Exceedingly Facile PhX Activation (X=Cl, Br, I) with Ruthenium(II): Arresting Kinetics, Autocatalysis, and Mechanisms Academic Article uri icon

abstract

  • Abstract[(Ph3P)3Ru(L)(H)2] (where L=H2 (1) in the presence of styrene, Ph3P (3), and N2 (4)) cleave the PhX bond (X=Cl, Br, I) at RT to give [(Ph3P)3RuH(X)] (2) and PhH. A combined experimental and DFT study points to [(Ph3P)3Ru(H)2] as the reactive species generated upon spontaneous loss of L from 3 and 4. The reaction of 3 with excess PhI displays striking kinetics which initially appears zeroth order in Ru. However mechanistic studies reveal that this is due to autocatalysis comprising two factors: 1)complex 2, originating from the initial PhI activation with 3, is roughly as reactive toward PhI as 3 itself; and 2)the PhI bond cleavage with the justproduced 2 gives rise to [(Ph3P)2RuI2], which quickly comproportionates with the stillpresent 3 to recover 2. Both the initial and onward activation reactions involve PPh3 dissociation, PhI coordination to Ru through I, rearrangement to a 2PhI intermediate, and PhI oxidative addition.

published proceedings

  • Angewandte Chemie

author list (cited authors)

  • Miloserdov, F. M., McKay, D., Muoz, B. K., Samouei, H., Macgregor, S. A., & Grushin, V. V.

complete list of authors

  • Miloserdov, Fedor M||McKay, David||Muñoz, Bianca K||Samouei, Hamidreza||Macgregor, Stuart A||Grushin, Vladimir V

publication date

  • July 2015

publisher