Ligand Substitution from the (η<sup>5</sup>-DMP)Mn(CO)<sub>2</sub>(Solv) [DMP = 2,5-dimethylpyrrole, Solv = solvent] Complexes: To Ring Slip or Not to Ring Slip?
作者:Bert H. G. Swennenhuis、Ross Poland、Wai Yip Fan、Donald J. Darensbourg、Ashfaq A. Bengali
DOI:10.1021/ic101123y
日期:2010.8.16
The mechanism and energetics of the displacement of solvent from photolytically generated (eta(5)-DMP)Mn(CO)(2)(Solv) complexes has been studied [DMP = 2,5-dimethylpyrrole, Solv = solvent]. Rate enhancement relative to the eta(5)-cyclopentadienyl (Cp) system is not observed in the displacement of weakly bound solvents. The bond dissociation enthalpies obtained from the kinetic analysis are in good agreement with the values obtained by detailed density functional theory (DFT) calculations. The results indicate that for both the Cp and the DMP based systems the displacement of weakly bound solvents proceeds by a dissociative or I-d mechanism. This is in sharp contrast to CO displacement from (eta(5)-DMP)Mn(CO)(3), which is known to proceed by an associative mechanism by way of an eta(3) ring slip intermediate. The associative substitution pathway only becomes competitive with the dissociative channel when the Mn-Solv bond dissociation enthalpy is more than 33 kcal/mol.
Kershner, David L.; Rheingold, Arnold L.; Basolo, Fred, Organometallics, 1987, vol. 6, # 1, p. 196 - 198
作者:Kershner, David L.、Rheingold, Arnold L.、Basolo, Fred
DOI:——
日期:——
Song, Lexin; Meng, Qinjing; You, Xiaozeng, Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, 1995, vol. 25, p. 671 - 678
作者:Song, Lexin、Meng, Qinjing、You, Xiaozeng
DOI:——
日期:——
Syntheses of .eta.5-heterocyclic manganese tricarbonyls. Effect of the heteroatom and heterocycle ring substituents on carbon monoxide substitution reactions
作者:David L. Kershner、Fred Basolo
DOI:10.1021/ja00258a024
日期:1987.11
The synthesis and characterizations of some new eta/sup 5/-heterocyclic manganese tricarbonyl complexes are described. Kinetic studies are reported for CO substitution reactions of these nitrogen family eta/sup 5/-dimethylheterocyclic manganese tricarbonyl complexes. The results show that only the N-heterocycle compounds undergo CO substitution by phosphorus nucleophiles. These results are attributed
描述了一些新的 eta/sup 5/-杂环锰三羰基配合物的合成和表征。对这些氮族 eta/sup 5/-二甲基杂环锰三羰基配合物的 CO 取代反应进行了动力学研究。结果表明,只有 N-杂环化合物才能被磷亲核试剂取代。这些结果归因于 N 的电负性大于 C、P 或 As 的电负性。三羰基(eta/sup 5/-3,4-二甲基吡咯基)锰(I)和三羰基(eta/sup 5/-2,5-二甲基吡咯基)锰(I)均通过缔合途径取代CO,其中反应速率为金属配合物浓度的一阶和进入亲核试剂浓度的一阶。前一种化合物还通过与进入的亲核试剂浓度无关的途径替代 CO。二阶途径被认为涉及环滑移(eta/sup 5/ ..--> .. eta/sup 3/ ..--> .. eta/sup 5/)机制,而一阶途径途径似乎涉及配体解离机制。