Overall reaction mechanism Br Br HOR ∥Br Products Second order kinetics Br2 Third order Kinetics Br2 Products 3 plex IR, Raman, and Uv studies show the presence of a donor acceptor complex The rate determining step is the disappearance of this donor-acceptor complex. Steps a and b have been considered irreversible in most kinetic analyses The a-complex may be a bromonium ion or bromocarbocations depending on the olefin used Schmid, G. H. The Chemistry of Double Bonded Functional Groups, Wiley, New York 1990, p 699 BA-Bromination 03 10/4/00 5: 23 PMSchmid, G. H. The Chemistry of Double Bonded Functional Groups, Wiley, New York 1990, p.699 . .IR, Raman, and UV studies show the presence of a donor acceptor complex The rate determining step is the disappearance of this donor-acceptor complex. Steps A and B have been considered irreversible in most kinetic analyses. The σ-complex may be a bromonium ion or bromocarbocations depending on the olefin used. . Products Products B Slow A Slow Br + + - Br-.HOR σ-complex σ-complex charge transfer complex (π-complex) Overall Reaction Mechanism Br2 Br Br Br Br Br3– Br3– Br2 Br2 Second Order Kinetics Third Order Kinetics 09A-Bromination 03 10/4/00 5:23 PM