Mn(L1-κC1)(CO)3] (2), [Ru(L2-κC1)(p-cymene)Cl]PF6(3, HL2-I = 2,3-dimethyl-1-(2-pyridyl)-1H-imidazolium iodide), and [Ir(L2-κC1)(Cp*)Cl]PF6 (4) in the presence of different external bases, such as LiHMDS, Na2CO3, tBuOK, and NaH. However, the use of NaOAc led to the selective formation of the metal-mesoionic carbene (MIC) compounds [Ru(L2-κC5)(p-cymene)Cl]PF6 (5), [Ir(L2-κC5)(Cp*)Cl]PF6 (6), [Ir2(L1-κC5)(Cp*)2I]PF6 (8), and the ortho-metalated compound [Ir(L1)(Cp*)I] (7). All compounds have been characterized by spectroscopic techniques and X-ray crystallog. Being more acidic, the C2-Me is readily deprotonated by the external base to give the metal-MIz products. A metal-bound acetate, in contrast, interacts selectively with the imidazolium C5-H and drives the reaction toward the metal-MIC formation. DFT calculations support a concerted metalation-deprotonation pathway for selective C-H activation and metalation. In the experiment, the researchers used Bromopentacarbonylmanganese(I)(cas: 14516-54-2Category: bromides-buliding-blocks)
Bromopentacarbonylmanganese(I)(cas: 14516-54-2) has many other uses. It is used in the formation of (eta6-arene)tricarbonylmanganese(I) by reacting with arene (arene= hexamethyl benzene, 1,2,4,5-tetramethyl benzene, mesitylene, p-xylene and toluene) in the presence silver salt.Category: bromides-buliding-blocks
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary