Declercq, Jean-Paul
[UCL]
Delangle, P
Dutasta, JP.
Vanoostenryck, L.
Simon, Pascal
[UCL]
Tinant, Bernard
[UCL]
The synthesis and characterization of four phosphorus macrocycles (1-4) are reported. The X-ray crystal structures of compounds 1-4 and solvate 1 . H2O show the molecules in asymmetric conformations with at least one methyl group of the phenoxy substituents oriented toward the centre of the macrocyclic cavity. Variable-temperature H-1 NMR experiments show that in solution the molecules exist mainly as rapidly interconverting conformers. In the 18-membered ring 1, the dynamic process results in the enantiomerization of asymmetric conformers with a barrier of 8 kcal mol(-1).double dagger The 21-membered ring 3 is more flexible and exists in several conformations.
Bibliographic reference |
Declercq, Jean-Paul ; Delangle, P ; Dutasta, JP. ; Vanoostenryck, L. ; Simon, Pascal ; et. al. Synthesis and molecular structure of new phosphorous-crown compounds containing the thiophosphoryl group. In: Royal Society of Chemistry. Journal: Perkin Transactions 2, , no. 11, p. 2471-2478 (1996) |
Permanent URL |
http://hdl.handle.net/2078.1/46820 |