Journal
CHEMICAL COMMUNICATIONS
Volume -, Issue 40, Pages 4875-4884Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b807655c
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Funding
- Swiss National Science Foundation
- ETHZ
- COST Action D40
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The atropisomeric chelating auxiliaries MeO-Biphep, Binap, MOP and selected monodentate phosphoramidite type ligands are all capable of using differing aromatic fragments as donors to stabilize coordinatively unsaturated 14- or 16-electron species. MeO-Biphep and Binap make use of a double bond immediately adjacent to one of the P-donors to turn these chelate ligands into six-electron donors. In addition to the P-atom, the MOP class uses the pi-electrons of the naphthyl group, not attached to the phosphorus atom, to form a 4e chelate ligand. The MeO-MOP ligands often form weak sigma-bonds, derived from the electrons in this naphthyl ring, rather than pi-olefin complexes. Phosphoramidites, and some related ligands such as ''simple-phos'', use a pendant phenyl group to form an eta(2)-arene, P-chelate. The various bonding modes have been investigated via X-ray, NMR and DFT studies.
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