Abstract
The sterically demanding nucleophilic carbene ligand 1,3-bis(2,6-diisopropylphenyl)imidazol-2 (IPr, 4) has been synthesized. The reaction of [Cp*RuCl](4) (5; Cp* = eta*-C5Me5) with this ligand affords a coordinatively unsaturated Cp*Ru(IPr)Cl (6) complex. Solution calorimetric results in this system provide information concerning the electron donor properties of the carbene ligand. Steric parameters associated with this ligand are determined from the X-ray crystal structure study. The carbene ligand reacts with RuCl2(=C(H)Ph)(PCy3)(2) (1) to yield a mixed carbene-phosphine ruthenium complex RuCl2(=C(H)Ph)(IPr)(PCy3) (9). A single-crystal X-ray diffraction study has been performed on 9. The thermal stability of 9 has been studied at 60 degrees C and its catalytic activity has been evaluated for the ring closing metathesis of diethyldiallylmalonate. (C) 2000 Elsevier Science S.A. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 49-54 |
| Number of pages | 6 |
| Journal | Journal of Organometallic Chemistry |
| Volume | 606 |
| Issue number | 1 |
| Publication status | Published - 14 Jul 2000 |
Keywords
- nucleophilic carbene
- thermochemistry
- olefin metathesis
- STRAIN CYCLIC OLEFINS
- IMIDAZOLIN-2-YLIDENE LIGANDS
- COMPLEXES
- POLYMERIZATION
- MOIETY
- RUCL2(=CHR')(PR(3))(2)
- NORBORNENE
- ROMP