The plane of the allyl ligand is typically tilted away from perpendicular to maximize orbital overlap. Allyl ligands can be fluxional on the NMR time scale, but we won't discuss an example here. Most syntheses of trihapto allyl complexes involve the synthesis of a monohapto complex which then displaces a ligand to give the trihapto form. In the example below, note that if we then put the hydrogen on the other terminal carbon, we have accomplished an overall 1,3-hydrogen shift. Reactions of Allyl Complexes All of Chapter 19 of Collman, Hegedus, Norton and Finke is dedicated to reactions of trihapto allyl complexes.
Allyl complexes have a rich and useful chemistry, particularly in organic synthesis.
This is stereoselective if the metal is not attacked first. Attack occurs on the face opposite the metal and usually at the terminal carbon. This document and associated figures are copyright 1996-2001 by Rob Toreki . Send comments, kudos and suggestions to us by email . All rights reserved.