Synthesis of Chiral O-Functionalized Isobornyloxy, Menthyloxy and Fenchyloxy Cyclopentadienyl Ligands
作者:Adolphus A. H. van der Zeijden、Chris Mattheis
DOI:10.1055/s-1996-4300
日期:1996.7
Natural (+)-camphene was used as the starting material for the preparation of an isobornyloxy-substituted cyclopentadienyl ligand in a simple two-step procedure. (-)-Menthol and (+)-fenchol were converted to analogous chiral cyclopentadienyl ligands in a four-step procedure. The new ligands contain an ether linkage suitable for bidentate chelation to a transition metal.
precursors camphorsulfonic acid and camphene, several imidazoliumionicliquids were synthesized in high overall yield. Both thermal and microwave-assisted- synthesis was used in the quaternization step to obtain new chiral ionicliquids (CILs) bearing a bornyl structural motif as cation. Furthermore, these CILs were used as solvent in the Diels-Alder- reaction of acrylic acid and cyclopentadiene and showed